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Zip Code 20877 — Gaithersburg, MD

ZIP Code 20877 is associated with Gaithersburg, MD, in Montgomery County. The listed population estimate is 38,546; estimated density is 2,638.4 people per square mile. Among records with population estimates, it ranks #10 of 46 in Montgomery County and #50 of 470 in MD.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (39.140680, -77.188650)

Data MetricLocal Statistic
Postal / Zip Code20877
Primary CityGaithersburg
State / ProvinceMD
CountyMontgomery
Total Population38,546
Population Density2,638.4 people/sq mi
TimezoneAmerica/New_York

How 20877 Compares

MetricZIP 20877Montgomery County recordsMD records
Population estimate38,5461,076,754 (sum)6,205,597 (sum)
Population Density2,638.4 /sq mi----
County population rank#10 of 46----
State population rank#50 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 20880Washington Grove0.8 mi577
ZIP 20899Gaithersburg1.5 mi57
ZIP 20879Gaithersburg2.2 mi25,264
ZIP 20886Montgomery Village2.7 mi34,718
ZIP 20855Derwood3.0 mi17,279

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 →