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What are the fastest-growing counties in Colorado?

Custer County (+18.3%), Elbert County (+16.5%) and Weld County (+14.2%) grew fastest in Colorado between 2020 and 2025.

Colorado as a whole grew 3.9% between 2020 and 2025, to 6,012,561 residents.

Data as of 2025 · updated

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All 64 Colorado counties ranked

Colorado counties by population growth
RankCountyResidents 2025Change 2020–25Net migration per 1,000, 2025New homes per 1,000, 2025
1Custer County5,590+18.3%2.714.0
2Elbert County30,534+16.5%37.910.9
3Weld County378,426+14.2%10.27.9
4Douglas County399,396+10.8%8.36.0
5Ouray County5,265+7.9%17.714.4
6Chaffee County20,831+6.9%2.68.4
7Adams County554,668+6.6%0.74.7
8Archuleta County14,306+6.6%13.88.7
9Broomfield County79,174+6.3%3.612.3
10Dolores County2,466+5.8%10.50.0
11Saguache County6,732+5.3%8.010.4
12Costilla County3,679+5.1%11.131.0
13Park County18,314+5.1%−3.48.3
14Larimer County377,292+4.8%5.46.5
15Grand County16,496+4.7%6.418.9
16Bent County5,716+4.5%1.40.2
17Gilpin County6,073+4.4%16.63.6
18Mesa County162,845+4.4%10.15.0
19Morgan County30,306+4.2%−8.21.8
20Montrose County44,591+4.1%0.36.3
21Delta County32,178+3.6%−0.01.8
22Denver County740,613+3.2%−10.86.4
23El Paso County757,040+3.2%0.27.5
24Montezuma County26,678+3.0%1.80.9
25Gunnison County17,439+2.9%−1.87.9
26Arapahoe County673,820+2.8%−14.65.3
27Huerfano County7,011+2.7%15.46.7
28Garfield County63,474+2.7%−12.14.6
29Rio Blanco County6,683+2.5%−17.12.2
30Fremont County50,039+2.4%6.62.1
31La Plata County56,898+2.2%−0.46.6
32Routt County25,329+2.0%−11.48.6
33Lake County7,552+1.9%3.46.1
34Alamosa County16,688+1.9%−0.93.4
35Conejos County7,529+1.0%1.62.7
36Summit County31,517+0.9%−14.210.1
37Pueblo County169,277+0.6%−3.81.3
38Kit Carson County7,069+0.1%4.20.6
39Teller County24,756+0.0%1.34.8
40Lincoln County5,645−0.4%8.11.8
41Jefferson County580,451−0.5%−3.31.9
42Crowley County5,677−0.5%9.20.0
43Las Animas County14,391−0.7%−3.42.1
44Boulder County328,560−0.7%−6.86.1
45Yuma County9,896−0.8%−7.50.4
46Prowers County11,884−1.1%−5.61.3
47Moffat County13,122−1.1%−17.01.8
48Washington County4,732−1.6%−3.00.6
49Cheyenne County1,713−1.9%14.62.3
50Phillips County4,420−2.4%−11.11.4
51Eagle County54,291−2.5%−12.24.1
52Logan County20,654−2.7%0.50.2
53Kiowa County1,412−2.8%3.55.0
54San Miguel County7,753−3.7%−13.36.6
55Baca County3,347−3.8%−9.90.6
56Clear Creek County8,994−3.9%−1.72.3
57Rio Grande County11,087−3.9%−2.33.8
58Pitkin County16,625−4.3%−11.92.2
59Otero County17,683−5.2%−6.70.5
60Sedgwick County2,247−6.0%−2.20.0
61Jackson County1,211−12.2%−52.81.7
–Hinsdale County753–––
–Mineral County910–––
–San Juan County813–––

Ranked by the change in Census Bureau population estimates, 2020–2025. 3 counties are listed last and not ranked: fewer than 1,000 residents, or no estimate for the same years.

Statewide totals

More county rankings for Colorado

Metro areas

Fastest-growing metro areas in the U.S.

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Questions

Is Colorado growing?

Colorado as a whole grew 3.9% between 2020 and 2025, to 6,012,561 residents. Statewide figures add up its counties.

What is the fastest-growing county in Colorado?

Custer County, which grew 18.3% between 2020 and 2025 to 5,590 residents (Census Bureau population estimates). Elbert County (+16.5%) and Weld County (+14.2%) came next.

Which Colorado counties are losing population?

22 of the 61 ranked counties had fewer residents in 2025 than in 2020. The steepest declines: Jackson County (−12.2%), Sedgwick County (−6.0%), Otero County (−5.2%).

Where are people moving in Colorado?

For their size, Elbert County (37.9 per 1,000 residents), Ouray County (17.7 per 1,000 residents) and Gilpin County (16.6 per 1,000 residents) drew the most net domestic migration (people moving in from other U.S. counties minus people moving out) in 2025.

Fastest-growing counties in other states

Across the U.S.

Sources and method

Each number shows its own period. Changes compare the latest period with five years earlier (or the earliest period available). Beacon CRE last refreshed these figures on 2026-11-05. Figures come from public federal statistics and are informational only, not investment advice. Check the source before relying on a number. Methodology: how we compute every number. More on every layer: data sources and licences.