Residential delivery area · Maryland
ZIP Code 20871: Clarksburg, MD
ZIP code 20871 uses the postal name Clarksburg, Maryland and lies mostly in Montgomery County (94% of its land) with the rest in Frederick County (Census 2020 ZIP-county file). About 30,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $177,523 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Clarksburg (26%) and Green Valley (6%), and 3% in smaller places; 65% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Clarksburg · its only residential ZIP
- County
- Montgomery County (94%); Frederick County (6%)
- Census places
- Clarksburg (26%) census-designated place; Green Valley (6%) census-designated place
- Metro area
- Washington-Arlington-Alexandria, DC-VA-MD-WV
- House district
- MD-6 119th Congress
- State
- Maryland
- Time zone
- Eastern
- Land area
- 22.9 sq mi · 1,319 people per sq mi
Where is ZIP code 20871?
20871 centers on 39.259°, -77.282° and covers 22.9 square miles of land plus 0.0 of water. It borders 5 ZIP codes: 20876, 20872, 21754, 20841, 20842.
The map draws ZIP code areas only. For the streets inside 20871, 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 20871 compare with the rest of Montgomery County?
| Measure | 20871 | In Montgomery County | In MD |
|---|---|---|---|
| People (ACS 2020-2024) | 30,182 | 19th of 53 | 83rd of 477 |
| Median household income | $178k | 12th of 41 | 24th of 293 |
| Median home value | $669k | 20th of 41 | 33rd of 320 |
Its median household income is higher than in 98% 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 20871?
The 2020 Census counted 28,557 people in 20871; the ACS, which samples households over 2020-2024, estimates 30,182. Its boundary changed between the 2010 and 2020 censuses, so the two counts are not compared.
- People, ACS 2020-2024
- 30,182
- 2020 Census count
- 28,557
- Households
- 9,347
- Median age
- 37.7
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 20871?
Of the 30,182 people the ACS estimates in 20871, 29.3% are under 18 and 9.0% are 65 or older. The largest group by race and Hispanic origin is Asian (not Hispanic) (38.8%), then White (not Hispanic) (26.2%).
- Under 1829.3%
- 18 to 6461.6%
- 65 and older9.0%
- Asian, not Hispanic38.8%
- White, not Hispanic26.2%
- Hispanic or Latino15.6%
- Black, not Hispanic13.2%
- Other or two or more6.2%
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 20871 earn?
Median household income is $177,523 (ACS 2020-2024), the 12th highest of the 41 ranked ZIP codes in Montgomery County.
- Median household income
- $177,523
- Income per person
- $59,923
- Below the poverty line
- 3.8%
- Unemployed (of the labor force)
- 4.3%
- Adults 25+ with a bachelor's degree
- 68.1%
- Adjusted gross income per tax return, 2022
- $124,18313,770 returns; wages 86% 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 20871?
FHFA's house price index for 20871, built from repeat sales and appraisals of the same homes, rose 44% from 2015 to 2025 and rose 32% from 2020 to 2025, and moved −4.6% in 2025.
- Median home value (owners' estimate)
- $668,800
- Median gross rent
- $2,560
- Homes owned by their occupants
- 90.6%
- Housing units
- 9,405
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 20871?
544 business establishments had a location in this ZIP code in 2023, 151 more than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services207
- Retail trade80
- Construction50
- Health care and social assistance42
- Administrative and support and waste management and remediation services32
- Real estate and rental and leasing30
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 20871?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 20876 | Germantown | 26,406 | $120k | 4.4 mi |
| 20872 | Damascus | 13,983 | $141k | 4.9 mi |
| 21754 | Ijamsville | 8,156 | $182k | 5.4 mi |
| 20841 | Boyds | 9,969 | $185k | 5.7 mi |
| 20842 | Dickerson | 2,369 | $204k | 8.2 mi |
| 20838 | Barnesville | 306 | $250k+ | 5.3 mi (near) |
| 20886 | Montgomery Village | 34,718 | $99k | 6.4 mi (near) |
| 21770 | Monrovia | 8,751 | $184k | 6.5 mi (near) |
| 20882 | Gaithersburg | 13,751 | $184k | 6.7 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.