Westminster, MD 21158 ZIP Code Profile

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Westminster, MD

ZIP Code 21158: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Westminster, MD 21158

  • ZIP Code Type: STANDARD
  • County: Carroll County
  • Centroid: Latitude 39.64, Longitude -77.03
  • Time Zone: Eastern Time Zone (UTC -5 hours)
  • Observes DST: Yes
  • Businesses Addresses: 584
  • PO Box Addresses: 584
  • Residential Addresses: 7,751
    • Multi-Family Addresses: 747
    • Single Family Addresses: 7,004

The ZIP Code maps and database are updated 4 times per year.
Database updated: May 1, 2018, Maps updated: February 1, 2018.

EXTREMELY LOCAL Demographic 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 demographic data.


21158 ZIP Code Map

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Westminster, MD 21158 Data & Demographics (As of July 1, 2017)


Total Population 19,968
Daytime Population: Workers 3,436
Daytime Population: Residents 9,033
Total Daytime Population (TDP) 12,469
Ratio TDP/Total Population1 0.62
Population in Households 19,843
Population in Familes 17,205
Population in Group Qrtrs 125
Population Density2 278
Diversity Index3 21


Median Household Income $82,700
Average Household Income $97,133
Per Capita Income $35,484


Total Housing Units 7,704 (100%)
Owner Occupied HU 5,730 (74.4%)
Renter Occupied HU 1,519 (19.7%)
Vacant Housing Units 455 ( 5.9%)
Median Home Value $320,739
Average Home Value $352,024


Total Households 7,249
Average Household Size 2.74
Family Households 5,458
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 0.07% 0.21%
Households 0.04% 0.19%
Families -0.07% 0.12%
Median Household Income   1.61%
Per Capita Income   2.34%

Westminster, MD 21158 - Peer Comparisons by Rank and Percentile

The table below compares 21158 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 # 127 72nd
Population Density # 263 43rd
Diversity Index # 365 20th
Median Household Income # 191 58th
Per Capita Income # 235 49th

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

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