Colorado is the state in United States with 5.2 million populations and area of 104,094 square miles, Denver is the largest city and Capital of Colorado State, has area of 196.32 square km, and population of 649,495 at the density of 1,514 inhabitants per sq km as per the data of 2013. Spring is the second largest city in Colorado with population of 439,886 and largest by Area with 504 square km. Northglenn is the city with highest density at 1,878 inhabitants per square kilometers with total population of 37,499 and area of 19 square miles. The 25 Cities and Towns are listed below with ranking by population including details of Area and Density.
| Rank | Name | Population | Area (km²) | Density (inhabitants/km²) | County |
|---|---|---|---|---|---|
| 1 | Denver | 649,495 | 396.32 | 1,514 | City and County of Denver[ |
| 2 | Colorado Springs | 439,886 | 504.71 | 826 | El Paso County |
| 3 | Aurora | 345,803 | 398.49 | 814 | Arapahoe County, Adams County, Douglas County |
| 4 | Fort Collins | 152,061 | 141.46 | 1,018 | Larimer County |
| 5 | Lakewood | 147,214 | 111.04 | 1,287 | Jefferson County |
| 6 | Thornton | 127,359 | 90.79 | 1,308 | Adams County, Weld County |
| 7 | Arvada | 111,707 | 99.28 | 1,072 | Adams County, Jefferson County |
| 8 | Westminster | 110,945 | 82.04 | 1,293 | Adams County, Jefferson County |
| 9 | Pueblo | 108,249 | 138.8 | 767 | Pueblo County[ |
| 10 | Centennial | 106,114 | 74.86 | 1,341 | Arapahoe County |
| 11 | Boulder | 103,166 | 64.36 | 1,514 | Boulder County[ |
| 12 | Highlands Ranch | 102,000 | 62.83 | 1539 | Douglas County |
| 13 | Greeley | 96,539 | 122.04 | 761 | Weld County[ |
| 14 | Longmont | 89,919 | 70.59 | 1,222 | Boulder County, Weld County |
| 15 | Loveland | 71,334 | 87.67 | 762 | Larimer County |
| 16 | Grand Junction | 59,778 | 100.85 | 585 | Mesa County[ |
| 17 | Broomfield | 59,471 | 85.42 | 653 | City and County of Broomfield |
| 18 | Castle Rock | 53,063 | 87.71 | 550 | Douglas County[ |
| 19 | Commerce City | 49,799 | 90.42 | 507 | Adams County |
| 20 | Parker | 48,608 | 54.85 | 825 | Douglas County |
| 21 | Littleton | 44,275 | 32.98 | 1,265 | Arapahoe County, Jefferson County, Douglas County |
| 22 | Northglenn | 37,499 | 19.04 | 1,878 | Adams County, Weld County |
| 23 | Brighton | 35,719 | 53.05 | 636 | Adams County, Weld County |
| 24 | Englewood | 31,516 | 16.97 | 1,782 | Arapahoe County |
| 25 | Wheat Ridge | 30,920 | 24.26 | 1,244 | Jefferson County |
Source: 2013 US Census Bureau