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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