Prefix 303-501 — Denver, CO
303-501 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 — 303-501 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: CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO (OCN 6567), assigned January 26, 2006. The prefix is pooled: its ten thousands-blocks can be shared among several carriers, so different 303-501 numbers may be served by different companies.
Neighboring prefixes
| Prefix | Rate center | Code holder |
|---|---|---|
| 303-498 | Denver | COMCAST IP PHONE, LLC |
| 303-499 | Denver | QWEST CORPORATION |
| 303-500 | Hudson | LEVEL 3 COMMUNICATIONS, LLC - CO |
| 303-502 | Fort Lupton | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO |
| 303-503 | Denver | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO |
| 303-504 | Denver | QWEST CORPORATION |
FAQ
Where is 303-501 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 303-501 numbers?
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - 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 303-501 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.