Data / Rankings / Population / Cities in Colorado

Cities in Colorado by population

Denver, CO had the highest population of 54 cities in 2021, at 712,156. Timnath, CO had the lowest, at 7,805. The median was 30,204 and the figure for Colorado was 5.81 million. Source: the U.S. Census Bureau.

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Highest712,156Denver, CO
Lowest7,805Timnath, CO
Median30,20454 cities
Colorado5,814,368History

All cities, 2021

Denver, CO: 712,156 personsDenver, CO712,156Colorado Springs, CO: 484,135 personsColorado Springs, CO484,135Aurora, CO: 390,508 personsAurora, CO390,508Fort Collins, CO: 169,303 personsFort Collins, CO169,303Lakewood, CO: 157,164 personsLakewood, CO157,164Thornton, CO: 142,827 personsThornton, CO142,827Arvada, CO: 123,538 personsArvada, CO123,538Westminster, CO: 115,088 personsWestminster, CO115,088Pueblo, CO: 112,020 personsPueblo, CO112,020Greeley, CO: 108,530 personsGreeley, CO108,530Centennial, CO: 106,950 personsCentennial, CO106,950Boulder, CO: 104,408 personsBoulder, CO104,408Longmont, CO: 99,762 personsLongmont, CO99,762Loveland, CO: 76,993 personsLoveland, CO76,993Castle Rock, CO: 76,659 personsCastle Rock, CO76,659Broomfield, CO: 75,413 personsBroomfield, CO75,413Grand Junction, CO: 66,921 personsGrand Junction, CO66,921Commerce City, CO: 64,372 personsCommerce City, CO64,372Parker, CO: 60,342 personsParker, CO60,342Littleton, CO: 45,330 personsLittleton, CO45,330Brighton, CO: 40,837 personsBrighton, CO40,837Northglenn, CO: 37,398 personsNorthglenn, CO37,398Windsor, CO: 35,762 personsWindsor, CO35,762Englewood, CO: 33,684 personsEnglewood, CO33,684Wheat Ridge, CO: 32,337 personsWheat Ridge, CO32,337Erie, CO: 31,565 personsErie, CO31,565Lafayette, CO: 30,707 personsLafayette, CO30,707Fountain, CO: 29,700 personsFountain, CO29,700Evans, CO: 22,349 personsEvans, CO22,349Louisville, CO: 20,883 personsLouisville, CO20,883Montrose, CO: 20,725 personsMontrose, CO20,725Golden, CO: 20,704 personsGolden, CO20,704Durango, CO: 19,122 personsDurango, CO19,122Johnstown, CO: 18,211 personsJohnstown, CO18,211Firestone, CO: 17,300 personsFirestone, CO17,300Cañon City, CO: 17,082 personsCañon City, CO17,082Frederick, CO: 15,786 personsFrederick, CO15,786Greenwood Village, CO: 15,536 personsGreenwood Village, CO15,536Lone Tree, CO: 14,240 personsLone Tree, CO14,240Federal Heights, CO: 14,205 personsFederal Heights, CO14,205Fruita, CO: 13,567 personsFruita, CO13,567Steamboat Springs, CO: 13,387 personsSteamboat Springs, CO13,387Sterling, CO: 13,212 personsSterling, CO13,212Superior, CO: 13,105 personsSuperior, CO13,105Castle Pines, CO: 12,303 personsCastle Pines, CO12,303Wellington, CO: 11,700 personsWellington, CO11,700Berthoud, CO: 11,685 personsBerthoud, CO11,685Fort Morgan, CO: 11,440 personsFort Morgan, CO11,440Monument, CO: 10,863 personsMonument, CO10,863Rifle, CO: 10,512 personsRifle, CO10,512Glenwood Springs, CO: 10,352 personsGlenwood Springs, CO10,352Severance, CO: 