Prefix 303-505 — Denver, CO
303-505 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 — 303-505 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.
NANPA's central-office code records list T-MOBILE USA, INC. (OCN 6529) as the code holder, assigned November 9, 2012. Because 303-505 participates in thousands-block pooling, individual 1,000-number blocks may belong to other carriers than the code holder.
Neighboring prefixes
| Prefix | Rate center | Code holder |
|---|---|---|
| 303-502 | Fort Lupton | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO |
| 303-503 | Denver | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO |
| 303-504 | Denver | QWEST CORPORATION |
| 303-506 | Fort Lupton | NEW CINGULAR WIRELESS PCS, LLC |
| 303-507 | Denver | T-MOBILE USA, INC. |
| 303-508 | Denver | AMERICAN MESSAGING SERVICES, LLC |
FAQ
Where is 303-505 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 303-505 numbers?
T-MOBILE USA, INC. 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 303-505 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.