Zip Code 20877
Gaithersburg, Maryland — Montgomery County
📍 ZIP code 20877 is in Gaithersburg, Montgomery County, Maryland.
ZIP code 20877 is located in Gaithersburg, Montgomery County, Maryland. It is a zip code in the Eastern (EST/EDT) Time Zone with an estimated population of 39,068. The area code for ZIP code 20877 is 301.
Quick Answer
Zip code 20877 is in Gaithersburg, Maryland (Montgomery County). It has a population of 39,068, median household income of $86,103, and median home value of $462,500.
Population
39,068
Income
$86,103
Home Value
$462,500
Climate
87°F / 27°F
About Zip Code 20877
Zip code 20877 is located in Gaithersburg, Maryland, within Montgomery County. Home to approximately 39,068 residents, this area sits at an elevation of 516 ft and falls within the Eastern (EST/EDT) timezone. The local area code is 301.
The median household income is $86,103 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $462,500, and the cost of living index is 141 (41% above the national average of 100).
Summers average a high of 87°F while winters drop to 27°F. The area receives about 41 in of rain and 9 in of snow annually. The zip code covers 5.8 square miles of land area.
Key Statistics
39,068
$86,103
$462,500
Eastern (EST/EDT)
301
516 ft
5.8 sq mi
37.2
13,599
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Compare With Nearby Zip Codes
| Metric | 20877 | 20880 | 20879 | 20855 | 20886 | 20850 |
|---|---|---|---|---|---|---|
| City | Gaithersburg, MD | Washington Grove, MD | Montgomery Village, MD | Derwood, MD | Montgomery Village, MD | Rockville, MD |
| Population | 39,068 | 590 | 26,120 | 16,557 | 34,419 | 50,365 |
| Median Income | $86,103 | $160,417 | $105,109 | $147,708 | $98,767 | $122,691 |
| Home Value | $462,500 | $594,200 | $433,500 | $614,900 | $366,400 | $687,200 |
| Cost of Living | 141 | 192 | 142 | 206 | 126 | 209 |
| Median Age | 37.2 | 58.9 | 36.3 | 41.8 | 38.1 | 40.8 |
Cost of Living
100 = National Average. Gaithersburg's cost of living is 41% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
5.4x
Demographics
Zip code 20877 has a population of 39,068 people with a median age of 37.2. There are 13,599 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Gaithersburg (20877) population trend from 2010 to 2024
↑ 126.7%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
87°F
27°F
41 in
9 in
Gaithersburg experiences warm summers with average highs around 87°F. Winters are cool with lows averaging 27°F. The area receives about 9 in of snow per year.
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Housing & Economy
Median Home Value
$462,500
Median Household Income
$86,103
With 13,599 housing units across 5.8 square miles, 20877 has a housing density of 2,345 units per square mile. The home price-to-income ratio is 5.4x.
Location & Geography
Latitude
39.1406°
Longitude
-77.1921°
Land Area
5.8 sq mi
Water Area
0 sq mi
Nearby Zip Codes
Zip codes closest to 20877 (Gaithersburg, MD) with distances:
All Zip Codes in Gaithersburg, MD
Other zip codes serving Gaithersburg:
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ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 20877's $86,103. A way to compare Gaithersburg to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 20877 (Gaithersburg, MD). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is Gaithersburg, Maryland?
Gaithersburg, Maryland uses zip code 20877 along with 1 other zip codes.
What county is zip code 20877 in?
Zip code 20877 is located in Montgomery County, Maryland.
What is the population of zip code 20877?
The population of zip code 20877 is 39,068 with a median age of 37.2.
Is 20877 in Gaithersburg, Maryland?
Yes, zip code 20877 is in Gaithersburg, Montgomery County, Maryland. The area code is 301.
Frequently Asked Questions
What city is zip code 20877 in?
Zip code 20877 is in Gaithersburg, Maryland. It is part of Montgomery County and uses the Eastern (EST/EDT) timezone.
What is zip code 20877?
Zip code 20877 is a U.S. postal code in Gaithersburg, Maryland (Montgomery County). It has a population of 39,068 and covers 5.8 square miles.
What is the population of zip code 20877?
The population of zip code 20877 (Gaithersburg, MD) is 39,068 with a median age of 37.2. There are approximately 13,599 housing units in this area.
What is the median income in zip code 20877?
The median household income in zip code 20877 (Gaithersburg, MD) is $86,103 per year. The cost of living index is 141 (100 = national average).
What is the average home price in zip code 20877?
The median home value in zip code 20877 (Gaithersburg, MD) is $462,500. The cost of living index is 141 compared to the national average of 100.
What county is zip code 20877 in?
Zip code 20877 is located in Montgomery County, Maryland. The primary city is Gaithersburg.
What is the area code for zip code 20877?
Zip code 20877 in Gaithersburg, MD uses area code 301. It is located in the Eastern (EST/EDT) timezone.
Is zip code 20877 a good place to live?
Zip code 20877 (Gaithersburg, MD) has a cost of living index of 141 (100 = national average), a median household income of $86,103, and median home values of $462,500. The median age is 37.2. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 20877?
The cost of living index for zip code 20877 (Gaithersburg, MD) is 141, where 100 represents the national average. This area is above the national average. Median home value: $462,500.
What schools serve zip code 20877?
Zip code 20877 in Gaithersburg, Maryland is served by the local school district of Montgomery County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.