Keymar, MD 21757 ZIP Code Profile

Related Place Profiles:
Detour, MD | Keymar, MD | Middleburg, MD

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ZIP Code 21757: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Keymar, MD 21757

Acceptable Alternative
Detour, MD 21757
Middleburg, MD 21757

  • ZIP Code Type: STANDARD
  • Businesses Addresses: 43
  • Single Family Addresses: 1,040
  • Multi-Family Addresses: 0
  • County: Carroll County
  • Centroid: Latitude 39.601, Longitude -77.254
  • Time Zone: Eastern Time Zone (UTC -5 hours)
  • Observes DST: Yes

ZIP Code 21757 has segments in 2 Counties / Independent Cities (Carroll, Frederick).

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.


21757 ZIP Code Map

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Keymar, MD 21757 Data & Demographics (As of July 1, 2016)


Total Population 3,374
Population in Households 3,335
Population in Familes 2,873
Population in Group Qrtrs 39
Population Density1 87
Diversity Index2 17


Total Households 1,221
Average Household Size 2.73
Family Households 940
Average Family Size 3


Total Housing Units 1,293 (100%)
Owner Occupied HU 934 (72.2%)
Renter Occupied HU 287 (22.2%)
Vacant Housing Units 72 ( 5.6%)
Median Home Value $300,495
Average Home Value $346,868


Median Household Income $65,520
Average Household Income $82,500
Per Capita Income $30,276
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 0.37% 0.53%
Households 0.44% 0.55%
Families 0.31% 0.48%
Median Household Income   2.75%
Per Capita Income   1.84%
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.

Keymar, MD 21757 - Peer Comparisons by Rank and Percentile

The table below compares 21757 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 # 268 41st
Population Density1 # 364 20th
Diversity Index2 # 379 17th
Median Household Income # 267 42nd
Per Capita Income # 291 36th

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