• county
  • FIPS 08001
  • Largest town: Thornton

Adams County, Colorado

Adams County had 542,973 residents in the Census Vintage 2024 estimate, on 1,166.8 square miles of land. It ranks 5th of 64 in Colorado by population and 39th by land area.

Population
542,973
#5 of 64 in Colorado · #132 in US
Area
1,166.8 sq mi
#39 of 64 in Colorado · #527 in US
Density
465 / sq mi
#6 of 64 in Colorado · #296 in US
Median household income
$95,278
#14 of 64 in Colorado · #179 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Adams County within Colorado. Pin: Denver.

Measure from here

Tools and pages that start from Adams County

Adams County population, land area and income

Adams County had 542,973 residents in the Census Vintage 2024 estimate, on 1,166.8 square miles of land. It ranks 5th of 64 in Colorado by population and 39th by land area. That works out to 465.4 people per square mile, 4.8 times the US average of 96.3, and in the top tenth nationally.

The median county-equivalent in Colorado has 15,336 residents, so Adams County is 35.4 times that size.

Its SAIPE 2023 median household income of $95,278 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

542,973

3144th1st

132nd of 3,144 (US)

Land area

1,167 sq mi

3144th1st

527th of 3,144 (US)

Density

465.4 / sq mi

3144th1st

296th of 3,144 (US)

Median household income

$95,278

3143rd1st

179th of 3,143 (US)

Rank within Colorado (64)

Population

542,973

64th1st

5th of 64 (CO)

Land area

1,167 sq mi

64th1st

39th of 64 (CO)

Density

465.4 / sq mi

64th1st

6th of 64 (CO)

Median household income

$95,278

64th1st

14th of 64 (CO)

How Adams County's population changed since 2020

Adams County gained 22,456 residents between the July 2020 and July 2024 estimates, a rise of 4.3%. That ranks 16th of 64 in Colorado for growth. The median Colorado county changed by +1.7%, and the state as a whole by +2.9%.

Since the April 2020 estimates base, Adams County recorded 28,037 births and 16,275 deaths, a natural change of +11,762. Net international migration added +8,751 and net domestic migration, people moving to or from other US counties, came to +2,457. The largest single component was natural change, which added 11,762 people.

520.5k2020523.6k2021528.4k2022535.7k2023543.0k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
28,037
Deaths
16,275
Net international migration
+8,751
Net domestic migration
+2,457
Change, July 2023 to July 2024
+7,296

Where Adams County is

The Census internal point of Adams County is at 39.874300, -104.331900. It sits in UTM zone 13N. The map shades Colorado's 64 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Adams County outlined. Dots are towns of 1,000+ people with residents in it.

Otero County: -3.6%Lake County: -0.6%Adams County: +4.3%Kit Carson County: +0.2%Phillips County: -0.9%Bent County: +5.5%Lincoln County: -1.1%Washington County: -0.9%Hinsdale County: -5.1%Alamosa County: +1.9%Kiowa County: -4.1%Arapahoe County: +1.8%Archuleta County: +5.1%Montrose County: +4.6%Jefferson County: -0.8%Gilpin County: +2.5%Larimer County: +4.1%Custer County: +17.5%Saguache County: +4.3%Mineral County: +7.1%Broomfield County: +5.1%Logan County: -2.1%Mesa County: +3.4%Eagle County: -2.4%Denver County: +1.6%Pitkin County: -4.2%Boulder County: -0.2%El Paso County: +2.6%Las Animas County: +0.1%San Miguel County: -2.9%Douglas County: +9.3%Cheyenne County: -1.9%Garfield County: +2.2%Ouray County: +6.5%San Juan County: +16.0%Yuma County: +0.8%Elbert County: +12.1%Prowers County: -0.5%Morgan County: +4.2%Delta County: +3.7%Chaffee County: +6.6%Huerfano County: +2.4%Teller County: +0.5%Costilla County: +5.3%Baca County: -3.3%Routt County: +1.6%Conejos County: +1.3%Summit County: -1.1%Clear Creek County: -3.0%Fremont County: +2.5%Rio Blanco County: +1.3%Dolores County: +5.8%Grand County: +2.6%Gunnison County: +2.1%Park County: +5.1%Sedgwick County: -5.5%Montezuma County: +3.7%La Plata County: +2.1%Moffat County: -1.0%Rio Grande County: -3.6%Weld County: +11.5%Pueblo County: +0.9%Jackson County: -7.6%Crowley County: -1.5%
Change 2020 to 2024
  1. < -1.9%
  2. < +0.5%
  3. < +2.4%
  4. < +5.1%
  5. ≥ +5.1%
no data

Orange pin: Adams County internal point. Dark pin: Denver.

Internal point

Decimal
39.874300, -104.331900
DMS
39°52'27.48"N 104°19'54.84"W
UTM
13N 557133.5E 4414019.5N
Geohash
9xjfcfgud
Plus code
85FQVMF9+P6

Towns in Adams County

9 incorporated places of 1,000+ people have residents in Adams County, 445,600 people together, or 82% of the county. Each figure counts only the part of the town inside Adams County; towns marked "part" extend into another county. The largest is Thornton with 146,689.

  1. 01Thornton146,689
  2. 02Commerce City70,245
  3. 03Westminster (part)69,508
  4. 04Aurora (part)57,648
  5. 05Brighton (part)43,014
  6. 06Northglenn (part)38,262
  7. 07Federal Heights13,971
  8. 08Bennett (part)3,482
  9. 09Arvada (part)2,781
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Adams County

The Census 2024 county adjacency file lists 7 neighbors for Adams County. The most populous is Denver County, CO, with 729,019 residents. Distances run between Census internal points in a straight line.

Distance to Denver and the nearest big city

Denver is 35.9 miles WSW of Adams County's internal point in a straight line. The nearest place of 100,000 or more is Aurora, CO (population 403,130), 23.5 miles away.

Adams County FIPS code

The FIPS code of Adams County is 08001: state code 08 for Colorado plus county code 001. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $95,278.

Questions people ask

What is the population of Adams County, Colorado?

The Census Vintage 2024 estimate for July 1, 2024 is 542,973. That is up 22,456 people (4.3%) from the July 2020 estimate of 520,517.

What is the FIPS code of Adams County?

08001. The first two digits (08) are Colorado; the last three (001) identify the county.

What is the largest town in Adams County?

Thornton, with 146,689 residents inside Adams County in 2024.

Which counties border Adams County?

7 county-equivalents border it in the Census 2024 adjacency file: Denver County, CO; Arapahoe County, CO; Jefferson County, CO; Weld County, CO; Broomfield County, CO; Morgan County, CO; Washington County, CO.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.