US Gazetteer > Maryland Gazetteer > Maryland ZIP Codes > Union Bridge, MD 21791

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Preferred Name, USPS
Union Bridge, MD 21791
Acceptable Alternative
Linwood, MD 21791

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ZIP Code 21791 has segments in 2 Counties / Independent Cities (Carroll, Frederick).

The 21791 ZIP Code is centered1 in Carroll County at latitude 39.545 and longitude -77.194 (Panoramio Photos). It is a standard type ZIP Code. Carroll County is in the Eastern Time Zone (UTC -5 hours) and observes daylight savings time.

The population in ZIP Code Tabulation Area (ZCTA) 21791 was 5,413 with 1,985 housing units; a land area land area of 48.81 sq. miles; a water area of 0 sq. miles; and a population density of 110.89 people per sq. mile for Census 2000. Demographic Profile

Union Bridge, MD 21791 Map (Marker is ZIP Code Centroid)

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Nearby Cities, Towns & Census Designated Places

Union Bridge, MD (1.9 miles NNE)
McKinstrys Mill, MD (1.9 miles ESE)
Clemsonville, MD (1.9 miles SSE)
Johnsville, MD (1.9 miles WSW)
Simpsons Mill, MD (3.1 miles NNW)
Linwood, MD (3.1 miles ENE)
Feesersburg, MD (3.4 miles N)
Oldfield, MD (3.4 miles S)
Bark Hill, MD (3.6 miles NE)
Middleburg, MD (3.6 miles NNW)

Nearby Neighborhoods, Subdivisions & Other Small Populated Places

Rabbit Run, MD (1.4 miles N)
Hidden Creek, MD (1.4 miles NW)
Bunker Hill Estates, MD (1.4 miles WNW)
Harmon Haven, MD (1.4 miles N)
Lovejoy Estates, MD (1.9 miles SSW)
Bethel, MD (1.9 miles NNW)
Bellevue Heights, MD (1.9 miles NE)
Quaker Heights, MD (1.9 miles NE)
Grossnickle, MD (2.4 miles WSW)
Mounts Scenic Acres, MD (2.7 miles WSW)

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.