Columbia, MD 21045 ZIP Code Profile

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Columbia, MD

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ZIP Code 21045: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Columbia, MD 21045

  • ZIP Code Type: STANDARD
  • Businesses Addresses: 1,720
  • Single Family Addresses: 12,289
  • Multi-Family Addresses: 2,845
  • County: Howard County
  • Centroid: Latitude 39.204, Longitude -76.834
  • Time Zone: Eastern Time Zone (UTC -5 hours)
  • Observes DST: Yes

Neighborhood Data

Address Based Hyperlocal Data Input an address and get data & demographics for the pertinent census block group (CBG), a searchable map and a customized directory. The CBG is the smallest geographical unit used by the Census Bureau for reporting certain data.


21045 ZIP Code Map

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Columbia, MD 21045 Data & Demographics (As of July 1, 2017)


Total Population 40,307
Daytime Population: Workers 20,394
Daytime Population: Residents 18,915
Total Daytime Population (TDP) 39,309
Ratio TDP/Total Population1 0.98
Population in Households 40,224
Population in Familes 32,857
Population in Group Qrtrs 83
Population Density2 4,180
Diversity Index3 76


Median Household Income $96,334
Average Household Income $112,206
Per Capita Income $42,945


Total Housing Units 16,007 (100%)
Owner Occupied HU 10,424 (65.1%)
Renter Occupied HU 4,976 (31.1%)
Vacant Housing Units 607 ( 3.8%)
Median Home Value $355,770
Average Home Value $369,527


Total Households 15,400
Average Household Size 2.61
Family Households 10,401
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 0.68% 0.92%
Households 0.56% 0.87%
Families 0.36% 0.72%
Median Household Income   1.27%
Per Capita Income   2.13%

Columbia, MD 21045 - Peer Comparisons by Rank and Percentile

The table below compares 21045 to the other 456 ZIP Codes in Maryland by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 38 92nd
Population Density # 58 88th
Diversity Index # 29 94th
Median Household Income # 140 70th
Per Capita Income # 140 70th

Additional comparisons and rankings can be made with a VERY EASY TO USE Maryland Census Data Comparison Tool.

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