Costilla County , Colorado

Costilla County: County in Colorado, United States


Costilla County is a county located in the U.S. state of Colorado. As of the 2010 census, the population was 3,524 and a population density of 1 people per km². After 10 years in 2020 county had an estimated population of 3,921 inhabitants. Its county seat is San Luis. The county was created 160 years ago in 1861.

Costilla County Quick Facts

Population : 3,921 (2020)
Country : United States of America
State : Colorado (United States)
Area : 3187 km2
Water as percent of area : 0.3%
Land as percent of area : 99.7%
Altitude : 8,035 feet / 2449 meters
Capital : San Luis
Establishment : November 11, 1861
Time Zone : America/Denver
Local time : 13:52:01 (3rd December 2021)
Density : 1 Pop. per km² as of 2020
Population growth : 10.12% (2010-2020)
Weather : 27℉ Mostly Clear 7-days weather
Costilla County locator map
Location of Costilla County on Colorado map.


Costilla County is located at 37°16'41"N 105°25'42"W (37.2781000, -105.4282700). It has 6 neighbors: Conejos County, Huerfano County, Las Animas County, Colfax County, Taos County and Alamosa County.

Costilla County map

The largest city of Costilla County is San Luis with a population of 692. Other cities include and Blanca population 407. See all Costilla County cities & populated places.

Costilla County Populated Places

Cities, Towns, Neighborhoods & Other Populated Places in Costilla County.

City Name Population Title
San Luis 692 County seat of Costilla County, Colorado, United States
Blanca 407 Human settlement in Costilla County, Colorado, United States of America


Costilla County forecast: Mostly clear, with a low around 27. South southeast wind around 5 mph. more

Costilla County has 6 neighbours.


The population of Costilla County increased by 10.12% in 10 years.

Year Population % Change Method
2010 3,524 - census
2011 3,641 3.21% estimation process
2012 3,603 -1.05% estimation process
2013 3,541 -1.75% estimation process
2014 3,561 0.56% estimation process
2015 3,576 0.42% estimation process
2016 3,693 3.17% estimation process
2017 3,756 1.68% estimation process
2018 3,812 1.47% estimation process
2019 3,887 1.93% estimation process
2020 3,921 0.87% estimation process

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Local Places in Costilla County

Other places with the same name (1)

Colorado Other Counties (more counties)

County Name Population Title
Denver 735,538 Capital city of the state of Colorado, United States; consolidated city and county
Denver County 735,538 County in Colorado, United States, coterminous with the City of Denver
El Paso County 728,310 One of the 64 counties in the U.
Arapahoe County 657,452 County in Colorado, United States
Jefferson County 583,283 County in Colorado, United States
Adams County 519,883 County in Colorado, United States
Colorado Springs 482,131 County seat of El Paso County, Colorado, United States
Aurora 387,377 City in Kane County, Illinois, United States
Douglas County 360,750 County in Colorado, United States
Larimer County 360,428 County in Colorado, United States
Weld County 333,983 County in Colorado, United States
Boulder County 327,171 County in Colorado, United States
Pueblo County 169,823 County in Colorado, United States
Fort Collins 168,234 Municipality and county seat of Larimer County, Colorado, United States
Lakewood 157,429 City in Colorado
Mesa County 155,603 County in Colorado, United States