area codes

Area Code 303

Area code 303 is located in central Colorado, covering Denver, Aurora, Lakewood, Thornton, Arvada, Westminster and Centennial. It was put into service on January 01, 1947. Area code 303 is the older Numbering Plan Area in overlay complex 303/720/983.

Colorado Counties within Area Code 303:

Denver, Arapahoe, Jefferson, Adams, Boulder, Douglas, Broomfield, Weld, Elbert, Clear Creek, Gilpin, Park.

Colorado Major Cities within Area Code 303:

Denver, Aurora, Thornton, Lakewood, Arvada, Westminster, Centennial, Boulder, Highlands Ranch, Longmont, Broomfield, Castle Rock, Commerce City, Parker, Littleton, Northglenn, Brighton, Ken Caryl, Dakota Ridge, Englewood, Wheat Ridge, Lafayette, Columbine, Louisville, Sherrelwood, Golden, Erie, Welby, Greenwood Village, Superior, Federal Heights, Berkley, Cherry Creek, The Pinery, Castle Pines North, Lone Tree, Firestone, Gunbarrel, Roxborough Park, Evergreen, Stonegate, Derby, Frederick, Fairmount, Fort Lupton, Applewood, Twin Lakes, Cherry Hills Village, Sheridan,Dove Valley.

Area Code 303 Time Zone?

Mountain time zone is also known as America/Denver.

Go here to see the complete list of United States Area Codes.

By Maurelio Canon

A tech geek and an avid gamer. I love to learn about new technologies and share that knowledge with my readers.

I graduated with a degree in IT, and now I'm an editor at several technology websites. My job is to make sure that all of our content is up-to-date and accurate, so we can help you answer your questions about the latest technology.

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