20855 ZIP Code — Derwood, MD

Montgomery County, Maryland

ZIP code 20855 is located in Derwood, Maryland, within Montgomery County. It covers approximately 13.07 square miles and serves a population of 16,558 residents. This is a po box ZIP code in the Eastern (ET) timezone, served by area code 240/301.

About ZIP code 20855

The housing stock consists of a mix of housing types. Most homes were built in the 1980s, giving the area an established character. Median home value is $598,900. Owner-occupancy is high at 80%, well above the national average.

The gap between median ($146,036) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 5% is below the national average.

The dominant occupation class is management, business, and professional, with professional and management as the leading industry. The average commute of 34 minutes is near the national average. Remote work is prevalent — 25% of workers work from home.

Educational attainment is high — 67% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 20855 reflects a community defined by a highly educated population, high homeownership, and a high rate of remote workers.

16,558

population

13.07

sq mi land

PO Box

ZIP type

Eastern (ET)

timezone

20855 ZIP code map

Cities in ZIP code 20855

Below are the cities the US Postal Service accepts for ZIP code 20855. Using any city not on this list may result in mail delivery delays.

City	Status
Derwood	Acceptable
Derwood	Preferred

Nearby ZIP codes

20877 Gaithersburg (2.3 mi) 20853 Rockville (3.1 mi) 20899 Gaithersburg (3.4 mi) 20879 Gaithersburg (3.4 mi) 20886 Montgomery Village (3.5 mi) 20832 Olney (3.6 mi) 20857 Rockville (4 mi) 20851 Rockville (4.4 mi) 20850 Rockville (4.6 mi) 20897 Suburb Maryland Fac (5.7 mi) 20906 Silver Spring (5.7 mi) 20860 Sandy Spring (5.8 mi)

Demographics updated 05/2026

Population
Total population	16,558
Population density	1,267 / sq mi
State FIPS	24
County FIPS	031

Geography
Land area	13.07 sq mi
Water area	0.22 sq mi
Latitude	39.1411
Longitude	-77.1380
Timezone	Eastern (ET)
Area code	240/301

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	15.4%	20.6%	28.2%
$50k – $100k	18.6%	24.2%	28.2%
$100k – $200k	39.4%	31.9%	30.1%
Over $200k	26.6%	23.3%	13.4%

Demographics & statistics

16,558

Population

1,267

People per sq mi

41.9

Median age

$146,036

Median household income

$64,605

Per capita income

$598,900

Median home value

$2,307

Median monthly rent

80.3%

Home ownership

5.2%

Poverty rate

3.4%

Unemployment

4,930

Housing units

66.5%

Bachelor's or higher

Age distribution

Male Female

495

Under 5

531

429

5–9

459

489

10–14

523

468

15–19

502

405

20–24

433

964

25–34

1,032

1,048

35–44

1,123

949

45–54

1,016

540

55–59

578

741

60–64

793

808

65–74

865

523

75–84

560

137

85+

147

← Male

Female →

Age summary

Group	Count	%
Under 18	3,474	21.0%
18 and over	13,084	79.0%
65 and over	3,040	18.4%
Median age	41.9 years

Race & ethnicity

White 51.3%

Asian 15.5%

Black or African American 11.9%

Two or more races 8.5%

Hispanic or Latino 7.5%

Other race 3.9%

American Indian / Alaska Native 1.4%

Group	Count	%
White	9,178	51.3%
Asian	2,778	15.5%
Black or African American	2,138	11.9%
Two or more races	1,521	8.5%
Hispanic or Latino	1,348	7.5%
Other race	690	3.9%
American Indian / Alaska Native	253	1.4%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	15.4%	20.6%	28.2%
$50k – $100k	18.6%	24.2%	28.2%
$100k – $200k	39.4%	31.9%	30.1%
Over $200k	26.6%	23.3%	13.4%

Under $10k 0.9%

$10k–$15k 1.2%

$15k–$25k 5.1%

$25k–$35k 3.3%

$35k–$50k 4.3%

$50k–$75k 6.1%

$75k–$100k 10.2%

$100k–$150k 20.3%

$150k–$200k 17.2%

$200k+ 31.4%

Range	% of households
Under $10k	0.9%
$10k–$15k	1.2%
$15k–$25k	5.1%
$25k–$35k	3.3%
$35k–$50k	4.3%
$50k–$75k	6.1%
$75k–$100k	10.2%
$100k–$150k	20.3%
$150k–$200k	17.2%
$200k+	31.4%
Median income	$146,036

Housing

Home values

Under $50k 0.1%

$50k–$100k 0.2%

$100k–$150k 0.9%

$150k–$200k 0.9%

$200k–$300k 4.2%

$300k–$500k 24.4%

$500k–$1M 62.9%

$1M+ 6.3%

Housing overview

Metric	Value
Median home value	$598,900
Median rent / month	$2,307
Owner occupied	80.3%
Renter occupied	19.7%
Vacant	1.8%
Single-family detached	68.1%
Large apartment buildings	11.2%
Mobile homes	0.0%
Median rooms	7.9
Avg household size (owned)	2.83

Year built

Era	%
2020 or later	0.5%
2010–2019	18.8%
2000–2009	2.0%
1990–1999	5.4%
1980–1989	31.7%
1970–1979	17.3%
1960–1969	21.5%
1950–1959	0.9%
1940–1949	0.6%
1939 or earlier	1.3%

