• county
  • FIPS 08117
  • Largest town: Silverthorne

Summit County, Colorado

Summit County had 30,882 residents in the Census Vintage 2024 estimate, on 608.3 square miles of land. It ranks 19th of 64 in Colorado by population and 55th by land area.

Population
30,882
#19 of 64 in Colorado · #1,417 in US
Area
608.3 sq mi
#55 of 64 in Colorado · #1,595 in US
Density
51 / sq mi
#12 of 64 in Colorado · #1,448 in US
Median household income
$105,135
#7 of 64 in Colorado · #89 in US

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

Summit County within Colorado. Pin: Denver.

Measure from here

Tools and pages that start from Summit County

Summit County population, land area and income

Summit County had 30,882 residents in the Census Vintage 2024 estimate, on 608.3 square miles of land. It ranks 19th of 64 in Colorado by population and 55th by land area. That works out to 50.8 people per square mile, below the US average of 96.3, and above the national county median.

The median county-equivalent in Colorado has 15,336 residents, so Summit County is 2.0 times that size.

Its SAIPE 2023 median household income of $105,135 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

30,882

3144th1st

1417th of 3,144 (US)

Land area

608 sq mi

3144th1st

1595th of 3,144 (US)

Density

50.8 / sq mi

3144th1st

1448th of 3,144 (US)

Median household income

$105,135

3143rd1st

89th of 3,143 (US)

Rank within Colorado (64)

Population

30,882

64th1st

19th of 64 (CO)

Land area

608 sq mi

64th1st

55th of 64 (CO)

Density

50.8 / sq mi

64th1st

12th of 64 (CO)

Median household income

$105,135

64th1st

7th of 64 (CO)

How Summit County's population changed since 2020

Summit County lost 357 residents between the July 2020 and July 2024 estimates, a drop of 1.1%. That ranks 50th 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, Summit County recorded 1,083 births and 366 deaths, a natural change of +717. Net international migration added +497 and net domestic migration, people moving to or from other US counties, came to -1,656. The largest single component was domestic migration, which removed 1,656 people.

31.2k202031.2k202130.9k202230.8k202330.9k2024
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
1,083
Deaths
366
Net international migration
+497
Net domestic migration
-1,656
Change, July 2023 to July 2024
+58

Where Summit County is

The Census internal point of Summit County is at 39.621000, -106.137600. 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 Summit 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: Summit County internal point. Dark pin: Denver.

Internal point

Decimal
39.621000, -106.137600
DMS
39°37'15.60"N 106°08'15.36"W
UTM
13N 402358.9E 4386311.5N
Geohash
9xh92ubcn
Plus code
85FMJVC6+CX

Towns in Summit County

4 incorporated places of 1,000+ people have residents in Summit County, 13,857 people together, or 45% of the county. Each figure counts only the part of the town inside Summit County; towns marked "part" extend into another county. The largest is Silverthorne with 5,220.

  1. 01Silverthorne5,220
  2. 02Breckenridge4,892
  3. 03Frisco2,732
  4. 04Dillon1,013
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Summit County

The Census 2024 county adjacency file lists 5 neighbors for Summit County. The most populous is Eagle County, CO, with 54,330 residents. Distances run between Census internal points in a straight line.

Distance to Denver and the nearest big city

Denver is 61.8 miles E of Summit County's internal point in a straight line. The nearest place of 100,000 or more is Arvada, CO (population 121,873), 54.5 miles away. The nearest place of 10,000 or more is Golden, CO (population 20,151), 50.0 miles away.

Summit County FIPS code

The FIPS code of Summit County is 08117: state code 08 for Colorado plus county code 117. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $105,135.

Questions people ask

What is the population of Summit County, Colorado?

The Census Vintage 2024 estimate for July 1, 2024 is 30,882. That is down 357 people (1.1%) from the July 2020 estimate of 31,239.

What is the FIPS code of Summit County?

08117. The first two digits (08) are Colorado; the last three (117) identify the county.

What is the largest town in Summit County?

Silverthorne, with 5,220 residents inside Summit County in 2024.

Which counties border Summit County?

5 county-equivalents border it in the Census 2024 adjacency file: Eagle County, CO; Park County, CO; Grand County, CO; Clear Creek County, CO; Lake 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.