Prefix 410-403 — Cockeysville, MD

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

410-403 identifies a block of numbers in Cockeysville, MD, within the 410 area code. Every US prefix is tied to exactly one rate center; this one is Cockeysville.

The rate center lies in the Baltimore-Columbia-Towson, MD Metropolitan Statistical Area. The serving LATA is 238. Local time follows the Eastern zone.

Treat the on-screen number as a hint, not evidence — 410-403 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: MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (OCN 7228). The prefix is pooled: its ten thousands-blocks can be shared among several carriers, so different 410-403 numbers may be served by different companies.

Neighboring prefixes

FAQ

Where is 410-403 located?

The prefix is assigned to the Cockeysville rate center in MD, area code 410. It is part of the Baltimore-Columbia-Towson, MD Metropolitan Statistical Area.

Which company owns 410-403 numbers?

MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 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 410-403 safe to answer?

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