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Zip Code 21648 — Madison, MD

21648 is a ZIP Code associated with Madison, MD, located within Dorchester. The postal region supports an estimated population of 172 residents across Data Pending housing units, with a population density of 7.1 people per square mile.

WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (38.496600, -76.233860)

Data Metric	Local Statistic
Postal / Zip Code	21648
Primary City	Madison
State / Province	MD
County	Dorchester
Total Population	172
Median Household Income	Data Pending
Total Housing Units	Data Pending
Population Density	7.1 people/sq mi
Timezone	America/New_York

How 21648 Compares

Metric	ZIP 21648	Dorchester County	MD State Average
Population	172	31,256	6,205,597
Median Income	Data Pending	N/A	N/A
Population Density	7.1 /sq mi	--	--

Nearby ZIP Codes

ZIP Code	City	Distance	Population	Median Income
Zip 21677	Woolford	2.7 mi	436	N/A
Zip 21669	Taylors Island	3.8 mi	160	N/A
Zip 21622	Church Creek	6.9 mi	420	N/A
Zip 21613	Cambridge	8.8 mi	17,926	N/A
Zip 21626	Crapo	13.6 mi	256	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 →