Fastest-Growing U.S. Counties 2026: Top 100 by 2020–2025 Population Growth
U.S. County Population Growth: 2026 Census Snapshot
Kaufman County, Texas ranks first, with its July 1 population estimate rising from 147,165 in 2020 to 209,235 in 2025. That equals 42.2% cumulative growth. The ranking uses U.S. Census Bureau Population Estimates Program Vintage 2025 data and measures 2020–2025 change, not one-year 2024–2025 growth and not a 2026 forecast.
The ranking is calculated from U.S. Census Bureau Population Estimates Program Vintage 2025 county estimates. County Maps US is used only as an external cross-check and does not determine the values or rank order.
Coverage: 100 counties and county-equivalents in the 50 states and District of Columbia after applying a July 1, 2025 population threshold of POPESTIMATE2025 ≥ 10,000. Unit: percent change. Direction: higher raw percentage ranks higher. Status counts: 100 calculated_value, 0 official_value, 0 official_forecast, 0 modeled_projection.
Each percentage is calculated from official observed Census inputs with ((POPESTIMATE2025 − POPESTIMATE2020) / POPESTIMATE2020) × 100. Rank uses the unrounded result; display values are rounded to one decimal.
Kaufman County, Texas · 147,165 in 2020 → 209,235 in 2025.
Lincoln County, Montana ranks No. 100 at 13.1% displayed growth.
Eligible counties and county-equivalents with POPESTIMATE2025 ≥ 10,000.
Cumulative percent population change within one Census Vintage 2025 estimate series.
Official Census inputs; calculated percentages; no forecasts or modeled projections.
Overview: how this county growth ranking works
This ranking compares the July 1, 2020 and July 1, 2025 resident population estimates from the same Census Vintage 2025 series. A value of 20.0% means the 2025 estimate is about one-fifth higher than the county's 2020 estimate.
Percentage growth is not the same as absolute population gain. A smaller county can rank above a larger county even when it added fewer residents because the denominator is its own 2020 population. To limit very small-base effects, StatRanker includes only entries with a July 1, 2025 population estimate of at least 10,000.
Ranking rule: raw calculated percentages are sorted from highest to lowest. Rounding to one decimal is used only for display. A tie-break is needed only if full raw percentages are exactly equal.
Top 10 U.S. counties by cumulative population growth, 2020–2025
Kaufman County leads at 42.2%, followed by Long County, Georgia at 32.6% and Jasper County, South Carolina at 32.2%. All three values are calculated from official Vintage 2025 Census population estimates.
Top 10 by raw calculated 2020–2025 percentage growth
| Rank | Entity | Growth | Source / method |
|---|---|---|---|
| 1 | Kaufman County, Texas | 42.2% | South · calculated_value · Census V2025 · 147,165 (2020) → 209,235 (2025) · formula: (2025−2020)/2020 ×100. |
| 2 | Long County, Georgia | 32.6% | South · calculated_value · Census V2025 · 16,256 (2020) → 21,557 (2025) · formula: (2025−2020)/2020 ×100. |
| 3 | Jasper County, South Carolina | 32.2% | South · calculated_value · Census V2025 · 29,158 (2020) → 38,533 (2025) · formula: (2025−2020)/2020 ×100. |
| 4 | Liberty County, Texas | 31.2% | South · calculated_value · Census V2025 · 92,471 (2020) → 121,364 (2025) · formula: (2025−2020)/2020 ×100. |
| 5 | Dawson County, Georgia | 30.7% | South · calculated_value · Census V2025 · 27,062 (2020) → 35,365 (2025) · formula: (2025−2020)/2020 ×100. |
| 6 | Jackson County, Georgia | 29.3% | South · calculated_value · Census V2025 · 76,765 (2020) → 99,265 (2025) · formula: (2025−2020)/2020 ×100. |
| 7 | Rockwall County, Texas | 28.9% | South · calculated_value · Census V2025 · 109,199 (2020) → 140,738 (2025) · formula: (2025−2020)/2020 ×100. |
| 8 | Comal County, Texas | 27.8% | South · calculated_value · Census V2025 · 163,608 (2020) → 209,166 (2025) · formula: (2025−2020)/2020 ×100. |
| 9 | Brunswick County, North Carolina | 26.5% | South · calculated_value · Census V2025 · 138,135 (2020) → 174,702 (2025) · formula: (2025−2020)/2020 ×100. |
| 10 | Pinal County, Arizona | 25.4% | West · calculated_value · Census V2025 · 430,231 (2020) → 539,380 (2025) · formula: (2025−2020)/2020 ×100. |
Visible percentages are rounded to one decimal. Rank is determined from the unrounded calculated percentage stored in each row's raw data-value.
Chart: Top 20 counties by 2020–2025 population growth
The chart follows the same raw rank order as the table while displaying percentages to one decimal.
Methodology
The metric is cumulative percentage change in county resident population between July 1, 2020 and July 1, 2025 using U.S. Census Bureau Population Estimates Program Vintage 2025. The article is a 2026 publication snapshot; the target year of the observed population estimate is 2025.
Metric, unit and direction
Metric: cumulative 2020–2025 resident population growth. Unit: percent. Direction: descending; a larger raw percentage ranks higher.
Calculation
Formula: ((POPESTIMATE2025 − POPESTIMATE2020) / POPESTIMATE2020) × 100. Rank uses the full unrounded result. Display values are rounded to one decimal.
Value status
All 100 rows are calculated_value. Census publishes the population inputs; StatRanker calculates the percentage. These are observed-input calculations, not forecasts or projections.
Eligibility
StatRanker applies POPESTIMATE2025 ≥ 10,000, making the population floor and its reference year explicit. Puerto Rico municipios and island-area equivalents are outside the ranking universe.
Rank and ties
Rows are ranked by full raw percentage before rounding. Only an exact raw tie would require a deterministic secondary key; equal one-decimal display values alone do not create a tie.
Source hierarchy
U.S. Census Bureau PEP Vintage 2025 is the numeric authority. County Maps US is used only as an external cross-check of county names and one-decimal display values; it does not select the Top 100 or supply the final raw rank.
Inclusion requires official POPESTIMATE2020 and POPESTIMATE2025 inputs from the same Vintage 2025 series, a reproducible formula, source year, target year, status and method note. Missing values are not imputed, and conflicts are not averaged. The Census series takes priority.
The metric does not measure one-year 2024–2025 growth, absolute population gain, migration alone, births minus deaths, housing construction, economic growth or a 2026 population forecast. The Census Bureau separately publishes annual 2024–2025 county change; that is a different metric.
The numeric ranking is a single-source research dataset calculated from U.S. Census Bureau Vintage 2025 inputs. County Maps US is retained only as an external cross-check.
Main ranking: Top 100 fastest-growing U.S. counties, 2020–2025
Search by county or state, filter by Census region or data status, sort the existing rows, or switch between Top 10, Top 20 and all 100 entries.
Top 100 eligible counties and county-equivalents by raw calculated 2020–2025 population growth
| Rank | Entity | Growth | Source / method |
|---|---|---|---|
| 1 | Kaufman County, Texas | 42.2% | South · calculated_value · Census V2025 · 147,165 (2020) → 209,235 (2025) · formula: (2025−2020)/2020 ×100. |
| 2 | Long County, Georgia | 32.6% | South · calculated_value · Census V2025 · 16,256 (2020) → 21,557 (2025) · formula: (2025−2020)/2020 ×100. |
| 3 | Jasper County, South Carolina | 32.2% | South · calculated_value · Census V2025 · 29,158 (2020) → 38,533 (2025) · formula: (2025−2020)/2020 ×100. |
| 4 | Liberty County, Texas | 31.2% | South · calculated_value · Census V2025 · 92,471 (2020) → 121,364 (2025) · formula: (2025−2020)/2020 ×100. |
| 5 | Dawson County, Georgia | 30.7% | South · calculated_value · Census V2025 · 27,062 (2020) → 35,365 (2025) · formula: (2025−2020)/2020 ×100. |
| 6 | Jackson County, Georgia | 29.3% | South · calculated_value · Census V2025 · 76,765 (2020) → 99,265 (2025) · formula: (2025−2020)/2020 ×100. |
