20899 ZIP Code — Gaithersburg, MD

Montgomery County, Maryland

ZIP code 20899 is located in Gaithersburg, Maryland, within Montgomery County. It covers approximately 0.11 square miles and serves a population of 143 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 301/240.

143

population

0.11

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

20899 ZIP code map

Cities in ZIP code 20899

Below are the cities the US Postal Service accepts for ZIP code 20899. Using any city not on this list may result in mail delivery delays.

City	Status
Gaithersburg	Acceptable
Gaithersburg	Preferred

Nearby ZIP codes

20877 Gaithersburg (1.2 mi) 20886 Montgomery Village (2.3 mi) 20879 Gaithersburg (2.5 mi) 20878 Gaithersburg (3.2 mi) 20855 Derwood (3.4 mi) 20850 Rockville (3.8 mi) 20874 Germantown (4.6 mi) 20857 Rockville (4.9 mi) 20876 Germantown (4.9 mi) 20853 Rockville (6.1 mi) 20851 Rockville (6.1 mi) 20882 Gaithersburg (6.7 mi)

Demographics updated 05/2026

Population
Total population	143
Population density	1,300 / sq mi
State FIPS	24
County FIPS	031

Geography
Land area	0.11 sq mi
Water area	0.00 sq mi
Latitude	39.1434
Longitude	-77.2018
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	68.3%	20.6%	28.2%
$50k – $100k	31.7%	24.2%	28.2%
$100k – $200k	0.0%	31.9%	30.1%
Over $200k	0.0%	23.3%	13.4%

Demographics & statistics

143

Population

1,300

People per sq mi

62.4

Median age

$19,722

Median household income

$20,655

Per capita income

Median home value

$1,025

Median monthly rent

0.0%

Home ownership

21.0%

Poverty rate

39.2%

Unemployment

Housing units

35.0%

Bachelor's or higher

Age distribution

Male Female

25–34

35–44

45–54

60–64

65–74

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	0	0.0%
18 and over	143	100.0%
65 and over	44	30.8%
Median age	62.4 years

Race & ethnicity

White 42%

Black or African American 40.1%

Hispanic or Latino 8.9%

Other race 8.9%

Group	Count	%
White	66	42%
Black or African American	63	40.1%
Hispanic or Latino	14	8.9%
Other race	14	8.9%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	68.3%	20.6%	28.2%
$50k – $100k	31.7%	24.2%	28.2%
$100k – $200k	0.0%	31.9%	30.1%
Over $200k	0.0%	23.3%	13.4%

$10k–$15k 24.2%

$15k–$25k 42.7%

$25k–$35k 14.5%

$35k–$50k 18.5%

Range	% of households
$10k–$15k	24.2%
$15k–$25k	42.7%
$25k–$35k	14.5%
$35k–$50k	18.5%
Median income	$19,722

Housing

Home values

Housing overview

Metric	Value
Median home value	$0
Median rent / month	$1,025
Owner occupied	0.0%
Renter occupied	100.0%
Vacant	0.0%
Single-family detached	0.0%
Large apartment buildings	100.0%
Mobile homes	0.0%
Median rooms	1.4
Avg household size (owned)	0.00

Year built

Era	%
2020 or later	0.0%
2010–2019	0.0%
2000–2009	0.0%
1990–1999	13.7%
1980–1989	59.7%
1970–1979	0.0%
1960–1969	26.6%
1950–1959	0.0%
1940–1949	0.0%
1939 or earlier	0.0%

Bedrooms

Size	% of units
No bedroom (studio)	100.0%
1 bedroom	0.0%
2 bedrooms	0.0%
3 bedrooms	0.0%
4 bedrooms	0.0%
5+ bedrooms	0.0%

Vehicles per household

Vehicles	% of households
No vehicle	46.0%
1 vehicle	54.0%
2 vehicles	0.0%
3 or more	0.0%

Heating fuel

Fuel type	%
Utility gas	30.6%
Electricity	55.6%
No fuel used	13.7%

Households & families

Household type	Count	%
Married-couple family	0	0.0%
Cohabiting couple	0	0.0%
Male householder, no spouse	37	29.8%
Female householder, no spouse	87	70.2%
Households with children under 18	0	0.0%
Households with seniors (65+)	44	35.5%
Average household size	1.15

Marital status

Status	Male	Female
Never married	0.0%	59.4%
Married	0.0%	0.0%
Separated	0.0%	17.0%
Widowed	0.0%	0.0%
Divorced	100.0%	23.6%

Education

Less than 9th grade 0.0%

Some HS, no diploma 12.6%

HS graduate 38.5%

Some college, no degree 14.0%

Associate's degree 0.0%

Bachelor's degree 9.8%

Graduate / professional 25.2%

Metric	%
HS diploma or higher	87.4%
Bachelor's or higher	35.0%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	0	0.0%
Kindergarten	0	0.0%
Elementary school	0	0.0%
High school	0	0.0%
College / grad school	19	100.0%

Employment

Industry of employment

Education & healthcare 54.8%

Arts, food & hospitality 45.2%

Occupation

Category	%
Management, business & arts	0.0%
Service	100.0%
Sales & office	0.0%
Natural resources & construction	0.0%
Production & transportation	0.0%

Employment type

Type	%
Private sector	100.0%
Government	0.0%
Self-employed	0.0%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	45.2%
Carpool	0.0%
Public transit	54.8%
Walk	0.0%
Work from home	0.0%
Other means	0.0%
Avg commute (minutes)	0.0

Poverty

All people 21.0%

Under 18 years 0.0%

18 and over 21.0%

Married-couple families 0.0%

Female-led households 0.0%

Income support

Source	% of households
Social Security	51.6%
Retirement income	36.3%
Supplemental Security	25.0%
Cash public assistance	26.6%
Food stamps / SNAP	67.7%

Health indicators

Condition	%
Obesity	28.0%
High blood pressure	33.0%
High cholesterol	31.8%
Diabetes	10.1%
Heart disease	4.7%
Stroke	2.8%
Asthma	9.4%
Arthritis	18.8%
Kidney disease	2.6%
Pulmonary disease	4.6%
Cancer	4.8%

Behavior / access	%
Smoking	12.4%
Binge drinking	12.3%
No physical activity	19.3%
Less than 7 hrs sleep	35.5%
Depression	15.3%
Fair or poor health	12.0%
Poor mental health	12.4%
Poor physical health	7.6%
No health insurance	12.6%
Visited doctor (checkup)	74.5%
Visited dentist	61.7%
Cholesterol screening	92.9%
Teeth loss	9.1%

Veterans & disability

Veterans	Count	%
Civilian veterans	14	9.8%

Disability	%
Any disability	44.8%
Under 18	0.0%
18–64 years	20.2%
65 and over	100.0%

Health insurance coverage

Type	%
Private insurance	28.0%
Public insurance	88.1%
No insurance	0.0%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	143	100.0%
Spanish	71	49.7%
Other Indo-European	34	23.8%
Asian & Pacific Islander	37	25.9%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	58	40.6%
Born in same state	58	40.6%
Born in different state	29	20.3%
Foreign born	0	0.0%
Naturalized citizen	85	59.4%
Not a US citizen	68	80.0%

Ancestry

Ancestry	Count	%
Arab	16	11.2%

Technology access

Metric	% of households
Computer access	86.7%
Internet access	100.0%

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

Frequently asked questions about ZIP code 20899

What city is ZIP code 20899 in?

ZIP code 20899 is primarily assigned to Gaithersburg, Maryland.

What county is ZIP code 20899 in?

ZIP code 20899 falls within Montgomery County, Maryland.

Is Spanish widely spoken in ZIP code 20899?

Approximately 50% of households in ZIP code 20899 speak Spanish as a primary language.

Does ZIP code 20899 have an older population?

31% of residents in ZIP code 20899 are 65 or older, above the national average of ~17%.

Does ZIP code 20899 have a large retiree population?

52% of households in ZIP code 20899 receive Social Security income, suggesting a significant retiree or disability population.

What is the poverty rate in ZIP code 20899?

21% of residents in ZIP code 20899 live below the poverty line, above the national average.

What timezone is ZIP code 20899 in?

ZIP code 20899 observes the EST timezone.