20877 ZIP Code — Gaithersburg, MD
Montgomery County, Maryland
ZIP code 20877 is located in Gaithersburg, Maryland, within Montgomery County. It covers approximately 5.64 square miles and serves a population of 38,524 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 301/240.
About ZIP code 20877
The housing stock consists of a significant share of large multi-unit buildings. Most homes were built in the 1970s, giving the area an established character. Median home value is $442,300. Renters make up the majority at 56%, typical of denser urban areas.
Median household income is $86,134. SNAP benefit usage at 18% of households reflects economic stress in the area.
The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 32 minutes is near the national average.
Educational attainment is near the national average, with 36% of residents holding a bachelor's degree or higher.
19% of residents lack health insurance, above the national average.
Notable community characteristics include Spanish spoken in 36% of households.
38,524
population
5.64
sq mi land
Standard
ZIP type
Eastern (ET)
timezone
20877 ZIP code map
Cities in ZIP code 20877
Below are the cities the US Postal Service accepts for ZIP code 20877. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Gaithersburg | Acceptable |
| Gaithersburg | Preferred |
Nearby ZIP codes
20899 Gaithersburg (1.2 mi)
20855 Derwood (2.3 mi)
20886 Montgomery Village (2.5 mi)
20879 Gaithersburg (2.6 mi)
20850 Rockville (3.5 mi)
20878 Gaithersburg (4 mi)
20857 Rockville (4.1 mi)
20853 Rockville (4.9 mi)
20851 Rockville (5.2 mi)
20876 Germantown (5.7 mi)
20874 Germantown (5.8 mi)
20832 Olney (5.9 mi)
Demographics
updated 05/2026
| Population | |
|---|---|
| Total population | 38,524 |
| Population density | 6,830 / sq mi |
| State FIPS | 24 |
| County FIPS | 031 |
| Geography | |
|---|---|
| Land area | 5.64 sq mi |
| Water area | 0.03 sq mi |
| Latitude | 39.1393 |
| Longitude | -77.1805 |
| Timezone | Eastern (ET) |
| Area code | 301/240 |
Total population by age
Gender
Race & ethnicity
Economics
updated 05/2026
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 32.4% | 20.6% | 28.2% |
| $50k – $100k | 29.5% | 24.2% | 28.2% |
| $100k – $200k | 30.8% | 31.9% | 30.1% |
| Over $200k | 7.3% | 23.3% | 13.4% |
Demographics & statistics
38,524
Population
6,830
People per sq mi
36.9
Median age
$86,134
Median household income
$35,947
Per capita income
$442,300
Median home value
$1,838
Median monthly rent
43.6%
Home ownership
13.2%
Poverty rate
7.2%
Unemployment
6,368
Housing units
35.6%
Bachelor's or higher
Age distribution
Male
Female
1,552
Under 5
1,541
1,175
5–9
1,166
1,205
10–14
1,197
1,183
15–19
1,174
1,305
20–24
1,295
2,543
25–34
2,526
3,118
35–44
3,096
2,470
45–54
2,452
1,022
55–59
1,014
867
60–64
860
1,532
65–74
1,521
795
75–84
790
564
85+
561
← Male
Female →
Age summary
| Group | Count | % |
|---|---|---|
| Under 18 | 9,278 | 24.1% |
| 18 and over | 29,246 | 75.9% |
| 65 and over | 5,763 | 15.0% |
| Median age | 36.9 years | |
Race & ethnicity
Hispanic or Latino
24.9%
White
21.5%
Other race
19.5%
Black or African American
13.9%
Asian
12.1%
Two or more races
7.5%
American Indian / Alaska Native
0.4%
Native Hawaiian / Pacific Islander
0.2%
| Group | Count | % |
|---|---|---|
| Hispanic or Latino | 12,742 | 24.9% |
| White | 11,034 | 21.5% |
| Other race | 9,991 | 19.5% |
| Black or African American | 7,140 | 13.9% |
| Asian | 6,188 | 12.1% |
| Two or more races | 3,838 | 7.5% |
| American Indian / Alaska Native | 207 | 0.4% |
| Native Hawaiian / Pacific Islander | 126 | 0.2% |
