Home > MD > Howard County > Ellicott City > Zip 21042

Zip Code 21042 — Ellicott City, MD

21042 is a ZIP Code associated with Ellicott City, MD, located within Howard. The postal region supports an estimated population of 43,327 residents across Data Pending housing units, with a population density of 452.1 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (39.271050, -76.892400)

Data MetricLocal Statistic
Postal / Zip Code21042
Primary CityEllicott City
State / ProvinceMD
CountyHoward
Total Population43,327
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density452.1 people/sq mi
TimezoneAmerica/New_York

How 21042 Compares

MetricZIP 21042Howard CountyMD State Average
Population43,327335,5126,205,597
Median IncomeData PendingN/AN/A
Population Density452.1 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 21044Columbia4.2 mi44,114N/A
Zip 21794West Friendship4.7 mi2,192N/A
Zip 21163Woodstock5.1 mi7,539N/A
Zip 21043Ellicott City5.1 mi48,525N/A
Zip 21029Clarksville5.5 mi13,607N/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 →