Area Code 303: Who Called Me From Denver?
Your 303 number, with +1 in front
Denver 303 robocalls in 2026
Recorded calls from local-looking numbers in area code 303 have surged this year. Look up the one that called you before pressing anything.
Where is area code 303?
Area code 303 is Denver and the nearby Front Range: the Denver rate center holds nearly the whole code, with a few in towns such as Longmont, Fort Lupton and Keenesburg. Denver lines also come as 720 or, more recently, 983. Boulder and the rest of the metro share these codes too.
| Location | Denver and the Front Range, Colorado |
|---|---|
| State | Colorado |
| Time zone | Mountain Time (MT) |
| Origin | A 1947 code that originally covered all of Colorado |
| Shares its area with | 720 and 983 |
| Exchanges assigned | 784 |
| Local rate centers | 13 |
| Carriers holding exchanges | 27 |
Denver and the Front Range
Denver sits where the plains meet the Rocky Mountains, and 303 covers the city plus nearby Front Range communities. Besides the Denver rate center, the code reaches towns such as Longmont, Fort Lupton, Keenesburg and Deer Trail, and mountain spots like Georgetown and Deckers.
Where 303 exchanges are
| Place (rate center) | Exchanges |
|---|---|
| Denver | 735 |
| Longmont | 18 |
| Fort Lupton | 11 |
| Deckers | 5 |
| Keenesburg | 3 |
303 robocall and scam complaints
303 is having an exceptional year. FCC complaints jumped from 207 in all of 2025 to 2,311 so far in 2026, starting in March and peaking in July (507 in one month). They are prerecorded calls (1,873 of 2,342 in the last year) and Coloradans filed 98% of them. No single number has more than 7 complaints, so the calls come from many different local-looking numbers, which is typical of a robocall campaign.
303 FCC complaints by year
*2026-10-21
303 complaints month by month
| Nov 25 | Dec 25 | Jan 26 | Feb 26 | Mar 26 | Apr 26 | May 26 | Jun 26 | Jul 26 | Aug 26 | Sep 26 | Oct 26 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 20 | 10 | 17 | 10 | 208 | 272 | 285 | 362 | 507 | 272 | 281 | 97 |
303 call types, Oct 2025–Oct 2026
- Recorded message (robocall): 1873 (80%)
- Live caller: 458 (20%)
- Text message: 11 (0%)
Top 303 FTC topics
- Medical and prescription offers: 411
- Dropped calls with no message: 236
- Home improvement and cleaning: 209
Who holds 303 numbers
- Lumen / CenturyLink (landline): 448 exchanges (57%)
- Verizon Wireless: 60 exchanges (8%)
- Lumen (Level 3): 58 exchanges (7%)
- T-Mobile: 39 exchanges (5%)
Qwest, now Lumen, holds more than half of the 303 exchanges, a lot for a single company, and Level 3, also part of Lumen, holds another group. Mobile lines on 303 mostly sit with Verizon Wireless, T-Mobile and AT&T.
A 303 number keeps calling you?
Wondering who called you from 303 with a recording? Check the 303 phone number above. The 303 area code is in the middle of a robocall wave.
Coloradans have a dedicated fraud site run by the Colorado Attorney General, stopfraudcolorado.gov, besides the FTC’s reportfraud.ftc.gov. Forward unwanted texts to 7726.
Frequently asked questions
What city is the 303 area code?
Denver and the nearby Front Range, Boulder included, on Mountain Time. Those exchanges also give out 720 and 983.
Is it safe to answer a 303 number?
Right now 303 numbers are being heavily used for recorded calls: 2,311 FCC complaints so far in 2026 against 207 in all of 2025, almost all from Colorado. That makes it worth looking up any unknown 303 number before you call back.
Why am I getting so many robocalls from 303 numbers?
Since March 2026, FCC complaints about recorded calls from 303 numbers have shot up, almost all from Colorado residents and from many different numbers. It looks like a robocall campaign using local Denver numbers so people pick up. Don’t press any key; hang up and block.
Is 303 the same as 720?
Yes, for practical purposes. 720 and 983 are issued in the same Denver-area exchanges as 303. All three are local to Denver.
Where can I report robocalls in Colorado?
The Colorado Attorney General runs stopfraudcolorado.gov for state residents. The FTC (reportfraud.ftc.gov) and the FCC collect robocall complaints nationwide.
Is 303 the same as 720?
Yes, in practice. 720 has been issued in the same Denver-area exchanges since 1998, and 983 was added more recently. All three are local to Denver.
What’s the local time for a 303 caller?
Denver is on Mountain Time: two hours behind New York and one hour ahead of Los Angeles, with daylight saving time in summer.
More checks after a 303 call
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