Area code 303

Area code 303 is a geographic code in the North American Numbering Plan. Most of this region uses the America/Denver time zone.

Other area codes in Colorado: 719, 720, 748, 970, 983.

Is a call from 303 local?

Not necessarily. People keep their numbers when they move, internet phone numbers can be used anywhere, and robocallers often spoof local-looking numbers. Learn about spoofing.