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Zip Code 21045 — Columbia, MD

21045 is a ZIP Code associated with Columbia, MD, located within Howard. The postal region supports an estimated population of 40,034 residents across Data Pending housing units, with a population density of 1,593.9 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (39.206220, -76.827470)

Data MetricLocal Statistic
Postal / Zip Code21045
Primary CityColumbia
State / ProvinceMD
CountyHoward
Total Population40,034
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density1,593.9 people/sq mi
TimezoneAmerica/New_York

How 21045 Compares

MetricZIP 21045Howard CountyMD State Average
Population40,034335,5126,205,597
Median IncomeData PendingN/AN/A
Population Density1,593.9 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 21046Columbia2.4 mi15,608N/A
Zip 21044Columbia3.0 mi44,114N/A
Zip 21043Ellicott City3.9 mi48,525N/A
Zip 21075Elkridge4.0 mi37,363N/A
Zip 20794Jessup4.3 mi16,814N/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 →