U.S. postal lookup

U.S. ZIP Codes Database 2026

Search by ZIP code, city, county, or state and find clear postal details with maps, time zones, and area code data.

42,735 verified records
All states and U.S. territories
Maps and coordinates
State directory

Maryland ZIP Codes

Complete postal directory, details, and geographic map for the State of Maryland.

State ZIP Code City County Area Codes
MD 21912 Warwick Cecil County 302, 410, 443, 667
MD 21913 Cecilton Cecil County 410, 443, 667
MD 21914 Charlestown Cecil County 410, 443, 667
MD 21915 Chesapeake City Cecil County 302, 410, 443, 667
MD 21916 Childs Cecil County 410
MD 21917 Colora Cecil County 410, 443, 667
MD 21918 Conowingo Cecil County 223, 410, 443, 667, 717
MD 21919 Earleville Cecil County 410, 443, 667
MD 21920 Elk Mills Cecil County 410, 443, 667
MD 21921 Elkton Cecil County 302, 410, 443, 484, 610, 667, 835
Page 62 of 63

Geographic Map of Maryland

Postal context

About U.S. ZIP Codes

ZIP codes are a United States Postal Service system introduced in 1963 to make mail routing more accurate and efficient. The standard format uses five digits, while ZIP+4 adds four more digits for a more precise delivery segment.

ZIP codes cover the United States, its territories, military mail routes, and other USPS delivery points. This directory organizes that data for practical lookup by ZIP code, city, county, and state.