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: 272
  • Residential Addresses: 2,768
    • Multi-Family Addresses: 119
    • Single Family Addresses: 2,649

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.


20634 ZIP Code Map

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Great Mills, MD 20634 Data & Demographics (As of July 1, 2017)


Total Population 7,910
Daytime Population: Workers 2,394
Daytime Population: Residents 3,479
Total Daytime Population (TDP) 5,873
Ratio TDP/Total Population1 0.74
Population in Households 7,897
Population in Familes 6,505
Population in Group Qrtrs 13
Population Density2 1,054
Diversity Index3 65


Median Household Income $82,042
Average Household Income $93,568
Per Capita Income $34,330


Total Housing Units 3,126 (100%)
Owner Occupied HU 1,908 (61.0%)
Renter Occupied HU 989 (31.6%)
Vacant Housing Units 229 ( 7.3%)
Median Home Value $263,788
Average Home Value $272,288


Total Households 2,897
Average Household Size 2.73
Family Households 2,029
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 1.24% 1.81%
Households 1.16% 1.67%
Families 1.04% 1.59%
Median Household Income   1.49%
Per Capita Income   2.41%

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

The table below compares 20634 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 # 200 56th
Population Density # 155 66th
Diversity Index # 67 86th
Median Household Income # 195 57th
Per Capita Income # 251 45th

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

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