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303 Area Code Phone Directory

Phone Prefixes in the 303 Area Code

(303) 2XX (303) 3XX (303) 4XX (303) 5XX (303) 6XX (303) 7XX (303) 8XX (303) 9XX

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).

Area Codes Starting with 3

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

80023