Arapahoe County, Colorado
Arapahoe County, Colorado | |
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Little Dry Creek in Englewood | |
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Flag Logo | |
Location within the U.S. state of Colorado | |
| Coordinates: 39°39′N 104°40′W / 39.65°N 104.67°W | |
| Country | United States |
| State | Colorado |
| Founded | November 1, 1861 |
| Named after | The Arapaho Nation |
| Seat | Littleton |
| Largest city | Aurora |
| Area | |
• Total | 805 sq mi (2,080 km2) |
| • Land | 798 sq mi (2,070 km2) |
| • Water | 7.3 sq mi (19 km2) 0.9% |
| Population (2020) | |
• Total | 655,070 (3rd) |
• Estimate (2024) | 666,918 |
| • Density | 820/sq mi (317/km2) |
| Time zone | UTC−7 (Mountain) |
| • Summer (DST) | UTC−6 (MDT) |
| Congressional districts | 1st, 4th, 6th |
| Website | www |
Arapahoe County (/əˈræpəhoʊ/ ə-RAP-ə-hoh) is a county located in the U.S. state of Colorado. As of the 2020 census, its population was 655,070, making it the third-most populous county in Colorado. The county seat is Littleton, and the most populous city is Aurora. The county was named for the Arapaho Native American tribe, who once lived in the region. Arapahoe County is part of the Denver-Aurora-Lakewood metropolitan statistical area. Arapahoe County calls itself "Colorado's First County", since its origins antedate the Pike's Peak Gold Rush.