Find the last 4 digits (ZIP+4) for an address in 20878

ZIP 20878, Gaithersburg, MD is filled in. Just type the street address.

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ZIP Code 20878 – Gaithersburg, MD

Gaithersburg, Maryland · Montgomery County · Eastern time

ZIP code20878
CityGaithersburg
StateMaryland
CountyMontgomery County
Population66,115
Time zoneEastern · local time
ZIP typeStandard (has a Census ZCTA area)
Land area20.45 sq mi
Center (lat, long)39.1126, -77.2504

Area codes in this area

227240301

These are the area codes that most often serve ZIP 20878 (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

20899 Gaithersburg · 2.9 mi20874 Germantown · 3.1 mi20813 Bethesda · 3.2 mi20827 Bethesda · 3.2 mi20848 Rockville · 3.2 mi20859 Potomac · 3.2 mi20875 Germantown · 3.2 mi20884 Gaithersburg · 3.2 mi

About ZIP 20878

ZIP code 20878 is assigned to Gaithersburg, Maryland. It lies in Montgomery County. Its Census area covers about 20.45 square miles of land. The closest neighboring ZIP is 20899 (Gaithersburg), about 2.9 miles away.

Every address in 20878 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