Bedrooms

Size	% of units
No bedroom (studio)	1.0%
1 bedroom	5.4%
2 bedrooms	11.8%
3 bedrooms	23.7%
4 bedrooms	38.3%
5+ bedrooms	19.8%

Vehicles per household

Vehicles	% of households
No vehicle	6.3%
1 vehicle	22.9%
2 vehicles	47.1%
3 or more	23.7%

Heating fuel

Fuel type	%
Utility gas	43.7%
Electricity	44.8%
Propane / LP gas	3.4%
Fuel oil	6.3%
Wood	0.1%
Solar	0.4%
No fuel used	0.2%

Households & families

Household type	Count	%
Married-couple family	3,632	60.5%
Cohabiting couple	195	3.2%
Male householder, no spouse	807	13.4%
Female householder, no spouse	1,369	22.8%
Households with children under 18	1,996	33.3%
Households with seniors (65+)	2,067	34.4%
Average household size	2.74

Marital status

Status	Male	Female
Never married	32.2%	26.4%
Married	60.5%	54.7%
Separated	1.3%	0.9%
Widowed	2.5%	9.2%
Divorced	3.4%	8.8%

Education

Less than 9th grade 3.2%

Some HS, no diploma 1.6%

HS graduate 9.8%

Some college, no degree 14.1%

Associate's degree 4.8%

Bachelor's degree 32.8%

Graduate / professional 33.7%

Metric	%
HS diploma or higher	95.2%
Bachelor's or higher	66.5%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	138	3.8%
Kindergarten	115	3.2%
Elementary school	1,521	42.1%
High school	876	24.3%
College / grad school	960	26.6%

Employment

Industry of employment

Professional & management 24.6%

Education & healthcare 20.1%

Public administration 11.8%

Other services 7.3%

Finance & real estate 6.8%

Arts, food & hospitality 5.5%

Construction 5.1%

Retail trade 4.8%

Transportation & utilities 4.6%

Manufacturing 4.2%

Information 2.9%

Wholesale trade 2.2%

Agriculture & mining 0.1%

Occupation

Category	%
Management, business & arts	66.1%
Service	12.0%
Sales & office	14.6%
Natural resources & construction	2.4%
Production & transportation	4.9%

Employment type

Type	%
Private sector	69.7%
Government	22.3%
Self-employed	7.9%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	58.4%
Carpool	6.7%
Public transit	8.4%
Walk	0.4%
Work from home	25.1%
Other means	1.1%
Avg commute (minutes)	34.3

Poverty

All people 5.2%

Under 18 years 6.2%

18 and over 5.0%

Married-couple families 2.4%

Female-led households 11.3%

Income support

Source	% of households
Social Security	28.2%
Retirement income	26.5%
Supplemental Security	2.8%
Cash public assistance	2.9%
Food stamps / SNAP	3.9%

Health indicators

Condition	%
Obesity	20.0%
High blood pressure	28.6%
High cholesterol	35.4%
Diabetes	8.4%
Heart disease	5.0%
Stroke	2.3%
Asthma	7.9%
Arthritis	19.6%
Kidney disease	2.4%
Pulmonary disease	4.4%
Cancer	6.3%

Behavior / access	%
Smoking	8.9%
Binge drinking	12.3%
No physical activity	16.1%
Less than 7 hrs sleep	28.6%
Depression	15.5%
Fair or poor health	8.9%
Poor mental health	10.8%
Poor physical health	6.5%
No health insurance	9.6%
Visited doctor (checkup)	73.4%
Visited dentist	71.4%
Cholesterol screening	93.8%
Teeth loss	6.3%

Veterans & disability

Veterans	Count	%
Civilian veterans	745	5.7%

Disability	%
Any disability	9.6%
Under 18	1.9%
18–64 years	5.3%
65 and over	33.1%

Health insurance coverage

Type	%
Private insurance	86.1%
Public insurance	25.3%
No insurance	3.4%
Uninsured under 19	1.2%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	15,532	93.8%
Spanish	2,288	14.7%
Other Indo-European	647	4.2%
Asian & Pacific Islander	428	2.8%
Other languages	833	5.4%

Place of birth & citizenship

Origin	Count	%
Native born (US)	11,537	69.7%
Born in same state	11,107	67.1%
Born in different state	4,832	29.2%
Foreign born	430	2.6%
Naturalized citizen	5,021	30.3%
Not a US citizen	3,645	72.6%

Ancestry

Ancestry	Count	%
French	1,488	9%
Italian	1,401	8.5%
Arab	446	2.7%
English	187	1.1%
Irish	81	0.5%

Ancestry	Count	%
Polish	79	0.5%
German	48	0.3%
Dutch	42	0.3%
Norwegian	15	0.1%

Technology access

Metric	% of households
Computer access	36.3%
Internet access	97.1%

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

Frequently asked questions about ZIP code 20855

What city is ZIP code 20855 in?

ZIP code 20855 is primarily assigned to Derwood, Maryland.

What county is ZIP code 20855 in?

ZIP code 20855 falls within Montgomery County, Maryland.

How educated is the population of ZIP code 20855?

67% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Is ZIP code 20855 mostly owner-occupied?

80% of occupied units in ZIP code 20855 are owner-occupied, well above the national average.

What is the median household income in ZIP code 20855?

The median household income in ZIP code 20855 is $146,036, above the national median of ~$75,000.

What is the typical home value in ZIP code 20855?

The median home value in ZIP code 20855 is $598,900.

What timezone is ZIP code 20855 in?

ZIP code 20855 observes the EST timezone.