Colorado Counties
Complete list of all 64 counties in Colorado with population, area, median income, and county seats — plus a free printable blank map.
Labeled outline map of Colorado counties. Download a printable version in SVG, PNG, or PDF.
All 64 Colorado counties
| County | County Seat | Population ▼ | Area | Median Income | Cities |
|---|---|---|---|---|---|
| El Paso | — | 738,696 | 2,127 mi² | $96,298 | 11 |
| Denver | — | 725,116 | 153 mi² | $98,731 | 1 |
| Arapahoe | — | 605,473 | 798 mi² | $106,321 | 5 |
| Jefferson | — | 600,818 | 764 mi² | $110,237 | 14 |
| Adams | — | 550,721 | 1,168 mi² | $97,855 | 12 |
| Weld | — | 396,054 | 3,987 mi² | $103,014 | 34 |
| Douglas | — | 373,996 | 840 mi² | $152,846 | 8 |
| Larimer | — | 356,212 | 2,596 mi² | $93,201 | 14 |
| Boulder | — | 285,786 | 726 mi² | $106,122 | 13 |
| Pueblo | — | 169,167 | 2,386 mi² | $65,935 | 6 |
| Mesa | — | 157,719 | 3,329 mi² | $76,960 | 12 |
| Broomfield | — | 81,344 | 33 mi² | $130,903 | 1 |
| La Plata | — | 57,040 | 1,692 mi² | $84,065 | 5 |
| Fremont | — | 49,496 | 1,533 mi² | $64,167 | 9 |
| Garfield | — | 49,285 | 2,948 mi² | $97,424 | 7 |
How many counties does Colorado have?
Colorado has 64 counties covering 103,643 square miles and roughly 5,862,483 residents. The state was admitted to the Union in 1876 as the 38th state, and the current county boundaries reflect more than a century of administrative subdivision.
The largest county by land area is Las Animas County at 4,773 square miles, home to about 14,379 residents. The most populous is El Paso County with approximately 738,696 residents — a density of about 347 people per square mile.
At the other end of the scale, San Juan County has only about 651 residents.
Denver is both the state capital and the largest city in Colorado.
Related resources
Download a printable outline of Colorado’s county boundaries from our blank map of Colorado page — available in SVG, PNG, and PDF.
Use the What County Am I In? tool to detect which Colorado county a GPS location or address falls in, or the Address to County Lookup for batch input.
For demographic radius analysis, the Find ZIP Codes in Radius and Population Within Radius tools let you draw a circle around any Colorado address and see every ZIP code and the total population inside.
Two SimpleMapLab studies cover Colorado specifically: the 100-mile radius around Denver measures how much of the state lives within 100 miles of its capitol, and the loneliest town in Colorado ranks the state’s most isolated inhabited place. The county-counts blog post puts Colorado’s 64 counties in national context.
Frequently asked questions
Population and demographics are aggregated from ZIP-code-level US Census data via the SimpleMaps dataset. Countiesboundaries are from the US Atlas TopoJSON build of the Census Bureau’s TIGER/Line shapefiles. Land area is from the Census Gazetteer. State counts follow the US Census Bureau’s definition of counties and county-equivalents (50 states + DC = 3,143). All sources are public domain.