ZIP Code 80109 – Castle Rock, CO
Castle Rock, Colorado · Douglas County · Mountain time
| ZIP code | 80109 |
|---|---|
| City | Castle Rock |
| State | Colorado |
| County | Douglas County |
| Population | 28,400 |
| Time zone | Mountain · local time |
| ZIP type | Standard (has a Census ZCTA area) |
| Land area | 25.99 sq mi |
| Center (lat, long) | 39.3723, -104.9121 |
Area codes in this area
These are the area codes that most often serve ZIP 80109 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.
Map
Nearby ZIP codes
About ZIP 80109
ZIP code 80109 is assigned to Castle Rock, Colorado. It lies in Douglas County. Its Census area covers about 25.99 square miles of land. The closest neighboring ZIP is 80163 (Littleton), about 4.7 miles away.
Every address in 80109 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.
Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources