Gaithersburg ZIP Code List — Montgomery County, MD

There are 9 unique ZIP codes in Gaithersburg, Maryland. Area code: 301/240.

ZIP codes

72.57

sq mi land

0.63

sq mi water

301/240

area code

Gaithersburg, MD ZIP code map

About Gaithersburg, MD

Gaithersburg, MD, is a vibrant city located in Montgomery County. Known for its diverse community and rich history, it offers a blend of suburban living with urban amenities. The city is an attraction for families, professionals, and visitors alike, featuring a mix of residential neighborhoods, commercial areas, and recreational spots.

Location & geography

Situated in the northern part of Montgomery County, Gaithersburg is bordered by several other municipalities, including Rockville to the southwest and Germantown to the northwest. The city spans a total land area of 72.57 square miles, complemented by a water area of 0.63 square miles. The terrain is primarily flat, allowing for well-planned residential and commercial developments.

Community & economy

Gaithersburg boasts a multicultural community, contributing to its dynamic character and engaging local culture. The city's economy is diverse, with key industries including technology, retail, and biotechnology, making it an attractive place for employment. Daily life in Gaithersburg is enhanced by a variety of parks, cultural events, and community gatherings, promoting a sense of belonging among residents.

Transportation

Major thoroughfares such as Interstate 270 and Maryland Route 355 provide convenient access to and from Gaithersburg. The nearest airport for commercial air travel is Baltimore/Washington International Thurgood Marshall Airport, located approximately 30 miles away. Public transportation options include bus services and the nearby Maryland Area Regional Commuter (MARC) train line.

History

Gaithersburg was founded in the 19th century, developing around the Baltimore and Ohio Railroad. It has grown from its roots as an agricultural community to a bustling suburban city, with key industries evolving over the years in technology and retail. Notable events in its history include the incorporation of Gaithersburg in 1878, which marked its official establishment as a city.

Did you know?

One surprising fact about Gaithersburg is that it is home to one of the largest and oldest planned communities, called Kentlands, which was developed in the 1990s. Additionally, the city hosts an annual Science and Technology Festival, celebrating its commitment to innovation and education.

ZIP codes for Gaithersburg, MD (9)

ZIP code	City	County	Map
20877	Gaithersburg	Montgomery	View map
20878	Gaithersburg	Montgomery	View map
20879	Gaithersburg	Montgomery	View map
20882	Gaithersburg	Montgomery	View map
20883	Gaithersburg	Montgomery	View map
20884	Gaithersburg	Montgomery	View map
20885	Gaithersburg	Montgomery	View map
20898	Gaithersburg	Montgomery	View map
20899	Gaithersburg	Montgomery	View map

Demographics & statistics

145,929

Population

39.2

Median age

$122,218

Median household income

$55,615

Per capita income

$542,575

Median home value

$1,435

Median monthly rent

70.7%

Home ownership

7.9%

Poverty rate

5.5%

Unemployment

35,435

Housing units

51.4%

Bachelor's or higher

Age distribution

Male Female

4,298

Under 5

4,522

4,388

5–9

4,617

4,658

10–14

4,902

4,617

15–19

4,858

4,683

20–24

4,928

8,556

25–34

9,003

10,182

35–44

10,716

9,651

45–54

10,157

5,122

55–59

5,390

4,650

60–64

4,894

6,336

65–74

6,667

2,859

75–84

3,009

1,104

85+

1,162

← Male

Female →

Age summary

Group	Count	%
Under 18	33,301	22.5%
18 and over	112,628	77.5%
65 and over	21,137	15.0%
Median age	39.2 years

Race & ethnicity

White 37.1%

Asian 16.6%

Hispanic or Latino 15.5%

Black or African American 11.8%

Other race 11.1%

Two or more races 7.3%

American Indian / Alaska Native 0.3%

Native Hawaiian / Pacific Islander 0.1%

Group	Count	%
White	64,162	37.1%
Asian	28,731	16.6%
Hispanic or Latino	26,824	15.5%
Black or African American	20,459	11.8%
Other race	19,173	11.1%
Two or more races	12,657	7.3%
American Indian / Alaska Native	584	0.3%
Native Hawaiian / Pacific Islander	163	0.1%

Household income

Under $10k 3.1%

$10k–$15k 1.5%

$15k–$25k 3.7%

$25k–$35k 4.2%

$35k–$50k 6.1%

$50k–$75k 10.9%

$75k–$100k 11.2%

$100k–$150k 20.1%

$150k–$200k 14.4%

$200k+ 25.0%

Range	% of households
Under $10k	3.1%
$10k–$15k	1.5%
$15k–$25k	3.7%
$25k–$35k	4.2%
$35k–$50k	6.1%
$50k–$75k	10.9%
$75k–$100k	11.2%
$100k–$150k	20.1%
$150k–$200k	14.4%
$200k+	25.0%
Median income	$122,218

Housing

Home values

Under $50k 1.8%

$50k–$100k 0.6%

$100k–$150k 1.7%

$150k–$200k 2.5%

$200k–$300k 6.2%

$300k–$500k 35.6%

$500k–$1M 45.2%

$1M+ 6.5%

Housing overview

Metric	Value
Median home value	$542,575
Median rent / month	$1,435
Owner occupied	70.7%
Renter occupied	29.3%
Vacant	3.5%
Single-family detached	50.6%
Large apartment buildings	10.6%
Mobile homes	0.4%
Median rooms	7.0
Avg household size (owned)	3.08

Year built

Era	%
2020 or later	0.5%
2010–2019	6.9%
2000–2009	12.5%
1990–1999	14.0%
1980–1989	32.9%
1970–1979	20.6%
1960–1969	7.4%
1950–1959	2.6%
1940–1949	1.1%
1939 or earlier	1.5%

Bedrooms

Size	% of units
No bedroom (studio)	2.6%
1 bedroom	10.1%
2 bedrooms	15.9%
3 bedrooms	29.3%
4 bedrooms	28.4%
5+ bedrooms	13.8%

Vehicles per household

Vehicles	% of households
No vehicle	5.6%
1 vehicle	28.2%
2 vehicles	39.8%
3 or more	26.4%

Heating fuel

Fuel type	%
Utility gas	37.9%
Electricity	51.6%
Propane / LP gas	3.0%
Fuel oil	5.9%
Wood	0.2%
Solar	0.4%
No fuel used	0.6%

Households & families

Household type	Count	%
Married-couple family	29,767	60.9%
Cohabiting couple	2,204	4.2%
Male householder, no spouse	5,869	11.1%
Female householder, no spouse	12,573	23.8%
Households with children under 18	18,098	35.5%
Households with seniors (65+)	14,211	30.0%
Average household size	2.96

Marital status

Status	Male	Female
Never married	33.7%	29.5%
Married	59.3%	53.0%
Separated	0.6%	1.3%
Widowed	1.4%	6.6%
Divorced	5.0%	9.6%

Education

Less than 9th grade 6.6%

Some HS, no diploma 3.8%

HS graduate 16.5%

Some college, no degree 14.8%

Associate's degree 6.9%

Bachelor's degree 27.2%

Graduate / professional 24.2%

Metric	%
HS diploma or higher	89.7%
Bachelor's or higher	51.4%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	2,200	5.6%
Kindergarten	1,470	4.4%
Elementary school	15,116	40.1%
High school	8,217	22.3%
College / grad school	9,772	27.6%

