Residential delivery area · Maryland
ZIP Code 21204: Towson, MD
ZIP code 21204 is in Towson, Maryland, entirely in Baltimore County (Census 2020 ZIP-county file). About 20,000 people live there (Census Bureau, ACS 2020-2024), the 2nd most populous of Towson's 4 residential ZIP codes. Median household income is $99,606 (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Towson · 4 residential ZIPs
- County
- Baltimore County
- Census places
- Towson census-designated place
- Metro area
- Baltimore-Columbia-Towson, MD
- House district
- MD-2 119th Congress
- State
- Maryland
- Time zone
- Eastern
- Land area
- 6.3 sq mi · 3,169 people per sq mi
- PO Box ZIPs
- 21284 also use the name Towson
Where is ZIP code 21204?
21204 centers on 39.406°, -76.626° and covers 6.3 square miles of land plus 0.1 of water. It borders 8 ZIP codes: 21252, 21285, 21093, 21212, 21286, 21209, 21210, 21208.
The map draws ZIP code areas only. For the streets inside 21204, 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 21204 compare with the rest of Towson?
| Measure | 21204 | In Towson | In Baltimore County | In MD |
|---|---|---|---|---|
| People (ACS 2020-2024) | 19,845 | 2nd of 4 | 26th of 57 | 127th of 477 |
| Median household income | $100k | 1st of 2 | 21st of 42 | 172nd of 293 |
| Median home value | $595k | 1st of 2 | 7th of 45 | 54th of 320 |
Its median household income is higher than in 81% of U.S. residential ZIP codes, and it is denser than 89% 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 21204?
The 2020 Census counted 20,967 people in 21204; the ACS, which samples households over 2020-2024, estimates 19,845. Between the 2010 and 2020 censuses its population grew 3.5% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 19,845
- 2020 Census count
- 20,967+3.5% since 2010 (20,253)
- Households
- 8,747
- Median age
- 34.8
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 21204?
Of the 19,845 people the ACS estimates in 21204, 15.8% are under 18 and 20.5% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (70.2%), then Black (not Hispanic) (14.9%).
- Under 1815.8%
- 18 to 6463.6%
- 65 and older20.5%
- White, not Hispanic70.2%
- Black, not Hispanic14.9%
- Other or two or more5.1%
- Hispanic or Latino5.0%
- Asian, not Hispanic4.9%
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 21204 earn?
Median household income is $99,606 (ACS 2020-2024), the 21st highest of the 42 ranked ZIP codes in Baltimore County. It is not measurably different from 2015-2019 ($101,417 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $99,606±$11,866
- Income per person
- $67,450
- Below the poverty line
- 14.9%
- Unemployed (of the labor force)
- 3.8%
- Adults 25+ with a bachelor's degree
- 73.1%
- Adjusted gross income per tax return, 2022
- $189,1038,970 returns; wages 52% 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 21204?
FHFA's house price index for 21204, built from repeat sales and appraisals of the same homes, rose 33% from 2015 to 2025 and rose 25% from 2020 to 2025, and moved −1.7% in 2025.
- Median home value (owners' estimate)
- $594,800
- Median gross rent
- $1,875
- Homes owned by their occupants
- 45.7%
- Housing units
- 9,588
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 21204?
1,419 business establishments had a location in this ZIP code in 2023, 119 fewer than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services333
- Health care and social assistance306
- Retail trade179
- Finance and insurance131
- Accommodation and food services119
- Real estate and rental and leasing94
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 21204?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 21252 | Towson | 4,865 | – | 1.2 mi |
| 21285 | Towson | 3 | – | 1.4 mi |
| 21093 | Lutherville Timonium | 39,100 | $126k | 2.3 mi |
| 21212 | Baltimore | 33,974 | $97k | 2.8 mi |
| 21286 | Towson | 21,853 | $94k | 2.8 mi |
| 21209 | Baltimore | 30,126 | $91k | 2.9 mi |
| 21210 | Baltimore | 14,134 | $112k | 3.4 mi |
| 21208 | Pikesville | 37,276 | $90k | 5.5 mi |
| 21239 | Baltimore | 27,346 | $63k | 3.5 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.