Preston, MD 21655 ZIP Code Profile

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Preston, MD

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ZIP Code 21655: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Preston, MD 21655

  • ZIP Code Type: STANDARD
  • County: Caroline County
  • Centroid: Latitude 38.735, Longitude -75.905
  • Time Zone: Eastern Time Zone (UTC -5 hours)
  • Observes DST: Yes
  • Businesses Addresses: 123
  • PO Box Addresses: 329
  • Residential Addresses: 1,837
    • Multi-Family Addresses: 0
    • Single Family Addresses: 1,837

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

EXTREMELY LOCAL Demographic Data

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21655 ZIP Code Map

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Preston, MD 21655 Data & Demographics (As of July 1, 2017)


Total Population 4,916
Daytime Population: Workers 577
Daytime Population: Residents 2,142
Total Daytime Population (TDP) 2,719
Ratio TDP/Total Population1 0.55
Population in Households 4,916
Population in Familes 4,172
Population in Group Qrtrs 0
Population Density2 92
Diversity Index3 33


Median Household Income $57,611
Average Household Income $71,615
Per Capita Income $27,416


Total Housing Units 2,158 (100%)
Owner Occupied HU 1,532 (71.0%)
Renter Occupied HU 350 (16.2%)
Vacant Housing Units 276 (12.8%)
Median Home Value $219,825
Average Home Value $263,071


Total Households 1,882
Average Household Size 2.61
Family Households 1,388
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 -0.17% -0.04%
Households -0.2% -0.06%
Families -0.29% -0.14%
Median Household Income   1.44%
Per Capita Income   2.8%

Preston, MD 21655 - Peer Comparisons by Rank and Percentile

The table below compares 21655 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 # 242 47th
Population Density # 366 20th
Diversity Index # 276 40th
Median Household Income # 342 25th
Per Capita Income # 357 22nd

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

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