Clicking on an area code will show the cities in that area code. 303 719 720 970. ZIP codes for Denver, Colorado, US. Find area codes fast with the Area Code Search. Denver has adopted the 2018 ICC (International Code Council) codes listed below. Area Codes in Colorado - Below are all the area codes in Colorado. Area Code Search. DENVER CO Colorado zip codes, maps, area codes, county, population, household income, house value,80222 Zip Code - List of all area codes in Denver, CO. Denver, CO area code map, list, and phone lookup. Lookup area codes in DENVER County, CO. Get NPA NXX (area code and prefix) information for DENVER County, CO. You are responsible for ensuring that your project complies with ICC codes as well as Denver's amendments to the ICC codes, which are located in the Denver Building and Fire Code. In 1998 area code 720 was put into use as an overlay of area code 303. Use our interactive map, address lookup, or code list to find the correct 5-digit or 9-digit (ZIP+4) code for your postal mails destination. 303/720, which serve Denver and Boulder; 719, which serves Colorado Springs and southeastern Colorado; 970, which serves northern and western Colorado Map of ZIP Codes in Denver, Colorado. Enter a city and state in the search box below to find all the area codes in that city. List of Zipcodes in Denver, Colorado; ZIP Code: ZIP Code Name: Population: Type The International dialing code calculator will show how to dial to USA – Colorado – Denver from any location in the world, with local area codes, trunk prefixes and international country codes Today area code 303 and 720 covers central Colorado including Boulder and Denver. The state of Colorado is served by the following area codes: . Area code 719 covers southeastern Colorado including Pueblo and Colorado Springs. Area code 970 covers northern and western Colorado including Aspen, Durango, Grand Junction and Fort Collins.