About area code 303: location, common spam callers, related area codes, and more. Includes 303 reverse phone lookup to identify spam callers.

Area code 303 is located in Colorado. Get the area’s map, cities covered, current time, prefixes, and dialing instructions.

Dec 1, 2025 · 303 Area Code located in Colorado, including 26 cities, 10 counties, 1 time zone, map, Census demographics, and 773 active prefixes.

Area code 303 was one of the original North American area codes of 1947, and originally served the entire state of Colorado. It remained the state's sole area code for 40 years.

Browse area code 303 phone numbers, prefixes and exchanges. The 303 area code serves Denver, Englewood, Aurora, Westminster, Boulder, covering 67 ZIP codes in 14 counties.

Mar 9, 2025 · 303 is an area code located in the state of Colorado, US. The largest city it serves is Denver. Find out where 303 area code zone from, which states, counties and cities it covers. Get the …

Where is Area Code 303? The 303 area code is located in the state of Colorado . 303 is one of the 357 three-digit telephone area codes in the USA. It covers roughly 2,551,891 unique phone numbers and …

Find 303 area code details including city, time zone, and map. Lookup area code 303 phone number, name, and location.

303 area code information for Denver, Colorado. Timezone, overlay codes, and more.

Jun 22, 2023 · The 303 area code holds a unique place in Colorado’s history, serving as the state’s first and original area code. Today, it covers a diverse range of cities and communities, from the bustling …