| 7 | Rockwall County, Texas | 28.9% | South · calculated_value · Census V2025 · 109,199 (2020) → 140,738 (2025) · formula: (2025−2020)/2020 ×100. |
| 8 | Comal County, Texas | 27.8% | South · calculated_value · Census V2025 · 163,608 (2020) → 209,166 (2025) · formula: (2025−2020)/2020 ×100. |
| 9 | Brunswick County, North Carolina | 26.5% | South · calculated_value · Census V2025 · 138,135 (2020) → 174,702 (2025) · formula: (2025−2020)/2020 ×100. |
| 10 | Pinal County, Arizona | 25.4% | West · calculated_value · Census V2025 · 430,231 (2020) → 539,380 (2025) · formula: (2025−2020)/2020 ×100. |
| 11 | St. Johns County, Florida | 25.0% | South · calculated_value · Census V2025 · 277,119 (2020) → 346,328 (2025) · formula: (2025−2020)/2020 ×100. |
| 12 | Montgomery County, Texas | 24.9% | South · calculated_value · Census V2025 · 625,369 (2020) → 781,194 (2025) · formula: (2025−2020)/2020 ×100. |
| 13 | Hays County, Texas | 24.8% | South · calculated_value · Census V2025 · 243,984 (2020) → 304,390 (2025) · formula: (2025−2020)/2020 ×100. |
| 14 | Ellis County, Texas | 24.0% | South · calculated_value · Census V2025 · 194,322 (2020) → 240,867 (2025) · formula: (2025−2020)/2020 ×100. |
| 15 | Parker County, Texas | 23.5% | South · calculated_value · Census V2025 · 149,559 (2020) → 184,767 (2025) · formula: (2025−2020)/2020 ×100. |
| 16 | Osceola County, Florida | 23.2% | South · calculated_value · Census V2025 · 391,130 (2020) → 481,718 (2025) · formula: (2025−2020)/2020 ×100. |
| 17 | Hunt County, Texas | 23.0% | South · calculated_value · Census V2025 · 100,260 (2020) → 123,336 (2025) · formula: (2025−2020)/2020 ×100. |
| 18 | Walton County, Florida | 22.9% | South · calculated_value · Census V2025 · 75,899 (2020) → 93,288 (2025) · formula: (2025−2020)/2020 ×100. |
| 19 | Chambers County, Texas | 22.6% | South · calculated_value · Census V2025 · 46,992 (2020) → 57,594 (2025) · formula: (2025−2020)/2020 ×100. |
| 20 | Williamson County, Texas | 22.3% | South · calculated_value · Census V2025 · 615,611 (2020) → 752,827 (2025) · formula: (2025−2020)/2020 ×100. |
| 21 | Waller County, Texas | 21.9% | South · calculated_value · Census V2025 · 57,294 (2020) → 69,858 (2025) · formula: (2025−2020)/2020 ×100. |
| 22 | Wise County, Texas | 21.5% | South · calculated_value · Census V2025 · 68,931 (2020) → 83,778 (2025) · formula: (2025−2020)/2020 ×100. |
| 23 | Hendry County, Florida | 21.5% | South · calculated_value · Census V2025 · 39,726 (2020) → 48,276 (2025) · formula: (2025−2020)/2020 ×100. |
| 24 | St. Lucie County, Florida | 21.4% | South · calculated_value · Census V2025 · 331,453 (2020) → 402,449 (2025) · formula: (2025−2020)/2020 ×100. |
| 25 | Bastrop County, Texas | 21.3% | South · calculated_value · Census V2025 · 98,060 (2020) → 118,908 (2025) · formula: (2025−2020)/2020 ×100. |
| 26 | New Kent County, Virginia | 21.2% | South · calculated_value · Census V2025 · 23,118 (2020) → 28,022 (2025) · formula: (2025−2020)/2020 ×100. |
| 27 | Sumter County, Florida | 21.1% | South · calculated_value · Census V2025 · 130,293 (2020) → 157,772 (2025) · formula: (2025−2020)/2020 ×100. |
| 28 | Flagler County, Florida | 21.0% | South · calculated_value · Census V2025 · 116,031 (2020) → 140,360 (2025) · formula: (2025−2020)/2020 ×100. |
| 29 | Horry County, South Carolina | 20.9% | South · calculated_value · Census V2025 · 353,774 (2020) → 427,551 (2025) · formula: (2025−2020)/2020 ×100. |
| 30 | Collin County, Texas | 20.6% | South · calculated_value · Census V2025 · 1,075,512 (2020) → 1,297,179 (2025) · formula: (2025−2020)/2020 ×100. |