9,653 personsSeverance, CO9,653Fort Lupton, CO: 8,262 personsFort Lupton, CO8,262Timnath, CO: 7,805 personsTimnath, CO7,805Denver, CO: 712,156 personsDenver, CO712,156Colorado Springs, CO: 484,135 personsColorado Springs, CO484,135Aurora, CO: 390,508 personsAurora, CO390,508Fort Collins, CO: 169,303 personsFort Collins, CO169,303Lakewood, CO: 157,164 personsLakewood, CO157,164Thornton, CO: 142,827 personsThornton, CO142,827Arvada, CO: 123,538 personsArvada, CO123,538Westminster, CO: 115,088 personsWestminster, CO115,088Pueblo, CO: 112,020 personsPueblo, CO112,020Greeley, CO: 108,530 personsGreeley, CO108,530Centennial, CO: 106,950 personsCentennial, CO106,950Boulder, CO: 104,408 personsBoulder, CO104,408Longmont, CO: 99,762 personsLongmont, CO99,762Loveland, CO: 76,993 personsLoveland, CO76,993Castle Rock, CO: 76,659 personsCastle Rock, CO76,659Broomfield, CO: 75,413 personsBroomfield, CO75,413Grand Junction, CO: 66,921 personsGrand Junction, CO66,921Commerce City, CO: 64,372 personsCommerce City, CO64,372Parker, CO: 60,342 personsParker, CO60,342Littleton, CO: 45,330 personsLittleton, CO45,330Brighton, CO: 40,837 personsBrighton, CO40,837Northglenn, CO: 37,398 personsNorthglenn, CO37,398Windsor, CO: 35,762 personsWindsor, CO35,762Englewood, CO: 33,684 personsEnglewood, CO33,684Wheat Ridge, CO: 32,337 personsWheat Ridge, CO32,337Erie, CO: 31,565 personsErie, CO31,565Lafayette, CO: 30,707 personsLafayette, CO30,707Fountain, CO: 29,700 personsFountain, CO29,700Evans, CO: 22,349 personsEvans, CO22,349Louisville, CO: 20,883 personsLouisville, CO20,883Montrose, CO: 20,725 personsMontrose, CO20,725Golden, CO: 20,704 personsGolden, CO20,704Durango, CO: 19,122 personsDurango, CO19,122Johnstown, CO: 18,211 personsJohnstown, CO18,211Firestone, CO: 17,300 personsFirestone, CO17,300Cañon City, CO: 17,082 personsCañon City, CO17,082Frederick, CO: 15,786 personsFrederick, CO15,786Greenwood Village, CO: 15,536 personsGreenwood Village, CO15,536Lone Tree, CO: 14,240 personsLone Tree, CO14,240Federal Heights, CO: 14,205 personsFederal Heights, CO14,205Fruita, CO: 13,567 personsFruita, CO13,567Steamboat Springs, CO: 13,387 personsSteamboat Springs, CO13,387Sterling, CO: 13,212 personsSterling, CO13,212Superior, CO: 13,105 personsSuperior, CO13,105Castle Pines, CO: 12,303 personsCastle Pines, CO12,303Wellington, CO: 11,700 personsWellington, CO11,700Berthoud, CO: 11,685 personsBerthoud, CO11,685Fort Morgan, CO: 11,440 personsFort Morgan, CO11,440Monument, CO: 10,863 personsMonument, CO10,863Rifle, CO: 10,512 personsRifle, CO10,512Glenwood Springs, CO: 10,352 personsGlenwood Springs, CO10,352Severance, CO: 9,653 personsSeverance, CO9,653Fort Lupton, CO: 8,262 personsFort Lupton, CO8,262Timnath, CO: 7,805 personsTimnath, CO7,805
persons. Source: U.S. Census Bureau, Annual estimates of the resident population for incorporated places, 1 July (Population Estimates Program, subcounty totals). Retrieved 2026-10-12.

