US Gazetteer > Maryland Gazetteer > Maryland ZIP Codes > Gaithersburg, MD 20899

City/Town Names Most Popular Resources Current Weather & 7-Day Forecast 
Preferred Name, USPS
Gaithersburg, MD 20899
Not Acceptable, USPS
Natl Institute Stds & Tech, MD 20899

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Weather forecast ZIP Code 20899

The 20899 ZIP Code is centered1 in Montgomery County at latitude 39.144 and longitude -77.215. It is a unique - single entity - type ZIP Code. Montgomery County is in the Eastern Time Zone (UTC -5 hours) and observes daylight savings time.

Gaithersburg, MD 20899 Map (Marker is ZIP Code Centroid)

Local Search, 20899 ZIP Code| Distance & Driving Directions

Nearby Cities, Towns & Census Designated Places

Gaithersburg, MD (< 0.1 mile)
Brown, MD (< 0.1 mile)
Metropolitan Grove, MD (< 0.1 mile)
Clopper, MD (1.4 miles WNW)
Montgomery Village, MD (2.4 miles NNE)
Washington Grove, MD (2.4 miles E)
Middlebrook, MD (2.7 miles NNW)
Emory Grove, MD (2.7 miles E)
Quince Orchard, MD (2.7 miles SW)
Stewart Town, MD (2.7 miles NNE)

Nearby Neighborhoods, Subdivisions & Other Small Populated Places

Orchard Place, MD (< 0.1 mile)
Observatory Heights, MD (< 0.1 mile)
Londonderry, MD (< 0.1 mile)
Dorsey Estates, MD (< 0.1 mile)
Orchard Pond, MD (< 0.1 mile)
 Diamond Farms, MD (< 0.1 mile)
Coventry, MD (1.4 miles SW)
Fernshire Farms, MD (1.4 miles SW)
Parkridge, MD (1.4 miles W)
Parkridge Estates, MD (1.4 miles WNW)

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.