Prefix 303-328 — Denver, CO
A phone number starting 303-328 was issued in the Denver rate center of CO — part of area code 303.
The assigned code holder is MCIMETRO ACCESS TRANSMISSION SERVICES LLC, operating company number 7229. This is a pooled prefix — expect numbers within it to be split across more than one carrier in 1,000-number blocks.
A scammer can display 303-328 without ever touching CO. When in doubt, end the call and reach the company or agency through its official website; unwanted robocalls belong in the FTC's fraud report queue.
Denver is part of the Denver-Aurora-Centennial, CO Metropolitan Statistical Area. For routing purposes it sits in LATA 656. Numbers here keep Mountain time.
Neighboring prefixes
| Prefix | Rate center | Code holder |
|---|---|---|
| 303-325 | Denver | LEVEL 3 COMMUNICATIONS, LLC - CO |
| 303-326 | Denver | QWEST CORPORATION |
| 303-327 | Denver | LEVEL 3 COMMUNICATIONS, LLC - CO |
| 303-329 | Denver | QWEST CORPORATION |
| 303-330 | Denver | ONVOY, LLC - CO |
| 303-331 | Denver | QWEST CORPORATION |
FAQ
Where is 303-328 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 303-328 numbers?
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 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 303-328 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.