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 32.4% | 20.6% | 28.2% |
| $50k – $100k | 29.5% | 24.2% | 28.2% |
| $100k – $200k | 30.8% | 31.9% | 30.1% |
| Over $200k | 7.3% | 23.3% | 13.4% |
Under $10k
4.9%
$10k–$15k
2.3%
$15k–$25k
5.6%
$25k–$35k
6.5%
$35k–$50k
11.9%
$50k–$75k
13.7%
$75k–$100k
11.7%
$100k–$150k
21.3%
$150k–$200k
10.9%
$200k+
11.1%
| Range | % of households |
|---|---|
| Under $10k | 4.9% |
| $10k–$15k | 2.3% |
| $15k–$25k | 5.6% |
| $25k–$35k | 6.5% |
| $35k–$50k | 11.9% |
| $50k–$75k | 13.7% |
| $75k–$100k | 11.7% |
| $100k–$150k | 21.3% |
| $150k–$200k | 10.9% |
| $200k+ | 11.1% |
| Median income | $86,134 |
Housing
Home values
Under $50k
1.7%
$50k–$100k
0.7%
$100k–$150k
2.9%
$150k–$200k
2.6%
$200k–$300k
9.2%
$300k–$500k
52.2%
$500k–$1M
30.6%
$1M+
0.1%
Housing overview
| Metric | Value |
|---|---|
| Median home value | $442,300 |
| Median rent / month | $1,838 |
| Owner occupied | 43.6% |
| Renter occupied | 56.4% |
| Vacant | 6.5% |
| Single-family detached | 25.0% |
| Large apartment buildings | 24.5% |
| Mobile homes | 0.1% |
| Median rooms | 5.0 |
| Avg household size (owned) | 3.43 |
Year built
| Era | % |
|---|---|
| 2020 or later | 0.6% |
| 2010–2019 | 11.8% |
| 2000–2009 | 16.3% |
| 1990–1999 | 10.4% |
| 1980–1989 | 19.8% |
| 1970–1979 | 20.7% |
| 1960–1969 | 9.7% |
| 1950–1959 | 6.3% |
| 1940–1949 | 1.7% |
| 1939 or earlier | 2.6% |
Bedrooms
| Size | % of units |
|---|---|
| No bedroom (studio) | 4.3% |
| 1 bedroom | 19.7% |
| 2 bedrooms | 25.8% |
| 3 bedrooms | 28.3% |
| 4 bedrooms | 16.0% |
| 5+ bedrooms | 5.9% |
Vehicles per household
| Vehicles | % of households |
|---|---|
| No vehicle | 12.5% |
| 1 vehicle | 37.6% |
| 2 vehicles | 28.6% |
| 3 or more | 21.3% |
Heating fuel
| Fuel type | % |
|---|---|
| Utility gas | 43.9% |
| Electricity | 51.5% |
| Propane / LP gas | 1.2% |
| Fuel oil | 1.6% |
| Wood | 0.2% |
| Solar | 0.2% |
| No fuel used | 1.0% |
Households & families
| Household type | Count | % |
|---|---|---|
| Married-couple family | 6,095 | 48.4% |
| Cohabiting couple | 843 | 6.7% |
| Male householder, no spouse | 1,832 | 14.5% |
| Female householder, no spouse | 3,830 | 30.4% |
| Households with children under 18 | 4,638 | 36.8% |
| Households with seniors (65+) | 3,809 | 30.2% |
| Average household size | 3.04 | |
Marital status
| Status | Male | Female |
|---|---|---|
| Never married | 38.8% | 34.9% |
| Married | 51.2% | 44.8% |
| Separated | 1.0% | 1.6% |
| Widowed | 3.0% | 8.0% |
| Divorced | 6.1% | 10.6% |
Education
Less than 9th grade
16.2%
Some HS, no diploma
6.0%
HS graduate
22.2%
Some college, no degree
13.8%
Associate's degree
6.2%
Bachelor's degree
20.8%
Graduate / professional
14.8%
| Metric | % |
|---|---|
| HS diploma or higher | 77.8% |
| Bachelor's or higher | 35.6% |
School enrollment (ages 3–17)
| Type | Count | % |
|---|---|---|
| Nursery / preschool | 635 | 6.9% |
| Kindergarten | 423 | 4.6% |
| Elementary school | 3,728 | 40.8% |
| High school | 2,145 | 23.5% |
| College / grad school | 2,212 | 24.2% |
Employment
Industry of employment
Education & healthcare
18.2%
Professional & management
17.5%
Construction
13.5%
Arts, food & hospitality
10.6%
Retail trade
9.9%
Public administration
7.7%
Other services
7.3%
Manufacturing
4.7%
Finance & real estate
4.1%
Transportation & utilities
3.5%
Wholesale trade
1.8%
Information
1.0%
Agriculture & mining
0.2%
Occupation
| Category | % |
|---|---|
| Management, business & arts | 35.1% |
| Service | 26.5% |
| Sales & office | 15.7% |
| Natural resources & construction | 13.0% |
| Production & transportation | 9.7% |