| 31 | Johnson County, Texas | 20.5% | South · calculated_value · Census V2025 · 180,955 (2020) → 218,048 (2025) · formula: (2025−2020)/2020 ×100. |
| 32 | Canadian County, Oklahoma | 20.4% | South · calculated_value · Census V2025 · 155,435 (2020) → 187,189 (2025) · formula: (2025−2020)/2020 ×100. |
| 33 | Jasper County, Georgia | 20.2% | South · calculated_value · Census V2025 · 14,671 (2020) → 17,632 (2025) · formula: (2025−2020)/2020 ×100. |
| 34 | Caldwell County, Texas | 20.0% | South · calculated_value · Census V2025 · 45,945 (2020) → 55,150 (2025) · formula: (2025−2020)/2020 ×100. |
| 35 | Polk County, Florida | 19.8% | South · calculated_value · Census V2025 · 730,148 (2020) → 874,790 (2025) · formula: (2025−2020)/2020 ×100. |
| 36 | Kendall County, Texas | 19.6% | South · calculated_value · Census V2025 · 44,568 (2020) → 53,289 (2025) · formula: (2025−2020)/2020 ×100. |
| 37 | Tooele County, Utah | 19.2% | West · calculated_value · Census V2025 · 73,349 (2020) → 87,461 (2025) · formula: (2025−2020)/2020 ×100. |
| 38 | Pasco County, Florida | 19.1% | South · calculated_value · Census V2025 · 566,170 (2020) → 674,516 (2025) · formula: (2025−2020)/2020 ×100. |
| 39 | Pender County, North Carolina | 19.0% | South · calculated_value · Census V2025 · 60,614 (2020) → 72,111 (2025) · formula: (2025−2020)/2020 ×100. |
| 40 | Franklin County, North Carolina | 18.8% | South · calculated_value · Census V2025 · 69,029 (2020) → 82,037 (2025) · formula: (2025−2020)/2020 ×100. |
| 41 | Barrow County, Georgia | 18.7% | South · calculated_value · Census V2025 · 84,066 (2020) → 99,773 (2025) · formula: (2025−2020)/2020 ×100. |
| 42 | Berkeley County, South Carolina | 18.7% | South · calculated_value · Census V2025 · 231,478 (2020) → 274,666 (2025) · formula: (2025−2020)/2020 ×100. |
| 43 | Blanco County, Texas | 18.6% | South · calculated_value · Census V2025 · 11,451 (2020) → 13,581 (2025) · formula: (2025−2020)/2020 ×100. |
| 44 | McClain County, Oklahoma | 18.4% | South · calculated_value · Census V2025 · 41,922 (2020) → 49,647 (2025) · formula: (2025−2020)/2020 ×100. |
| 45 | Lancaster County, South Carolina | 18.3% | South · calculated_value · Census V2025 · 96,589 (2020) → 114,296 (2025) · formula: (2025−2020)/2020 ×100. |
| 46 | Lake County, Florida | 18.1% | South · calculated_value · Census V2025 · 386,221 (2020) → 456,068 (2025) · formula: (2025−2020)/2020 ×100. |
| 47 | Canyon County, Idaho | 18.1% | West · calculated_value · Census V2025 · 233,001 (2020) → 275,123 (2025) · formula: (2025−2020)/2020 ×100. |
| 48 | Limestone County, Alabama | 18.0% | South · calculated_value · Census V2025 · 104,193 (2020) → 122,928 (2025) · formula: (2025−2020)/2020 ×100. |
| 49 | Johnston County, North Carolina | 17.9% | South · calculated_value · Census V2025 · 217,450 (2020) → 256,448 (2025) · formula: (2025−2020)/2020 ×100. |
| 50 | Dallas County, Iowa | 17.8% | Midwest · calculated_value · Census V2025 · 100,521 (2020) → 118,457 (2025) · formula: (2025−2020)/2020 ×100. |
| 51 | Wilson County, Tennessee | 17.7% | South · calculated_value · Census V2025 · 148,654 (2020) → 175,033 (2025) · formula: (2025−2020)/2020 ×100. |
| 52 | Lincoln County, South Dakota | 17.5% | Midwest · calculated_value · Census V2025 · 65,650 (2020) → 77,145 (2025) · formula: (2025−2020)/2020 ×100. |
| 53 | Fort Bend County, Texas | 17.4% | South · calculated_value · Census V2025 · 830,347 (2020) → 975,191 (2025) · formula: (2025−2020)/2020 ×100. |
| 54 | Washington County, Utah | 17.4% | West · calculated_value · Census V2025 · 182,002 (2020) → 213,670 (2025) · formula: (2025−2020)/2020 ×100. |
