NPA-NXX - 925-640

This is the 925-640 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. 925
3. 925-640

The 925-640 subcode mainly covers Dublin-san Ramon in Alameda 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 At&t Mobility. 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 1510271 comments across our systems for the 925-640 subcode.