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Maryland — United States

Welcome to the postal codes directory for Maryland, United States. As a prominent region in United States, Maryland contains 14 major cities indexed. Our platform provides comprehensive zip codes, neighborhood directories, and simulated local phone number generation rules for developer form testing and compliance verification.

14 Total Cities Indexed
MARYLAND Region Code
🔍 Showing 14 cities

Available Cities

14
Aberdeen Baltimore Columbia Frederick Greensboro Henderson Knoxville Madison Manchester Newark Oakland Phoenix Rockville Warwick

Frequently Asked Questions

Regional Divisions & Cities
Maryland encompasses diverse geographical zones and municipal areas. This platform indexes 14 major cities in Maryland, linking each city to its postal codes, neighborhoods, and regional phone area codes.
State-Level Telecom Infrastructure
Under the NANP system, Maryland is allocated several distinct area codes covering specific counties and metropolitan districts. Select a city to explore local dialing overlays and to generate valid mock phone patterns.
How to look up the exact postal code for a specific district or street under Maryland?
You can select the corresponding city from the list above. On the city page, we provide a complete mapping table of districts, streets/neighborhoods, and their exact postal codes. You can also use the search bar at the top to instantly locate a street or neighborhood.