Great Mills, MD 20634 ZIP Code Profile

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Great Mills, MD

ZIP Code 20634: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Great Mills, MD 20634

  • ZIP Code Type: STANDARD
  • County: Saint Marys County
  • Centroid: Latitude 38.258, Longitude -76.494
  • Time Zone: Eastern Time Zone (UTC -5 hours)
  • Observes DST: Yes
  • Businesses Addresses: 115
  • PO Box Addresses: 248
  • Residential Addresses: 2,758
    • Multi-Family Addresses: 119
    • Single Family Addresses: 2,639

The ZIP Code maps and database are updated 4 times per year.
Database updated: February 1, 2019, Maps updated: February 1, 2019.

Jump to... (On This Page!)
  1. 20634 2018 Demographic Data
  2. Growth Rates for 20634 (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. Maryland Research Tools (Easy Tools & Current Data)
  3. Maryland Data Comparison Tool - 2018 Demographics

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Boundary Maps, Demographic Data, School Zones Review maps and data for the neighborhood, city, county, ZIP Code, and school zone. July 1, 2018, data includes home values, household income, percentage of homes owned, rented or vacant, etc.


Great Mills, MD 20634 Data & Demographics (As of July 1, 2018)


Total Population 8,677
Population in Households 8,662
Population in Familes 7,179
Population in Group Qrtrs 15
Population Density2 1,102
Diversity Index3 65


Median Household Income $85,785
Average Household Income $97,853
Per Capita Income $36,172


Total Housing Units 3,490 (100%)
Owner Occupied HU 2,088 (59.8%)
Renter Occupied HU 1,114 (31.9%)
Vacant Housing Units 288 ( 8.3%)
Median Home Value $274,307
Average Home Value $276,808


Total Households 3,202
Average Household Size 2.71
Family Households 2,241
Average Family Size 3
  1. Demographics are point estimates for July 1st of the current year and each for the forecast years. See References for more information.
  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.


2010-2018 2018-2023
Population 1.2% 1.41%
Households 1.12% 1.33%
Families 0.98% 1.23%
Median Household Income   2.87%
Per Capita Income   3.16%

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

The table below compares 20634 to the other 448 ZIP Codes in Maryland by rank and percentile using July 1, 2018 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 # 195 57th
Population Density # 147 67th
Diversity Index # 70 85th
Median Household Income # 192 57th
Per Capita Income # 239 47th

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

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