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Zip Code 21555 — Oldtown, MD

21555 is a ZIP Code associated with Oldtown, MD, located within Allegany. The postal region supports an estimated population of 1,470 residents across Data Pending housing units, with a population density of 5.8 people per square mile.

WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (39.587770, -78.556850)

Data Metric	Local Statistic
Postal / Zip Code	21555
Primary City	Oldtown
State / Province	MD
County	Allegany
Total Population	1,470
Median Household Income	Data Pending
Total Housing Units	Data Pending
Population Density	5.8 people/sq mi
Timezone	America/New_York

How 21555 Compares

Metric	ZIP 21555	Allegany County	MD State Average
Population	1,470	66,188	6,205,597
Median Income	Data Pending	N/A	N/A
Population Density	5.8 /sq mi	--	--

Nearby ZIP Codes

ZIP Code	City	Distance	Population	Median Income
Zip 21530	Flintstone	7.0 mi	1,404	N/A
Zip 21560	Spring Gap	8.1 mi	9	N/A
Zip 21766	Little Orleans	9.8 mi	854	N/A
Zip 21502	Cumberland	11.2 mi	41,015	N/A
Zip 21529	Ellerslie	14.6 mi	514	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 →