Great Mills, MD 20634 ZIP Code Profile

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Great Mills, MD

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ZIP Code 20634: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Great Mills, MD 20634

  • ZIP Code Type: STANDARD
  • Businesses Addresses: 120
  • Single Family Addresses: 2,643
  • Multi-Family Addresses: 119
  • County: Saint Marys County
  • Centroid: Latitude 38.258, Longitude -76.494
  • 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.


20634 ZIP Code Map

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Great Mills, MD 20634 Data & Demographics (As of July 1, 2016)


Total Population 8,030
Population in Households 8,016
Population in Familes 6,604
Population in Group Qrtrs 14
Population Density1 1,138
Diversity Index2 65


Total Households 2,961
Average Household Size 2.71
Family Households 2,072
Average Family Size 3


Total Housing Units 3,220 (100%)
Owner Occupied HU 1,921 (59.7%)
Renter Occupied HU 1,040 (32.3%)
Vacant Housing Units 259 ( 8.0%)
Median Home Value $242,751
Average Home Value $247,046


Median Household Income $80,979
Average Household Income $91,180
Per Capita Income $33,684
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 1.33% 1.92%
Households 1.21% 1.79%
Families 1.08% 1.71%
Median Household Income   2.07%
Per Capita Income   1.76%
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.

Great Mills, MD 20634 - Peer Comparisons by Rank and Percentile

The table below compares 20634 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 # 199 56th
Population Density1 # 143 69th
Diversity Index2 # 63 86th
Median Household Income # 192 58th
Per Capita Income # 247 46th

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