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Zip Code 21157 — Westminster, MD

ZIP Code 21157 is associated with Westminster, MD, in Carroll County. The listed population estimate is 38,984; estimated density is 193.7 people per square mile. Among records with population estimates, it ranks #2 of 9 in Carroll County and #47 of 470 in MD.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (39.548890, -76.981620)

Data MetricLocal Statistic
Postal / Zip Code21157
Primary CityWestminster
State / ProvinceMD
CountyCarroll
Total Population38,984
Population Density193.7 people/sq mi
TimezoneAmerica/New_York

How 21157 Compares

MetricZIP 21157Carroll County recordsMD records
Population estimate38,984158,322 (sum)6,205,597 (sum)
Population Density193.7 /sq mi----
County population rank#2 of 9----
State population rank#47 of 470----

Regional sums combine the population estimates in the listed ZIP records; they are not official county or state population totals.

Explore More ZIP Codes

Nearby ZIP Codes in MD

ZIP CodeCityDistancePopulation estimate
ZIP 21048Finksburg5.3 mi10,481
ZIP 21776New Windsor6.8 mi6,261
ZIP 21158Westminster7.3 mi22,083
ZIP 21074Hampstead8.7 mi14,777
ZIP 21155Upperco9.5 mi3,313

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 →