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Zip Code 21664 — Secretary, MD

21664 is a ZIP Code associated with Secretary, MD, located within Dorchester. The postal region supports an estimated population of 635 residents across Data Pending housing units, with a population density of 841.8 people per square mile.

WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (38.608100, -75.947320)

Data Metric	Local Statistic
Postal / Zip Code	21664
Primary City	Secretary
State / Province	MD
County	Dorchester
Total Population	635
Median Household Income	Data Pending
Total Housing Units	Data Pending
Population Density	841.8 people/sq mi
Timezone	America/New_York

How 21664 Compares

Metric	ZIP 21664	Dorchester County	MD State Average
Population	635	31,256	6,205,597
Median Income	Data Pending	N/A	N/A
Population Density	841.8 /sq mi	--	--

Nearby ZIP Codes

ZIP Code	City	Distance	Population	Median Income
Zip 21631	East New Market	1.4 mi	2,429	N/A
Zip 21643	Hurlock	4.8 mi	5,392	N/A
Zip 21835	Linkwood	5.2 mi	312	N/A
Zip 21673	Trappe	5.9 mi	2,843	N/A
Zip 21659	Rhodesdale	8.3 mi	1,601	N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →