US Gazetteer > Maryland Gazetteer > Maryland ZIP Codes > Gaithersburg, MD 20878

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Preferred Name, USPS
Gaithersburg, MD 20878
Acceptable Alternative
Darnestown, MD 20878
N Potomac, MD 20878
No Potomac, MD 20878
North Potomac, MD 20878

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Weather forecast ZIP Code 20878

The 20878 ZIP Code is centered1 in Montgomery County at latitude 39.106 and longitude -77.24 (Panoramio Photos). It is a standard type ZIP Code. Montgomery County is in the Eastern Time Zone (UTC -5 hours) and observes daylight savings time.

The population in ZIP Code Tabulation Area (ZCTA) 20878 was 55,177 with 20,099 housing units; a land area land area of 19.92 sq. miles; a water area of 0.29 sq. miles; and a population density of 2,770.55 people per sq. mile for Census 2000. Demographic Profile

Gaithersburg, MD 20878 Map (Marker is ZIP Code Centroid)

Local Search, 20878 ZIP Code| Distance & Driving Directions

Nearby Cities, Towns & Census Designated Places

Big Pines, MD (1.4 miles SSE)
Quince Orchard, MD (1.4 miles NW)
North Potomac, MD (1.9 miles SW)
Hunting Hill, MD (1.9 miles ESE)
Lakewood Estates, MD (2.7 miles SE)
Darnestown, MD (2.7 miles W)
Travilah, MD (2.7 miles SSW)
Brown, MD (3.1 miles NNE)
Clopper, MD (3.1 miles N)
Metropolitan Grove, MD (3.1 miles NNE)

Nearby Neighborhoods, Subdivisions & Other Small Populated Places

Potomac Grove, MD (< 0.1 mile)
Quince Orchard Knolls, MD (< 0.1 mile)
Mills Farm East, MD (< 0.1 mile)
Mills Farm, MD (1.4 miles SW)
Mountain View Estates, MD (1.4 miles WNW)
Fox Hills Green, MD (1.4 miles WSW)
Fox Hills North, MD (1.4 miles W)
Quail Run, MD (1.4 miles W)
Willow Ridge, MD (1.4 miles NW)
Potomac Chase, MD (1.4 miles SW)

ZIP Codes - Key Concepts

  1. ZIP Codes are categories for grouping mailing addresses and are not exact geographic regions.
  2. The centroid of a ZIP Code may be in one County and the associated city/town in another.
  3. In rural areas, a single ZIP Code may be used for cities and towns in several different Counties / Independent Cities.
  4. ZIP Code "areas" can overlap, be subsets of each other, or be artificial constructs with no geographic area.
  5. ZIP Codes are only loosely tied to cities.

1 Keeping the above key concepts in mind, what we informally refer to as the "center" of a ZIP Code is most often actually the centroid of a polygon.