Find the last 4 digits (ZIP+4) for an address in 20634

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ZIP Code 20634 – Great Mills, MD

Great Mills, Maryland · St. Mary's County · Eastern time

ZIP code20634
CityGreat Mills
StateMaryland
CountySt. Mary's County
Population7,088
Time zoneEastern · local time
ZIP typeStandard (has a Census ZCTA area)
Land area6.99 sq mi
Center (lat, long)38.2417, -76.4983

Area codes in this area

227240301

These are the area codes that most often serve ZIP 20634 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Map

Nearby ZIP codes

20620 Callaway · 1.4 mi20667 Park Hall · 3.3 mi20653 Lexington Park · 3.8 mi20619 California · 3.9 mi20692 Valley Lee · 4.2 mi20686 Saint Marys City · 5.2 mi20670 Patuxent River · 5.7 mi20630 Drayden · 5.9 mi

About ZIP 20634

ZIP code 20634 is assigned to Great Mills, Maryland. It lies in St. Mary's County. Its Census area covers about 6.99 square miles of land. The closest neighboring ZIP is 20620 (Callaway), about 1.4 miles away.

Every address in 20634 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.

Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources