US Gazetteer > Maryland Gazetteer > Maryland ZIP Codes > Columbia, MD 21045

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Columbia, MD 21045

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The 21045 ZIP Code is centered1 in Howard County at latitude 39.204 and longitude -76.834 (Panoramio Photos). It is a standard type ZIP Code. Howard County is in the Eastern Time Zone (UTC -5 hours) and observes daylight savings time.

The population in ZIP Code Tabulation Area (ZCTA) 21045 was 37,519 with 14,704 housing units; a land area land area of 10.27 sq. miles; a water area of 0.05 sq. miles; and a population density of 3,653.67 people per sq. mile for Census 2000. Demographic Profile

Columbia, MD 21045 Map (Marker is ZIP Code Centroid)

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Nearby Cities, Towns & Census Designated Places

Oakland Mills, MD (1.4 miles NNW)
Jonestown, MD (1.9 miles NE)
Pfeiffer Corners, MD (2.4 miles ESE)
Glenmar, MD (2.4 miles NE)
Guilford, MD (2.4 miles S)
Columbia, MD (2.4 miles N)
Simpsonville, MD (2.7 miles WSW)
Waterloo, MD (3.4 miles SE)
Worthington, MD (3.6 miles NE)
Elioak, MD (3.6 miles NW)

Nearby Neighborhoods, Subdivisions & Other Small Populated Places

Sewells Orchard, MD (< 0.1 mile)
Jeffers Hill, MD (< 0.1 mile)
Stevens Forest, MD (< 0.1 mile)
Talbott Springs, MD (< 0.1 mile)
Locust Park, MD (< 0.1 mile)
 Long Reach, MD (1.4 miles NE)
Phelps Luck, MD (1.4 miles NE)
Glenmont, MD (1.4 miles NNE)
Dasher Green, MD (1.4 miles SW)
Allview Estates, MD (1.4 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.