Conowingo, MD 21918 ZIP Code Profile

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Conowingo, MD

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ZIP Code 21918: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Conowingo, MD 21918

  • ZIP Code Type: STANDARD
  • County: Cecil County
  • Centroid: Latitude 39.676, Longitude -76.153
  • Time Zone: Eastern Time Zone (UTC -5 hours)
  • Observes DST: Yes
  • Businesses Addresses: 46
  • PO Box Addresses: 146
  • Residential Addresses: 1,495
    • Multi-Family Addresses: 0
    • Single Family Addresses: 1,495

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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21918 ZIP Code Map

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Conowingo, MD 21918 Data & Demographics (As of July 1, 2017)


Total Population 4,793
Daytime Population: Workers 452
Daytime Population: Residents 2,388
Total Daytime Population (TDP) 2,840
Ratio TDP/Total Population1 0.59
Population in Households 4,778
Population in Familes 4,199
Population in Group Qrtrs 15
Population Density2 268
Diversity Index3 15


Median Household Income $86,271
Average Household Income $94,689
Per Capita Income $33,070


Total Housing Units 1,777 (100%)
Owner Occupied HU 1,448 (81.5%)
Renter Occupied HU 220 (12.4%)
Vacant Housing Units 109 ( 6.1%)
Median Home Value $278,211
Average Home Value $285,998


Total Households 1,668
Average Household Size 2.86
Family Households 1,323
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 0.49% 0.35%
Households 0.44% 0.32%
Families 0.35% 0.24%
Median Household Income   1.91%
Per Capita Income   2.4%

Conowingo, MD 21918 - Peer Comparisons by Rank and Percentile

The table below compares 21918 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 # 243 47th
Population Density # 269 41st
Diversity Index # 405 11th
Median Household Income # 180 61st
Per Capita Income # 266 42nd

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

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