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ZIP Code Database - Facts & Stats

Data Last Updated: December 1, 2022

ZIP Codes for City of Secretary, MD

Secretary, MD Covers 1 ZIP Code

ZIP CodeTypeCountyPopulation
ZIP Code 21664P.O. BoxDorchester539

Timezone(s):Eastern (GMT -05:00)
Population:535 (More Details)
Male Population:262
Female Population:273
Median Age:44
ZIP Codes:1
Area Codes:2
Total Area:983 square miles (county)
Land Area:541 square miles (county)
Water Area:442 square miles (county)

Secretary, MD Demographic Information *

Total population535
Male population262
Female population273
Median age (years)43.6
White Population473
Black Population34
Indian Population2
Asian Population1
Hawaiian Population0
Hispanic Population39
Median age (Male)41.8
Median age (Female)44.8
Total households213
Family households (families)157
Average household size2.51
Average family size2.86
Total housing units234
* Demographic data is based on 2010 Census. Products


  1. U.S. Postal Service [Last Updated: 12/1/2022],
  2. Internal Data Creation [Last Updated: 12/1/2022],
  3. U.S. Geological Survey [Updated as needed],
  4. U.S. Census [Updated Yearly],
  5. U.S. Census 2010 [Decennial] [Last Updated: 1/1/2010],