Employment type
| Type | % |
|---|---|
| Private sector | 79.8% |
| Government | 15.0% |
| Self-employed | 4.4% |
| Unpaid family workers | 0.7% |
Commute
| Method | % |
|---|---|
| Drive alone | 57.5% |
| Carpool | 14.9% |
| Public transit | 9.7% |
| Walk | 1.2% |
| Work from home | 13.0% |
| Other means | 3.6% |
| Avg commute (minutes) | 31.7 |
Poverty
All people
13.2%
Under 18 years
17.9%
18 and over
11.8%
Married-couple families
9.9%
Female-led households
14.8%
Income support
| Source | % of households |
|---|---|
| Social Security | 22.3% |
| Retirement income | 18.0% |
| Supplemental Security | 4.5% |
| Cash public assistance | 2.5% |
| Food stamps / SNAP | 17.7% |
Health indicators
| Condition | % |
|---|---|
| Obesity | 24.1% |
| High blood pressure | 27.6% |
| High cholesterol | 30.1% |
| Diabetes | 9.0% |
| Heart disease | 4.7% |
| Stroke | 2.5% |
| Asthma | 8.6% |
| Arthritis | 17.4% |
| Kidney disease | 2.5% |
| Pulmonary disease | 4.4% |
| Cancer | 4.9% |
| Behavior / access | % |
|---|---|
| Smoking | 11.7% |
| Binge drinking | 12.6% |
| No physical activity | 22.0% |
| Less than 7 hrs sleep | 32.3% |
| Depression | 15.7% |
| Fair or poor health | 12.7% |
| Poor mental health | 12.9% |
| Poor physical health | 7.6% |
| No health insurance | 19.2% |
| Visited doctor (checkup) | 71.0% |
| Visited dentist | 60.3% |
| Cholesterol screening | 90.4% |
| Teeth loss | 9.7% |
Veterans & disability
| Veterans | Count | % |
|---|---|---|
| Civilian veterans | 1,011 | 3.5% |
| Disability | % |
|---|---|
| Any disability | 12.4% |
| Under 18 | 4.5% |
| 18–64 years | 10.0% |
| 65 and over | 35.7% |
Health insurance coverage
| Type | % |
|---|---|
| Private insurance | 52.9% |
| Public insurance | 38.6% |
| No insurance | 19.4% |
| Uninsured under 19 | 12.1% |
Language & origin
Language spoken at home (age 5+)
| Language | Count | % |
|---|---|---|
| English only | 35,431 | 92.0% |
| Spanish | 12,714 | 35.9% |
| Other Indo-European | 8,632 | 24.4% |
| Asian & Pacific Islander | 1,253 | 3.5% |
| Other languages | 2,594 | 7.3% |
Place of birth & citizenship
| Origin | Count | % |
|---|---|---|
| Native born (US) | 20,743 | 53.8% |
| Born in same state | 20,033 | 52.0% |
| Born in different state | 10,330 | 26.8% |
| Foreign born | 710 | 1.8% |
| Naturalized citizen | 17,781 | 46.2% |
| Not a US citizen | 7,170 | 40.3% |
Ancestry
| Ancestry | Count | % |
|---|---|---|
| Italian | 1,444 | 3.7% |
| French | 1,366 | 3.5% |
| Arab | 976 | 2.5% |
| Polish | 205 | 0.5% |
| German | 189 | 0.5% |
| Ancestry | Count | % |
|---|---|---|
| English | 95 | 0.2% |
| Irish | 43 | 0.1% |
| Dutch | 20 | 0.1% |
| Norwegian | 10 | 0% |
Technology access
| Metric | % of households |
|---|---|
| Computer access | 32.7% |
| Internet access | 97.1% |
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 20877
What city is ZIP code 20877 in?
ZIP code 20877 is primarily assigned to Gaithersburg, Maryland.
What county is ZIP code 20877 in?
ZIP code 20877 falls within Montgomery County, Maryland.
Is Spanish widely spoken in ZIP code 20877?
Approximately 36% of households in ZIP code 20877 speak Spanish as a primary language.
Is ZIP code 20877 mostly rentals?
56% of occupied units in ZIP code 20877 are renter-occupied.
What is the typical home value in ZIP code 20877?
The median home value in ZIP code 20877 is $442,300.
What is the population of ZIP code 20877?
ZIP code 20877 has an estimated population of 38,524 residents, with a density of 6,829 people per square mile.
What timezone is ZIP code 20877 in?
ZIP code 20877 observes the EST timezone.