Pick 303 if the number should read as Denver or Boulder.
303 dates from 1947, when it was the code for all of Colorado. Denver, Aurora, Lakewood, Boulder and Longmont are in it today.
The area codes for Denver are 303, 720 and 983.
Area codes in Denver
Get a phone number with the right area code for Denver.
303, 720 and 983 cover the same Denver area, from Aurora and Boulder to Highlands Ranch and Castle Rock. 983 is the newest, from June 2022.
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Denver has three area codes.
- 303Since 1947Denver and BoulderAuroraLakewoodLittleton
2,219 FCC complaints
Get a 303 number - 720Since 1998DenverAuroraLakewoodBoulder
316 FCC complaints
Get a 720 number - 983Since 2022Overlay code
33 FCC complaints
Pick 303 for the original Denver code, or 720 for the same area.
Pick 720 if you want the second Denver code.
720 entered service on June 1, 1998, over the same area as 303. It covers Aurora, Lakewood, Boulder, Longmont and Highlands Ranch.
Pick 719 if the number is for Colorado Springs or Pueblo.
719 was split from 303 in 1988. It covers Colorado Springs and Pueblo, not Denver.
People filed 2,568 FCC complaints about unwanted calls from Denver area codes in 12 months.
From October 2025 to September 2026, 2,568 unwanted-call complaints filed with the FCC gave a caller ID number that started with 303, 720 and 983. 303 was named most, on 2,219 of them (86%).
- 2,568unwanted-call complaints named a Denver code
- 303was named on the most of them, 2,219
- 86%of the Denver complaints named 303
Source: Federal Communications Commission, CGB - Consumer Complaints Data (dataset 3xyp-aqkj), issue "Unwanted Calls", read on November 4, 2026. Caller ID can be faked, so a code shows what appeared on the phone, not where the caller was.
This is how you get a Denver number.
- 1
Start your free week.
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- 2
Type the code you picked.
Open Create a number, type the three digits and give the number a name.
- 3
Hand the number out.
Calls ring the phone you already have, and texts land in your ExpressNumber inbox.
People ask these questions about Denver area codes.
More in the full FAQ.
No. 970 was split from 303 in 1995 and covers northern and western Colorado. Denver uses 303, 720 and 983.
983, which entered service on June 17, 2022. The commission approved it on May 21, 2021, and it is laid over 303 and 720.
A local call in Denver is dialed with ten digits, whichever of its codes the number starts with. The area code is part of every number you give out.
From October 2025 to September 2026, people filed 2,568 FCC complaints about unwanted calls from numbers that start with a Denver code: 303 (2,219), 720 (316) and 983 (33). A complaint is one person's report. Caller ID can be faked, so a code shows what appeared on the phone, not where the caller was.
Yes. You type the area code you want when you create a number, and you do not need to live in Denver. Calls ring the phone you already have, and texts land in your ExpressNumber inbox.
No. Your numbers are receive-only: they take calls and texts, and they never make them. You answer calls on your own phone, and you cannot reply to a text from the inbox.
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Codes around Denver
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Every fact on this page comes from public numbering records.
The codes, the places and the years are rows of the North American Numbering Plan Administrator's area code database, and the complaints are the FCC's own.
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