Home > MD > Montgomery County > Gaithersburg > Zip 20877

Zip Code 20877 — Gaithersburg, MD

20877 is a ZIP Code associated with Gaithersburg, MD, located within Montgomery. The postal region supports an estimated population of 38,546 residents across Data Pending housing units, with a population density of 2,638.4 people per square mile.

WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (39.140680, -77.188650)

Data Metric	Local Statistic
Postal / Zip Code	20877
Primary City	Gaithersburg
State / Province	MD
County	Montgomery
Total Population	38,546
Median Household Income	Data Pending
Total Housing Units	Data Pending
Population Density	2,638.4 people/sq mi
Timezone	America/New_York

How 20877 Compares

Metric	ZIP 20877	Montgomery County	MD State Average
Population	38,546	1,076,754	6,205,597
Median Income	Data Pending	N/A	N/A
Population Density	2,638.4 /sq mi	--	--

Nearby ZIP Codes

ZIP Code	City	Distance	Population	Median Income
Zip 20880	Washington Grove	0.8 mi	577	N/A
Zip 20899	Gaithersburg	1.5 mi	57	N/A
Zip 20879	Gaithersburg	2.2 mi	25,264	N/A
Zip 20886	Montgomery Village	2.7 mi	34,718	N/A
Zip 20855	Derwood	3.0 mi	17,279	N/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 →