303 Area Code Information
State: CO
Largest City in Area: DENVER
Where is Area Code 303? Area code (303) is in the state of CO. The PeopleSearchNow database has 6,791,984 records on file with a phone number in the area code of (303). Below, are the major cities in the area code (303).
Major Cities in 303
- DENVER, CO (3,359,794)
- AURORA, CO (1,459,492)
- LITTLETON, CO (958,173)
- LAKEWOOD, CO (936,600)
- ARVADA, CO (738,214)
- BOULDER, CO (588,368)
- CENTENNIAL, CO (560,525)
- THORNTON, CO (544,489)
- ENGLEWOOD, CO (534,672)
- WESTMINSTER, CO (534,353)
Zip Codes in 303
- 80003
- 80004
- 80011
- 80012
- 80013
- 80014
- 80017
- 80031
- 80123
- 80206
- 80209
- 80210
- 80211
- 80219
- 80220
- 80221
- 80226
- 80228
- 80231
- 80401