| 55 | Nassau County, Florida | 17.4% | South · calculated_value · Census V2025 · 91,040 (2020) → 106,879 (2025) · formula: (2025−2020)/2020 ×100. |
| 56 | Goochland County, Virginia | 17.4% | South · calculated_value · Census V2025 · 24,866 (2020) → 29,187 (2025) · formula: (2025−2020)/2020 ×100. |
| 57 | Banks County, Georgia | 17.3% | South · calculated_value · Census V2025 · 18,129 (2020) → 21,273 (2025) · formula: (2025−2020)/2020 ×100. |
| 58 | Marion County, Florida | 17.3% | South · calculated_value · Census V2025 · 377,432 (2020) → 442,660 (2025) · formula: (2025−2020)/2020 ×100. |
| 59 | Bay County, Florida | 17.1% | South · calculated_value · Census V2025 · 174,551 (2020) → 204,479 (2025) · formula: (2025−2020)/2020 ×100. |
| 60 | Denton County, Texas | 16.9% | South · calculated_value · Census V2025 · 914,517 (2020) → 1,069,346 (2025) · formula: (2025−2020)/2020 ×100. |
| 61 | Currituck County, North Carolina | 16.7% | South · calculated_value · Census V2025 · 28,405 (2020) → 33,158 (2025) · formula: (2025−2020)/2020 ×100. |
| 62 | Manatee County, Florida | 16.6% | South · calculated_value · Census V2025 · 401,622 (2020) → 468,200 (2025) · formula: (2025−2020)/2020 ×100. |
| 63 | Elbert County, Colorado | 16.5% | West · calculated_value · Census V2025 · 26,211 (2020) → 30,534 (2025) · formula: (2025−2020)/2020 ×100. |
| 64 | Union County, Ohio | 16.5% | Midwest · calculated_value · Census V2025 · 63,069 (2020) → 73,446 (2025) · formula: (2025−2020)/2020 ×100. |
| 65 | Iron County, Utah | 16.4% | West · calculated_value · Census V2025 · 57,703 (2020) → 67,141 (2025) · formula: (2025−2020)/2020 ×100. |
| 66 | Grimes County, Texas | 16.3% | South · calculated_value · Census V2025 · 29,443 (2020) → 34,252 (2025) · formula: (2025−2020)/2020 ×100. |
| 67 | Burleson County, Texas | 16.2% | South · calculated_value · Census V2025 · 17,679 (2020) → 20,549 (2025) · formula: (2025−2020)/2020 ×100. |
| 68 | Sussex County, Delaware | 16.1% | South · calculated_value · Census V2025 · 238,627 (2020) → 277,140 (2025) · formula: (2025−2020)/2020 ×100. |
| 69 | Edgefield County, South Carolina | 16.1% | South · calculated_value · Census V2025 · 25,674 (2020) → 29,808 (2025) · formula: (2025−2020)/2020 ×100. |
| 70 | Walton County, Georgia | 16.0% | South · calculated_value · Census V2025 · 97,115 (2020) → 112,696 (2025) · formula: (2025−2020)/2020 ×100. |
| 71 | Benton County, Arkansas | 16.0% | South · calculated_value · Census V2025 · 286,597 (2020) → 332,554 (2025) · formula: (2025−2020)/2020 ×100. |
| 72 | Maury County, Tennessee | 16.0% | South · calculated_value · Census V2025 · 101,812 (2020) → 118,131 (2025) · formula: (2025−2020)/2020 ×100. |
| 73 | Madison County, Montana | 15.8% | West · calculated_value · Census V2025 · 8,657 (2020) → 10,026 (2025) · formula: (2025−2020)/2020 ×100. |
| 74 | Guadalupe County, Texas | 15.8% | South · calculated_value · Census V2025 · 173,722 (2020) → 201,111 (2025) · formula: (2025−2020)/2020 ×100. |
| 75 | Spartanburg County, South Carolina | 15.6% | South · calculated_value · Census V2025 · 329,370 (2020) → 380,857 (2025) · formula: (2025−2020)/2020 ×100. |
| 76 | Loudon County, Tennessee | 15.6% | South · calculated_value · Census V2025 · 55,144 (2020) → 63,764 (2025) · formula: (2025−2020)/2020 ×100. |
| 77 | Bryan County, Georgia | 15.6% | South · calculated_value · Census V2025 · 45,048 (2020) → 52,062 (2025) · formula: (2025−2020)/2020 ×100. |
| 78 | Charlotte County, Florida | 15.5% | South · calculated_value · Census V2025 · 188,023 (2020) → 217,212 (2025) · formula: (2025−2020)/2020 ×100. |
