Littleton
- County:
- Arapahoe County
- County Seat:
- Yes
- Area (mi²):
- 12.619
- State:
- Colorado
Littleton is a city located in Arapahoe County, Colorado. Littleton has a 2026 population of 44,879. It is also the county seat of Arapahoe County. Littleton is currently growing at a rate of 0.33% annually but its population has decreased by -1.58% since the most recent census, which recorded a population of 45,598 in 2020.