Find the last 4 digits (ZIP+4) for an address in 20879

ZIP 20879, Gaithersburg, MD is filled in. Just type the street address.

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ZIP Code 20879 – Gaithersburg, MD

Gaithersburg, Maryland · Montgomery County · Eastern time

ZIP code20879
CityGaithersburg
StateMaryland
CountyMontgomery County
Population25,264
Time zoneEastern · local time
ZIP typeStandard (has a Census ZCTA area)
Land area8.62 sq mi
Center (lat, long)39.1673, -77.1641

Area codes in this area

227240301

These are the area codes that most often serve ZIP 20879 (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

20880 Washington Grove · 1.9 mi20877 Gaithersburg · 2.4 mi20885 Gaithersburg · 2.5 mi20886 Montgomery Village · 2.6 mi20855 Derwood · 2.7 mi20813 Bethesda · 2.8 mi20827 Bethesda · 2.8 mi20848 Rockville · 2.8 mi

About ZIP 20879

ZIP code 20879 is assigned to Gaithersburg, Maryland. It lies in Montgomery County. Its Census area covers about 8.62 square miles of land. The closest neighboring ZIP is 20880 (Washington Grove), about 1.9 miles away.

Every address in 20879 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