Baltimore, MD 21231 ZIP Code Profile

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Baltimore, MD

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ZIP Code 21231: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Baltimore, MD 21231

Not Acceptable, USPS
Patterson, MD 21231

  • ZIP Code Type: STANDARD
  • Businesses Addresses: 837
  • Single Family Addresses: 5,911
  • Multi-Family Addresses: 2,610
  • County: Baltimore City County
  • Centroid: Latitude 39.29, Longitude -76.594
  • 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.


21231 ZIP Code Map

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Baltimore, MD 21231 Data & Demographics (As of July 1, 2016)


Total Population 16,440
Population in Households 16,007
Population in Familes 8,562
Population in Group Qrtrs 433
Population Density1 15,238
Diversity Index2 70


Total Households 8,092
Average Household Size 1.98
Family Households 3,040
Average Family Size 3


Total Housing Units 9,566 (100%)
Owner Occupied HU 2,711 (28.3%)
Renter Occupied HU 5,381 (56.3%)
Vacant Housing Units 1,474 (15.4%)
Median Home Value $278,476
Average Home Value $340,483


Median Household Income $63,109
Average Household Income $89,331
Per Capita Income $44,737
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 0.63% 0.45%
Households 0.85% 0.61%
Families 0.51% 0.4%
Median Household Income   2.17%
Per Capita Income   2.25%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood 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.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.

Baltimore, MD 21231 - Peer Comparisons by Rank and Percentile

The table below compares 21231 to the other 455 ZIP Codes in Maryland by rank and percentile using July 1, 2016 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 # 139 70th
Population Density1 # 1 100th
Diversity Index2 # 48 90th
Median Household Income # 285 38th
Per Capita Income # 104 77th

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