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 20892 Bethesda Montgomery County 227, 240, 301
MD 20894 Bethesda Montgomery County 227, 240, 301
MD 20895 Kensington Montgomery County 227, 240, 301
MD 20896 Garrett Park Montgomery County 227, 240, 301
MD 20897 Suburb Maryland Fac Montgomery County 240
MD 20898 Gaithersburg Montgomery County 240
MD 20899 Gaithersburg Montgomery County 227, 240, 301
MD 20901 Silver Spring Montgomery County 227, 240, 301
MD 20902 Silver Spring Montgomery County 227, 240, 301
MD 20903 Silver Spring Montgomery County 227, 240, 301
Page 21 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.