NPA-NXX - 510-309

This is the 510-309 subcode (NPA-NXX) prefix page. Follow a prefix to find the number you are looking for. We divide our pages up to make them more user friendly to navigate!

1. Area Codes
2. 510
3. 510-309

The 510-309 subcode mainly covers El Sobrante-pinole in Contra Costa county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of California state. Many of the numbers in this subcode are Cellular (Dedicated) registered to T-mobile. We hear they employ a large number of people in the California office.
Recently there have been an increase in reported calls, we've had over 1049025 comments across our systems for the 510-309 subcode.