Employment

Industry of employment

Professional & management 22.1%

Education & healthcare 20.1%

Public administration 10.1%

Arts, food & hospitality 8.9%

Retail trade 8.0%

Construction 7.9%

Other services 6.5%

Finance & real estate 5.3%

Manufacturing 4.4%

Transportation & utilities 2.7%

Information 1.8%

Wholesale trade 1.7%

Agriculture & mining 0.7%

Occupation

Category	%
Management, business & arts	51.8%
Service	15.8%
Sales & office	17.6%
Natural resources & construction	8.0%
Production & transportation	6.9%

Employment type

Type	%
Private sector	73.9%
Government	19.8%
Self-employed	5.7%
Unpaid family workers	0.5%

Commute

Method	%
Drive alone	62.4%
Carpool	10.1%
Public transit	6.3%
Walk	1.0%
Other means	1.9%
Avg commute (minutes)	33.3

Poverty

All people 7.9%

Under 18 years 9.7%

18 and over 7.4%

Married-couple families 4.7%

Female-led households 8.1%

Income support

Source	% of households
Social Security	24.0%
Retirement income	21.4%
Supplemental Security	4.1%
Cash public assistance	2.0%
Food stamps / SNAP	9.1%

Health indicators

Condition	%
High blood pressure	26.3%
High cholesterol	32.0%
Heart disease	4.2%
Stroke	2.1%
Asthma	8.2%
Arthritis	17.1%
Kidney disease	2.2%
Pulmonary disease	3.9%
Cancer	5.1%

Behavior / access	%
Binge drinking	13.3%
No physical activity	17.3%
Less than 7 hrs sleep	30.5%
Fair or poor health	9.5%
Poor mental health	11.8%
Poor physical health	6.5%
No health insurance	12.7%
Visited doctor (checkup)	71.6%
Visited dentist	68.1%
Cholesterol screening	92.5%
Teeth loss	6.9%

Veterans & disability

Veterans	Count	%
Civilian veterans	4,553	4.7%

Disability	%
Any disability	9.8%
Under 18	3.9%
18–64 years	7.8%
65 and over	28.0%

Health insurance coverage

Type	%
Private insurance	73.6%
Public insurance	28.8%
Uninsured under 19	4.9%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	137,109	94.1%
Spanish	27,354	18.7%
Other Indo-European	14,727	10.8%
Asian & Pacific Islander	4,934	3.3%
Other languages	7,069	4.1%

Place of birth & citizenship

Origin	Count	%
Native born (US)	93,232	67.8%
Born in same state	90,729	66.1%
Born in different state	42,220	31.7%
Foreign born	2,503	1.7%
Naturalized citizen	52,697	32.3%
Not a US citizen	27,560	56.8%

Ancestry

Ancestry	Count	%
Italian	9,219	6.3%
French	9,117	6.2%
Arab	4,288	2.9%
Polish	890	0.6%
English	880	0.6%

Ancestry	Count	%
German	483	0.3%
Irish	446	0.3%
Norwegian	295	0.2%
Dutch	283	0.2%

Technology access

Metric	% of households
Computer access	33.8%
Internet access	97.5%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions

What ZIP codes does Gaithersburg, MD have?

Gaithersburg, MD has 5 ZIP codes: 20877, 20878, 20879, 20882, 20899. Each ZIP code serves a distinct delivery area within the city and surrounding region.

What is the main ZIP code for Gaithersburg, MD?

The primary ZIP code for Gaithersburg, MD is 20877. The city uses area code 301 or 240 for phone service.

What county is Gaithersburg, MD in?

Gaithersburg is located in Montgomery County, Maryland.

How many ZIP codes are in Gaithersburg, MD?

Gaithersburg, MD has 5 ZIP codes.

What ZIP code covers the downtown Gaithersburg area and City Center?

Downtown Gaithersburg and the Gaithersburg City Center are primarily located in ZIP code 20877, which serves as the main commercial and civic hub of the city.

Which ZIP codes serve the Kentlands neighborhood in Gaithersburg?

The Kentlands master-planned community in Gaithersburg is primarily served by ZIP codes 20878 and 20879, which cover this popular residential development on the city's west side.