Residential delivery area · Maryland
ZIP Code 20855: Derwood, MD
ZIP code 20855 uses the postal name Derwood, Maryland and lies entirely in Montgomery County (Census 2020 ZIP-county file). About 17,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $149,110 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Redland (49%) and Derwood (5%); 46% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Derwood · its only residential ZIP
- County
- Montgomery County
- Census places
- Redland (49%) census-designated place; Derwood (5%) census-designated place
- Metro area
- Washington-Arlington-Alexandria, DC-VA-MD-WV
- House district
- MD-8 119th Congress
- State
- Maryland
- Time zone
- Eastern
- Land area
- 13.1 sq mi · 1,322 people per sq mi
Where is ZIP code 20855?
20855 centers on 39.137°, -77.132° and covers 13.1 square miles of land plus 0.2 of water. It borders 8 ZIP codes: 20880, 20879, 20832, 20853, 20877, 20850, 20833, 20882.
The map draws ZIP code areas only. For the streets inside 20855, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 20855 compare with the rest of Montgomery County?
| Measure | 20855 | In Montgomery County | In MD |
|---|---|---|---|
| People (ACS 2020-2024) | 17,279 | 29th of 53 | 140th of 477 |
| Median household income | $149k | 21st of 41 | 57th of 293 |
| Median home value | $640k | 23rd of 41 | 38th of 320 |
Its median household income is higher than in 96% of U.S. residential ZIP codes, and it is denser than 81% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 20855?
The 2020 Census counted 17,003 people in 20855; the ACS, which samples households over 2020-2024, estimates 17,279. Between the 2010 and 2020 censuses its population grew 18.9% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 17,279
- 2020 Census count
- 17,003+18.9% since 2010 (14,295)
- Households
- 6,437
- Median age
- 41.3
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 20855?
Of the 17,279 people the ACS estimates in 20855, 20.7% are under 18 and 19.6% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (44.2%), then Asian (not Hispanic) (20.7%).
- Under 1820.7%
- 18 to 6459.7%
- 65 and older19.6%
- White, not Hispanic44.2%
- Asian, not Hispanic20.7%
- Black, not Hispanic15.6%
- Hispanic or Latino11.7%
- Other or two or more7.7%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 20855 earn?
Median household income is $149,110 (ACS 2020-2024), the 21st highest of the 41 ranked ZIP codes in Montgomery County. It fell from $170,487 in 2015-2019 (in 2024 dollars), a change larger than the surveys' margins of error.
- Median household income
- $149,110
- Income per person
- $69,847
- Below the poverty line
- 5.2%
- Unemployed (of the labor force)
- 4.0%
- Adults 25+ with a bachelor's degree
- 66.8%
- Adjusted gross income per tax return, 2022
- $129,0078,780 returns; wages 69% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 20855?
FHFA's house price index for 20855, built from repeat sales and appraisals of the same homes, rose 55% from 2015 to 2025 and rose 40% from 2020 to 2025, and moved +6.3% in 2025.
- Median home value (owners' estimate)
- $640,300
- Median gross rent
- $2,413
- Homes owned by their occupants
- 74.4%
- Housing units
- 6,525
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 20855?
480 business establishments had a location in this ZIP code in 2023, 12 fewer than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services95
- Construction56
- Other services (except public administration)53
- Administrative and support and waste management and remediation services46
- Health care and social assistance42
- Finance and insurance33
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 20855?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 20880 | Washington Grove | 577 | $135k | 2.3 mi |
| 20879 | Gaithersburg | 25,264 | $112k | 2.7 mi |
| 20832 | Olney | 25,553 | $169k | 3.0 mi |
| 20853 | Rockville | 31,851 | $159k | 3.1 mi |
| 20877 | Gaithersburg | 38,546 | $93k | 3.2 mi |
| 20850 | Rockville | 50,353 | $126k | 4.2 mi |
| 20833 | Brookeville | 7,860 | $204k | 6.3 mi |
| 20882 | Gaithersburg | 13,751 | $184k | 6.5 mi |
| 20851 | Rockville | 14,946 | $126k | 4.1 mi (near) |
| 20899 | Gaithersburg | 57 | $24k | 4.6 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.