• county
  • FIPS 08003
  • Largest town: Alamosa

Alamosa County, Colorado

Alamosa County had 16,689 residents in the Census Vintage 2024 estimate, on 722.7 square miles of land. It ranks 30th of 64 in Colorado by population and 53rd by land area.

Population
16,689
#30 of 64 in Colorado · #1,993 in US
Area
722.7 sq mi
#53 of 64 in Colorado · #1,232 in US
Density
23 / sq mi
#21 of 64 in Colorado · #2,128 in US
Median household income
$50,056
#56 of 64 in Colorado · #2,716 in US

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

Alamosa County within Colorado. Pin: Denver.

Measure from here

Tools and pages that start from Alamosa County

Alamosa County population, land area and income

Alamosa County had 16,689 residents in the Census Vintage 2024 estimate, on 722.7 square miles of land. It ranks 30th of 64 in Colorado by population and 53rd by land area. That works out to 23.1 people per square mile, below the US average of 96.3, and below the national county median.

The median county-equivalent in Colorado has 15,336 residents, about the same as Alamosa County.

Its SAIPE 2023 median household income of $50,056 is in the bottom quarter among 3,143 counties with an estimate.

National rank among 3,144

Population

16,689

3144th1st

1993rd of 3,144 (US)

Land area

723 sq mi

3144th1st

1232nd of 3,144 (US)

Density

23.1 / sq mi

3144th1st

2128th of 3,144 (US)

Median household income

$50,056

3143rd1st

2716th of 3,143 (US)

Rank within Colorado (64)

Population

16,689

64th1st

30th of 64 (CO)

Land area

723 sq mi

64th1st

53rd of 64 (CO)

Density

23.1 / sq mi

64th1st

21st of 64 (CO)

Median household income

$50,056

64th1st

56th of 64 (CO)

How Alamosa County's population changed since 2020

Alamosa County gained 314 residents between the July 2020 and July 2024 estimates, a rise of 1.9%. That ranks 31st 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, Alamosa County recorded 841 births and 742 deaths, a natural change of +99. Net international migration added +74 and net domestic migration, people moving to or from other US counties, came to +139. The largest single component was domestic migration, which added 139 people.

16.4k202016.6k202116.6k202216.7k202316.7k2024
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
841
Deaths
742
Net international migration
+74
Net domestic migration
+139
Change, July 2023 to July 2024
+21

Where Alamosa County is

The Census internal point of Alamosa County is at 37.568400, -105.788000. 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 Alamosa 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: Alamosa County internal point. Dark pin: Denver.

Internal point

Decimal
37.568400, -105.788000
DMS
37°34'6.24"N 105°47'16.80"W
UTM
13N 430411.6E 4158221.6N
Geohash
9wsv8xpeb
Plus code
859PH696+9Q

Towns in Alamosa County

One incorporated place of 1,000+ people has residents in Alamosa County, 9,906 people together, or 59% of the county. Each figure counts only the part of the town inside Alamosa County; towns marked "part" extend into another county. The largest is Alamosa with 9,906.

  1. 01Alamosa9,906
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Alamosa County

The Census 2024 county adjacency file lists 5 neighbors for Alamosa County. The most populous is Rio Grande County, CO, with 11,132 residents. Distances run between Census internal points in a straight line.

Distance to Denver and the nearest big city

Denver is 156.1 miles NNE of Alamosa County's internal point in a straight line. The nearest place of 100,000 or more is Pueblo, CO (population 111,166), 80.4 miles away. The nearest place of 10,000 or more is Cañon City, CO (population 17,193), 67.8 miles away.

Alamosa County FIPS code

The FIPS code of Alamosa County is 08003: state code 08 for Colorado plus county code 003. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $50,056.

Questions people ask

What is the population of Alamosa County, Colorado?

The Census Vintage 2024 estimate for July 1, 2024 is 16,689. That is up 314 people (1.9%) from the July 2020 estimate of 16,375.

What is the FIPS code of Alamosa County?

08003. The first two digits (08) are Colorado; the last three (003) identify the county.

What is the largest town in Alamosa County?

Alamosa, with 9,906 residents inside Alamosa County in 2024.

Which counties border Alamosa County?

5 county-equivalents border it in the Census 2024 adjacency file: Rio Grande County, CO; Conejos County, CO; Huerfano County, CO; Saguache County, CO; Costilla 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.