Residential delivery area · Maryland
ZIP Code 21921: Elkton, MD
ZIP code 21921 uses the postal name Elkton, Maryland and lies entirely in Cecil County (Census 2020 ZIP-county file). About 46,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $85,775 (Census Bureau, ACS 2020-2024). By Census place, 9% of its land lies in Elkton; 90% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Elkton · its only residential ZIP
- County
- Cecil County
- Census places
- Elkton
- Neighborhoods
- Buckhill Farms, Delancy Village, Elkwood Estates, Gilpin Manor, Glen Mary Heights, Heritage Valley and 7 more GeoNames
- Metro area
- Philadelphia-Camden-Wilmington, PA-NJ-DE-MD
- House district
- MD-1 119th Congress
- State
- Maryland
- Time zone
- Eastern
- Land area
- 94.7 sq mi · 481 people per sq mi
- PO Box ZIPs
- 21922 also use the name Elkton
Where is ZIP code 21921?
21921 centers on 39.627°, -75.860° and covers 94.7 square miles of land plus 5.5 of water. It borders 9 ZIP codes: 21920, 21901, 19702, 19713, 19711, 21915, 19350, 21911, 19363.
The map draws ZIP code areas only. For the streets inside 21921, 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); neighborhoods from the GeoNames gazetteer (CC BY 4.0), placed in this ZIP code by PlainZIP.
How does 21921 compare with the rest of Cecil County?
| Measure | 21921 | In Cecil County | In MD |
|---|---|---|---|
| People (ACS 2020-2024) | 45,527 | 1st of 15 | 28th of 477 |
| Median household income | $86k | 6th of 7 | 217th of 293 |
| Median home value | $330k | 7th of 9 | 244th of 320 |
Its median household income is higher than in 69% of U.S. residential ZIP codes, and it is denser than 72% 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 21921?
The 2020 Census counted 44,983 people in 21921; the ACS, which samples households over 2020-2024, estimates 45,527. Between the 2010 and 2020 censuses its population grew 1.2% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 45,527
- 2020 Census count
- 44,983+1.2% since 2010 (44,471)
- Households
- 17,316
- Median age
- 39.4
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 21921?
Of the 45,527 people the ACS estimates in 21921, 22.9% are under 18 and 16.8% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (75.0%).
- Under 1822.9%
- 18 to 6460.3%
- 65 and older16.8%
- White, not Hispanic75.0%
- Black, not Hispanic9.8%
- Other or two or more7.0%
- Hispanic or Latino6.7%
- Asian, not Hispanic1.4%
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 21921 earn?
Median household income is $85,775 (ACS 2020-2024), the 6th highest of the 7 ranked ZIP codes in Cecil County. It is not measurably different from 2015-2019 ($89,560 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $85,775
- Income per person
- $40,249
- Below the poverty line
- 13.6%
- Unemployed (of the labor force)
- 4.5%
- Adults 25+ with a bachelor's degree
- 28.8%
- Adjusted gross income per tax return, 2022
- $74,55420,760 returns; wages 75% 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 21921?
FHFA's house price index for 21921, built from repeat sales and appraisals of the same homes, rose 75% from 2015 to 2025 and rose 51% from 2020 to 2025, and moved +8.9% in 2025.
- Median home value (owners' estimate)
- $330,400
- Median gross rent
- $1,421
- Homes owned by their occupants
- 69.8%
- Housing units
- 18,475
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 21921?
802 business establishments had a location in this ZIP code in 2023, 52 fewer than in 2018; the most are in health care and social assistance (ZIP Code Business Patterns).
- Health care and social assistance128
- Retail trade104
- Other services (except public administration)101
- Construction79
- Accommodation and food services72
- Professional, scientific, and technical services67
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 21921?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 21920 | Elk Mills | 1,413 | $124k | 2.2 mi |
| 21901 | North East | 19,514 | $114k | 6.5 mi |
| 19702 | Newark, DE | 55,683 | $92k | 7.0 mi |
| 19713 | Newark, DE | 30,747 | $77k | 8.5 mi |
| 19711 | Newark, DE | 49,432 | $95k | 8.7 mi |
| 21915 | Chesapeake City | 2,471 | $96k | 9.1 mi |
| 19350 | Landenberg, PA | 10,945 | $144k | 9.8 mi |
| 21911 | Rising Sun | 10,551 | $105k | 10.3 mi |
| 19363 | Oxford, PA | 18,231 | $107k | 12.5 mi |
| 19716 | Newark, DE | 0 | – | 6.7 mi (near) |
| 19717 | Newark, DE | 6,036 | – | 6.8 mi (near) |
| 21914 | Charlestown | 810 | $67k | 7.5 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.
Which other ZIP codes use the name Elkton?
1 more ZIP code carries the postal name Elkton, MD without a residential delivery area: PO boxes at the post office, or a single organization with its own ZIP code. The Census Bureau publishes no figures for it.
| ZIP | County |
|---|---|
| 21922 | Cecil County |
Source: GeoNames postal codes (CC BY 4.0), downloaded 2026-10-09; a ZIP code with no Census ZCTA has no residential delivery area.