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Zip Code 20899 — Gaithersburg, MD

ZIP Code 20899 is associated with Gaithersburg, MD, in Montgomery County. The listed population estimate is 57; estimated density is 207.6 people per square mile. Among records with population estimates, it ranks #46 of 46 in Montgomery County and #457 of 470 in MD.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (39.144420, -77.216210)

Data MetricLocal Statistic
Postal / Zip Code20899
Primary CityGaithersburg
State / ProvinceMD
CountyMontgomery
Total Population57
Population Density207.6 people/sq mi
TimezoneAmerica/New_York

How 20899 Compares

MetricZIP 20899Montgomery County recordsMD records
Population estimate571,076,754 (sum)6,205,597 (sum)
Population Density207.6 /sq mi----
County population rank#46 of 46----
State population rank#457 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 20877Gaithersburg1.5 mi38,546
ZIP 20880Washington Grove2.2 mi577
ZIP 20886Montgomery Village2.6 mi34,718
ZIP 20878Gaithersburg2.7 mi66,115
ZIP 20879Gaithersburg2.9 mi25,264

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 →