Residential delivery area · Maryland
ZIP Code 21837: Mardela Springs, MD
ZIP code 21837 uses the postal name Mardela Springs, Maryland and lies entirely in Wicomico County (Census 2020 ZIP-county file). About 2,900 people live there (Census Bureau, ACS 2020-2024). Median household income is $62,880 (Census Bureau, ACS 2020-2024). By Census place, under 1% of its land lies in Mardela Springs; more than 99% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Mardela Springs · its only residential ZIP
- County
- Wicomico County
- Census places
- Mardela Springs
- Metro area
- Salisbury, MD
- House district
- MD-1 119th Congress
- State
- Maryland
- Time zone
- Eastern
- Land area
- 43.9 sq mi · 66 people per sq mi
Where is ZIP code 21837?
21837 centers on 38.455°, -75.766° and covers 43.9 square miles of land plus 3.3 of water. It borders 6 ZIP codes: 21830, 21861, 21869, 19940, 21875, 19956.
The map draws ZIP code areas only. For the streets inside 21837, 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 21837 compare with the rest of Wicomico County?
| Measure | 21837 | In Wicomico County | In MD |
|---|---|---|---|
| People (ACS 2020-2024) | 2,891 | 9th of 16 | 279th of 477 |
| Median household income | $63k | not ranked | not ranked |
| Median home value | $227k | 8th of 9 | 295th of 320 |
21837's median household income is not ranked: its 90% margin of error (±$21,760) is more than a quarter of the figure ($62,880). 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 47% 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 21837?
The 2020 Census counted 2,647 people in 21837; the ACS, which samples households over 2020-2024, estimates 2,891. Between the 2010 and 2020 censuses its population grew 1.3% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 2,891±479 (90% margin)
- 2020 Census count
- 2,647+1.3% since 2010 (2,614)
- Households
- 1,123
- Median age
- 40.8
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 21837?
Of the 2,891 people the ACS estimates in 21837, 22.7% are under 18 and 18.8% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (66.8%), then Black (not Hispanic) (21.5%).
- Under 1822.7%
- 18 to 6458.5%
- 65 and older18.8%
- White, not Hispanic66.8%
- Black, not Hispanic21.5%
- Hispanic or Latino5.9%
- Other or two or more4.5%
- Asian, not Hispanic1.2%
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 21837 earn?
Median household income is $62,880 (ACS 2020-2024). It fell from $91,324 in 2015-2019 (in 2024 dollars), a change larger than the surveys' margins of error.
- Median household income
- $62,880±$21,760
- Income per person
- $34,456
- Below the poverty line
- 5.7%
- Unemployed (of the labor force)
- 4.6%
- Adults 25+ with a bachelor's degree
- 18.0%
- Adjusted gross income per tax return, 2022
- $62,6201,220 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 21837?
FHFA's house price index for 21837, built from repeat sales and appraisals of the same homes, rose 103% from 2015 to 2025 and rose 79% from 2020 to 2025, and moved +23.2% in 2025.
- Median home value (owners' estimate)
- $227,400
- Median gross rent
- $1,115
- Homes owned by their occupants
- 87.2%
- Housing units
- 1,179
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 21837?
33 business establishments had a location in this ZIP code in 2023, 1 fewer than in 2018; the most are in retail trade (ZIP Code Business Patterns).
- Retail trade7
- Transportation and warehousing4
- Other services (except public administration)4
- Construction3
- Professional, scientific, and technical services3
- Administrative and support and waste management and remediation services3
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 21837?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 21830 | Hebron | 5,200 | $113k | 4.3 mi |
| 21861 | Sharptown | 920 | $86k | 6.0 mi |
| 21869 | Vienna | 827 | $62k | 9.4 mi |
| 19940 | Delmar, DE | 7,540 | $65k | 11.0 mi |
| 21875 | Delmar | 7,646 | $84k | 12.0 mi |
| 19956 | Laurel, DE | 16,327 | $66k | 13.9 mi |
| 21659 | Rhodesdale | 1,601 | $74k | 8.5 mi (near) |
| 21801 | Salisbury | 30,088 | $71k | 8.7 mi (near) |
| 21856 | Quantico | 1,037 | $88k | 8.7 mi (near) |
| 21835 | Linkwood | 312 | $47k | 10.7 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.