Summit County , Colorado

Summit County: County in Colorado, United States


Summit County is a county located in the U.S. state of Colorado. As of the 2010 census, the population was 27,994 and a population density of 17 people per km². After 10 years in 2020 county had an estimated population of 30,631 inhabitants. Its county seat is Breckenridge. The county was created 161 years ago in 1860.

Summit County Quick Facts

Population : 30,631 (2020)
Country : United States of America
State : Colorado (United States)
Different from : Summit County, Summit County
Area : 1604 km2
Water as percent of area : 1.8%
Land as percent of area : 98.2%
Named for : Continental Divide of the Americas
Capital : Breckenridge
Establishment : January 01, 1861
Time Zone : America/Denver
Local time : 02:50:24 (16th May 2022)
Density : 19 Pop. per km² as of 2020
Population growth : 8.61% (2010-2020)
Summit County locator map
Location of Summit County on Colorado map.
Summit County court house in Colorado image
Summit County court house in Colorado
Summit County court house in Colorado image


Summit County is located at 39°38'3"N 106°6'59"W (39.6341700, -106.1163800). It has 4 neighbors: Clear Creek County, Eagle County, Lake County and Park County.

Summit County map

The largest city of Summit County is Blue River with a population of 928. . See all Summit County cities & populated places.

Summit County Populated Places

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

City Name Population Title
Breckenridge 4,954 Town in Colorado, USA
Silverthorne 4,906 Town in Colorado, USA
Frisco 2,874 Town in Summit County, Colorado, United States of America
Dillon 967 Town in Colorado, USA
Blue River 928 Human settlement in Summit County, Colorado, United States of America
Montezuma 75 Town in Colorado, USA

Summit County has 4 neighbours.


The population of Summit County increased by 8.61% in 10 years.

Year Population % Change Method
2010 27,994 - census
2011 28,042 0.17% estimation process
2012 28,298 0.9% estimation process
2013 28,728 1.5% estimation process
2014 29,317 2.01% estimation process
2015 30,045 2.42% estimation process
2016 30,552 1.66% estimation process
2017 30,820 0.87% estimation process
2018 30,817 -0.01% estimation process
2019 31,011 0.63% estimation process
2020 30,631 -1.24% estimation process

Comitatul Summit, Comte de Summit, Comté de Summit, Condado de Summit, Condado han Summit, Contea di Summit, Hrabstwo Summit, Okrug Samit, Quan Summit, Quận Summit, Sammit, Sumit, Summit, Summit Kun, Summit Kūn, Summit konderria, Summit megye, Summiti maakond, mqatʿt smyt, sa mi te xian, samita ka'unti, samitto jun, shhrstan samyt klradw, Округ Самит, Саммит, Самміт, Съмит, Սամիթ շրջան, سمٹ کاؤنٹی، کولوراڈو, شهرستان سامیت، کلرادو, مقاطعة سميت, সামিট কাউন্টি, サミット郡, 薩米特縣

Other places with the same name (3)

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