Prefix 303-354 — Denver, CO
303-354 identifies a block of numbers in Denver, CO, within the 303 area code. Every US prefix is tied to exactly one rate center; this one is Denver.
The rate center lies in the Denver-Aurora-Centennial, CO Metropolitan Statistical Area. The serving LATA is 656. Local time follows the Mountain zone.
Treat the on-screen number as a hint, not evidence — 303-354 can be spoofed like any US prefix. If a call feels off, verify through an official callback number and file a complaint with the FCC or FTC.
Code-holder of record: TELEPORT COMMUNICATIONS AMERICA, LLC - CO (OCN 7378). The prefix is pooled: its ten thousands-blocks can be shared among several carriers, so different 303-354 numbers may be served by different companies.
Neighboring prefixes
| Prefix | Rate center | Code holder |
|---|---|---|
| 303-351 | Deckers | ONVOY, LLC - CO |
| 303-352 | Denver | QWEST CORPORATION |
| 303-353 | Denver | COMCAST IP PHONE, LLC |
| 303-355 | Denver | QWEST CORPORATION |
| 303-356 | Denver | T-MOBILE USA, INC. |
| 303-357 | Denver | MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
FAQ
Where is 303-354 located?
The prefix is assigned to the Denver rate center in CO, area code 303. It is part of the Denver-Aurora-Centennial, CO Metropolitan Statistical Area.
Which company owns 303-354 numbers?
TELEPORT COMMUNICATIONS AMERICA, LLC - CO holds the code, but the prefix is pooled — individual thousands-blocks can be assigned to other carriers, and numbers may be ported to any provider.
Is a call from 303-354 safe to answer?
The prefix itself says nothing about the caller. Legitimate Denver businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.