Residential delivery area · Maryland
ZIP Code 21711: Big Pool, MD
ZIP code 21711 uses the postal name Big Pool, Maryland and lies entirely in Washington County (Census 2020 ZIP-county file). About 930 people live there (Census Bureau, ACS 2020-2024). Median household income is $91,250 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Pecktonville (2%), Ernstville (under 1%), Indian Springs (under 1%) and Big Pool (under 1%); 96% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2021
- ZBP2023
- IRS2022
- Town
- Big Pool · its only residential ZIP
- County
- Washington County
- Census places
- Pecktonville (2%) census-designated place; Ernstville (under 1%) census-designated place; Indian Springs (under 1%) census-designated place; Big Pool (under 1%) census-designated place
- Metro area
- Hagerstown-Martinsburg, MD-WV
- House district
- MD-6 119th Congress
- State
- Maryland
- Time zone
- Eastern
- Land area
- 24.6 sq mi · 38 people per sq mi
Where is ZIP code 21711?
21711 centers on 39.668°, -78.020° and covers 24.6 square miles of land plus 0.7 of water. It borders 4 ZIP codes: 21722, 17236, 25427, 21750.
The map draws ZIP code areas only. For the streets inside 21711, 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 21711 compare with the rest of Washington County?
| Measure | 21711 | In Washington County | In MD |
|---|---|---|---|
| People (ACS 2020-2024) | 929 | 18th of 20 | 354th of 477 |
| Median household income | $91k | not ranked | not ranked |
| Median home value | $311k | not ranked | not ranked |
21711's income and home value are not ranked: it has fewer than 1,000 residents (929). Rankings use ZIP codes of 1,000 or more people living in households, with margins at most 25% of the figure.
It is denser than 37% of 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 21711?
The 2020 Census counted 1,108 people in 21711; the ACS, which samples households over 2020-2024, estimates 929. Between the 2010 and 2020 censuses its population grew 7.7% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 929±295 (90% margin)
- 2020 Census count
- 1,108+7.7% since 2010 (1,029)
- Households
- 434
- Median age
- 52.3
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 21711?
Of the 929 people the ACS estimates in 21711, 16.8% are under 18 and 21.9% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (100.0%).
- Under 1816.8%
- 18 to 6461.4%
- 65 and older21.9%
- White, not Hispanic100.0%
- Hispanic or Latino0.0%
- Black, not Hispanic0.0%
- Asian, not Hispanic0.0%
- Other or two or more0.0%
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 21711 earn?
Median household income is $91,250 (ACS 2020-2024). It is not measurably different from 2015-2019 ($92,462 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $91,250±$12,603
- Income per person
- $45,819
- Below the poverty line
- 11.2%
- Unemployed (of the labor force)
- 5.5%
- Adults 25+ with a bachelor's degree
- 20.2%
- Adjusted gross income per tax return, 2022
- $67,690500 returns; wages 76% 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 21711?
- Median home value (owners' estimate)
- $310,600
- Median gross rent
- –
- Homes owned by their occupants
- 100.0%
- Housing units
- 448
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 21711?
16 business establishments had a location in this ZIP code in 2023, 2 more than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction7
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 21711?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 21722 | Clear Spring | 6,721 | $88k | 5.7 mi |
| 17236 | Mercersburg, PA | 8,845 | $79k | 9.9 mi |
| 25427 | Hedgesville, WV | 16,595 | $87k | 11.1 mi |
| 21750 | Hancock | 3,417 | $61k | 11.5 mi |
| 25419 | Falling Waters, WV | 13,201 | $89k | 9.3 mi (near) |
| 17212 | Big Cove Tannery, PA | 750 | $84k | 10.2 mi (near) |
| 21795 | Williamsport | 10,144 | $88k | 12.1 mi (near) |
| 25403 | Martinsburg, WV | 16,470 | $88k | 13.4 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.