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Zip Code 21738 — Glenwood, MD

ZIP Code 21738 is associated with Glenwood, MD, in Howard County. The listed population estimate is 3,696; estimated density is 204.5 people per square mile. Among records with population estimates, it ranks #13 of 20 in Howard County and #258 of 470 in MD.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (39.279730, -77.025540)

Data MetricLocal Statistic
Postal / Zip Code21738
Primary CityGlenwood
State / ProvinceMD
CountyHoward
Total Population3,696
Population Density204.5 people/sq mi
TimezoneAmerica/New_York

How 21738 Compares

MetricZIP 21738Howard County recordsMD records
Population estimate3,696335,512 (sum)6,205,597 (sum)
Population Density204.5 /sq mi----
County population rank#13 of 20----
State population rank#258 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 21737Glenelg1.8 mi2,474
ZIP 21794West Friendship3.0 mi2,192
ZIP 21036Dayton3.4 mi2,569
ZIP 21723Cooksville3.4 mi669
ZIP 21797Woodbine4.4 mi8,643

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 →