| 79 | Boundary County, Idaho | 15.3% | West · calculated_value · Census V2025 · 12,141 (2020) → 13,997 (2025) · formula: (2025−2020)/2020 ×100. |
| 80 | Burnet County, Texas | 15.2% | South · calculated_value · Census V2025 · 49,480 (2020) → 57,015 (2025) · formula: (2025−2020)/2020 ×100. |
| 81 | Baldwin County, Alabama | 14.8% | South · calculated_value · Census V2025 · 233,252 (2020) → 267,761 (2025) · formula: (2025−2020)/2020 ×100. |
| 82 | Bonner County, Idaho | 14.8% | West · calculated_value · Census V2025 · 47,411 (2020) → 54,420 (2025) · formula: (2025−2020)/2020 ×100. |
| 83 | Juab County, Utah | 14.8% | West · calculated_value · Census V2025 · 11,821 (2020) → 13,567 (2025) · formula: (2025−2020)/2020 ×100. |
| 84 | Wagoner County, Oklahoma | 14.6% | South · calculated_value · Census V2025 · 81,390 (2020) → 93,263 (2025) · formula: (2025−2020)/2020 ×100. |
| 85 | Gilchrist County, Florida | 14.5% | South · calculated_value · Census V2025 · 17,890 (2020) → 20,488 (2025) · formula: (2025−2020)/2020 ×100. |
| 86 | Utah County, Utah | 14.5% | West · calculated_value · Census V2025 · 663,576 (2020) → 759,859 (2025) · formula: (2025−2020)/2020 ×100. |
| 87 | Lee County, Florida | 14.4% | South · calculated_value · Census V2025 · 765,575 (2020) → 875,607 (2025) · formula: (2025−2020)/2020 ×100. |
| 88 | Weld County, Colorado | 14.2% | West · calculated_value · Census V2025 · 331,434 (2020) → 378,426 (2025) · formula: (2025−2020)/2020 ×100. |
| 89 | Effingham County, Georgia | 14.1% | South · calculated_value · Census V2025 · 65,180 (2020) → 74,397 (2025) · formula: (2025−2020)/2020 ×100. |
| 90 | Monroe County, Georgia | 14.1% | South · calculated_value · Census V2025 · 28,065 (2020) → 32,023 (2025) · formula: (2025−2020)/2020 ×100. |
| 91 | Lawrence County, South Dakota | 14.0% | Midwest · calculated_value · Census V2025 · 25,847 (2020) → 29,459 (2025) · formula: (2025−2020)/2020 ×100. |
| 92 | Berkeley County, West Virginia | 13.7% | South · calculated_value · Census V2025 · 122,693 (2020) → 139,522 (2025) · formula: (2025−2020)/2020 ×100. |
| 93 | Hood County, Texas | 13.6% | South · calculated_value · Census V2025 · 62,054 (2020) → 70,501 (2025) · formula: (2025−2020)/2020 ×100. |
| 94 | Louisa County, Virginia | 13.6% | South · calculated_value · Census V2025 · 37,785 (2020) → 42,924 (2025) · formula: (2025−2020)/2020 ×100. |
| 95 | Jefferson County, Idaho | 13.6% | West · calculated_value · Census V2025 · 31,080 (2020) → 35,297 (2025) · formula: (2025−2020)/2020 ×100. |
| 96 | Boone County, Indiana | 13.5% | Midwest · calculated_value · Census V2025 · 71,113 (2020) → 80,689 (2025) · formula: (2025−2020)/2020 ×100. |
| 97 | Hancock County, Indiana | 13.5% | Midwest · calculated_value · Census V2025 · 80,175 (2020) → 90,969 (2025) · formula: (2025−2020)/2020 ×100. |
| 98 | Hernando County, Florida | 13.3% | South · calculated_value · Census V2025 · 195,610 (2020) → 221,701 (2025) · formula: (2025−2020)/2020 ×100. |
| 99 | Lincoln County, North Carolina | 13.2% | South · calculated_value · Census V2025 · 87,153 (2020) → 98,654 (2025) · formula: (2025−2020)/2020 ×100. |
| 100 | Lincoln County, Montana | 13.1% | West · calculated_value · Census V2025 · 19,737 (2020) → 22,328 (2025) · formula: (2025−2020)/2020 ×100. |
Ranking uses full raw calculated percentages from Census Vintage 2025 inputs. Display percentages are rounded to one decimal only after rank assignment. County Maps US is an external cross-check, not the source of final rank order.
