303 Area Code Phone Directory

Information for Area Code 303

State: CO
Largest City in Area: DENVER

Where is Area Code 303?

Area code (303) is in the state of CO. 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

80001
80002
80003
80004
80005
80006
80007
80010
80011
80012
80013
80014
80015
80016
80017
80018
80019
80020
80021
80022