Prefix 210-300 — San Antonio, TX

NANPA CO code assignment, current as of July 28, 2026.

Numbers in the 210-300 prefix are registered to the San Antonio rate center in TX, inside area code 210. The prefix is the second block of a ten-digit US number (210-300-XXXX) and pins the number to a billing locality.

NANPA's central-office code records list NEW CINGULAR WIRELESS PCS, LLC - IL (OCN 6534) as the code holder, assigned September 12, 2006. Because 210-300 participates in thousands-block pooling, individual 1,000-number blocks may belong to other carriers than the code holder.

The rate center lies in the San Antonio-New Braunfels, TX Metropolitan Statistical Area. The serving LATA is 566. Local time follows the Central zone.

Spoofing means this prefix on your screen doesn't guarantee a San Antonio caller. Verify independently before trusting a request for money or data.

Neighboring prefixes

FAQ

Where is 210-300 located?

The prefix is assigned to the San Antonio rate center in TX, area code 210. It is part of the San Antonio-New Braunfels, TX Metropolitan Statistical Area.

Which company owns 210-300 numbers?

NEW CINGULAR WIRELESS PCS, LLC - IL 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 210-300 safe to answer?

The prefix itself says nothing about the caller. Legitimate San Antonio businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.