Full ranking

RankCities2021
persons		Change on 2020
1Denver, CO712,156-0.8%
2Colorado Springs, CO484,135+0.6%
3Aurora, CO390,508+1%
4Fort Collins, CO169,303-0.4%
5Lakewood, CO157,164+0.6%
6Thornton, CO142,827+0.5%
7Arvada, CO123,538-0.7%
8Westminster, CO115,088-1.3%
9Pueblo, CO112,020+0.1%
10Greeley, CO108,530-0.7%
11Centennial, CO106,950-0.7%
12Boulder, CO104,408-3.7%
13Longmont, CO99,762+0.6%
14Loveland, CO76,993+0.9%
15Castle Rock, CO76,659+3.8%
16Broomfield, CO75,413+1.2%
17Grand Junction, CO66,921+1.8%
18Commerce City, CO64,372+2.6%
19Parker, CO60,342+2.7%
20Littleton, CO45,330-0.5%
21Brighton, CO40,837+1.4%
22Northglenn, CO37,398-1.7%
23Windsor, CO35,762+7.6%
24Englewood, CO33,684+0.2%
25Wheat Ridge, CO32,337-0.1%
26Erie, CO31,565+3.8%
27Lafayette, CO30,707+1%
28Fountain, CO29,700-0.6%
29Evans, CO22,349+0.3%
30Louisville, CO20,883-1.5%
31Montrose, CO20,725+1.6%
32Golden, CO20,704+1.5%
33Durango, CO19,122+0.1%
34Johnstown, CO18,211+4.9%
35Firestone, CO17,300+3.9%
36Cañon City, CO17,082+1%
37Frederick, CO15,786+7.3%
38Greenwood Village, CO15,536-0.6%
39Lone Tree, CO14,240+0.2%
40Federal Heights, CO14,205-1.3%
41Fruita, CO13,567+1%
42Steamboat Springs, CO13,387+1.2%
43Sterling, CO13,212-1.5%
44Superior, CO13,105-0%
45Castle Pines, CO12,303+9.8%
46Wellington, CO11,700+4.8%
47Berthoud, CO11,685+10.2%
48Fort Morgan, CO11,440-1%
49Monument, CO10,863+4.2%
50Rifle, CO10,512+0.7%
51Glenwood Springs, CO10,352+3.5%
52Severance, CO9,653+20.5%
53Fort Lupton, CO8,262+3.4%
54Timnath, CO7,805+15.5%

Other periods

About this ranking

Resident population.

More on how it is measured
  • Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón).
  • Norway: Statistics Norway, 1 January.
  • Iceland and its municipalities: Statistics Iceland, 1 January.
  • United States: Census Bureau population estimates for 1 July.
  • United Kingdom regions and local authorities: Office for National Statistics estimates for 30 June.
  • Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.
  • UN World Population Prospects estimates for 1 July cover the years before 1960 and the areas the World Bank does not publish, such as Taiwan.

The World Bank series exists for every country, so use it (through compare) to rank countries on one basis.

Every value in the ranking comes from the same publisher and the same period, so the cities are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. Annual estimates of the resident population for incorporated places, 1 July (Population Estimates Program, subcounty totals). https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). Annual estimates of the resident population for incorporated places, 1 July (Population Estimates Program, subcounty totals) (Cities in Colorado by population, 2021) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/

MLA 9

Annual estimates of the resident population for incorporated places, 1 July (Population Estimates Program, subcounty totals), Cities in Colorado by population, 2021. U.S. Census Bureau, 14 May 2026, https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Invokely, https://invokely.ai/rankings/population/colorado-cities?period=2021. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Annual estimates of the resident population for incorporated places, 1 July (Population Estimates Program, subcounty totals). Cities in Colorado by population, 2021. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Also distributed by Invokely, https://invokely.ai/rankings/population/colorado-cities?period=2021.

Harvard

U.S. Census Bureau (2026) Annual estimates of the resident population for incorporated places, 1 July (Population Estimates Program, subcounty totals), Cities in Colorado by population, 2021 [Dataset]. Available at: https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/, via Invokely: https://invokely.ai/rankings/population/colorado-cities?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_cities_in_colorado_by_2021,
  author = {{U.S. Census Bureau}},
  title = {{Annual estimates of the resident population for incorporated places, 1 July (Population Estimates Program, subcounty totals): Cities in Colorado by population, 2021}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/population/colorado-cities?period=2021. Publisher attribution: U.S. Census Bureau. Annual estimates of the resident population for incorporated places, 1 July (Population Estimates Program, subcounty totals). https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - Annual estimates of the resident population for incorporated places, 1 July (Population Estimates Program, subcounty totals): Cities in Colorado by population, 2021
PY  - 2026
DA  - 2026/05/14
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/
L2  - https://invokely.ai/rankings/population/colorado-cities?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population/colorado-cities?period=2021.
N1  - Publisher attribution: U.S. Census Bureau. Annual estimates of the resident population for incorporated places, 1 July (Population Estimates Program, subcounty totals). https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-12.
ER  -
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Questions

Which city has the highest population?

Denver, CO, with 712,156 in 2021, according to the U.S. Census Bureau.

Which city has the lowest population?

Timnath, CO, with 7,805 in 2021.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Annual estimates of the resident population for incorporated places, 1 July (Population Estimates Program, subcounty totals). Retrieved 2026-10-12.

Population: other rankings

Cities in Colorado: more rankings