Insights from the Top 100 county growth ranking
Key Insight
Kaufman County grew 42.2%, 9.6 percentage points above Long County. It is the only entry in this Top 100 above 40%.
Notable Pattern
Texas contributes 26 of the 100 entries, Florida 18 and Georgia 10. Together they account for 54 of the displayed counties.
Regional Concentration
The Census South contains 80 entries, the West 14 and the Midwest 6. No Northeast county appears in this Top 100.
Outlier
The gap from No. 1 Kaufman County (42.2%) to No. 2 Long County (32.6%) is larger than any gap among the remaining Top 20 positions.
What this ranking means
Use this table to compare how much each eligible county's resident population estimate changed relative to its own 2020 base. It is a relative-growth ranking: a high percentage does not necessarily mean the county added the largest number of residents.
All percentages are calculated_value results. The Census Bureau publishes the underlying Vintage 2025 population estimates, while StatRanker applies the disclosed percentage-change formula and ranks the unrounded outputs.
For other population views, compare this county-growth table with StatRanker's one-year city growth ranking, state population ranking and metro population ranking. Those pages use different geographies or metrics and should not be merged into this county ranking.
FAQ
Which U.S. county grew the fastest from 2020 to 2025?
Kaufman County, Texas ranks first in this eligible Top 100. Its Vintage 2025 estimate rises from 147,165 in 2020 to 209,235 in 2025, equal to 42.2% cumulative growth.
Are these official Census growth percentages?
The population inputs are official U.S. Census Bureau Vintage 2025 estimates. The percentage values are calculated by StatRanker from those official inputs, so every row is classified as calculated_value rather than official_value.
Are these 2026 population figures?
No. The observed target year is 2025. “2026” describes the publication snapshot because the Census Bureau released Vintage 2025 county estimates in March 2026.
Is this the same as the latest one-year 2024–2025 county growth ranking?
No. This page measures cumulative growth from July 1, 2020 to July 1, 2025. Census also publishes annual 2024–2025 county change, which is a different metric and can produce a different order.
Why is there a 10,000-resident threshold?
The threshold reduces extreme percentage rankings driven by very small population bases. Eligibility is defined explicitly as POPESTIMATE2025 ≥ 10,000.
How are ranks calculated when two displayed values are the same?
Ranks use the full unrounded percentage, not the one-decimal display value. Two counties can therefore display the same rounded percentage while still having different raw values and ranks.
Does percentage growth show which counties added the most residents?
No. Percentage growth divides the change by each county's 2020 population. Absolute population gain is a different metric.
Does this ranking measure migration?
No. It measures total resident population change between two Census estimates. Natural change and migration contribute to population change, while later Census vintages can revise the estimate series.
Sources
U.S. Census Bureau — County Population Totals and Components of Change: 2020–2025
Primary official source page for Vintage 2025 county population totals. Census identifies Vintage 2025 as the most recent completed consistent estimate series.
https://www.census.gov/data/tables/time-series/demo/popest/2020s-counties-total.html
U.S. Census Bureau — CO-EST2025-ALLDATA CSV
Authoritative numeric input file used for POPESTIMATE2020 and POPESTIMATE2025.
U.S. Census Bureau — CO-EST2025-ALLDATA file layout
Defines POPESTIMATE2020 as the July 1, 2020 resident total population estimate and POPESTIMATE2025 as the July 1, 2025 estimate.
U.S. Census Bureau — 2024–2025 annual county change
Context source used to distinguish this cumulative 2020–2025 ranking from Census's separate latest one-year 2024–2025 growth measure.
https://www.census.gov/library/visualizations/2026/demo/percent-change-county-population.html
County Maps US — fastest-growing counties
Secondary cross-check only for county names and one-decimal display values. It is not used to select the Top 100 or assign StatRanker's final raw rank order.
