Residential delivery area · Maryland
ZIP Code 21090: Linthicum (Linthicum Heights), MD
ZIP code 21090 is in Linthicum (postal name Linthicum Heights), Maryland, entirely in Anne Arundel County (Census 2020 ZIP-county file). About 11,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $138,119 (Census Bureau, ACS 2020-2024). By Census place, 79% of its land lies in Linthicum (a census-designated place); 21% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Linthicum Heights · its only residential ZIP
- County
- Anne Arundel County
- Census places
- Linthicum census-designated place
- Metro area
- Baltimore-Columbia-Towson, MD
- House district
- MD-3 119th Congress
- State
- Maryland
- Time zone
- Eastern
- Land area
- 6.6 sq mi · 1,604 people per sq mi
Where is ZIP code 21090?
21090 centers on 39.210°, -76.665° and covers 6.6 square miles of land plus 0.1 of water. It borders 5 ZIP codes: 21227, 21240, 21225, 21061, 21076.
The map draws ZIP code areas only. For the streets inside 21090, 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 21090 compare with the rest of Anne Arundel County?
| Measure | 21090 | In Anne Arundel County | In MD |
|---|---|---|---|
| People (ACS 2020-2024) | 10,652 | 20th of 42 | 177th of 477 |
| Median household income | $138k | 14th of 30 | 76th of 293 |
| Median home value | $410k | 26th of 32 | 173rd of 320 |
Its median household income is higher than in 95% of U.S. residential ZIP codes, and it is denser than 83% 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 21090?
The 2020 Census counted 10,623 people in 21090; the ACS, which samples households over 2020-2024, estimates 10,652. Between the 2010 and 2020 censuses its population grew 8.6% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 10,652±1,144 (90% margin)
- 2020 Census count
- 10,623+8.6% since 2010 (9,784)
- Households
- 3,979
- Median age
- 36.8
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 21090?
Of the 10,652 people the ACS estimates in 21090, 23.6% are under 18 and 15.2% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (75.1%).
- Under 1823.6%
- 18 to 6461.2%
- 65 and older15.2%
- White, not Hispanic75.1%
- Black, not Hispanic9.0%
- Other or two or more5.9%
- Hispanic or Latino5.7%
- Asian, not Hispanic4.3%
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 21090 earn?
Median household income is $138,119 (ACS 2020-2024), the 14th highest of the 30 ranked ZIP codes in Anne Arundel County. It rose from $119,541 in 2015-2019 (in 2024 dollars), a change larger than the surveys' margins of error.
- Median household income
- $138,119
- Income per person
- $55,969
- Below the poverty line
- 3.5%
- Unemployed (of the labor force)
- 2.6%
- Adults 25+ with a bachelor's degree
- 42.8%
- Adjusted gross income per tax return, 2022
- $90,1115,650 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 21090?
FHFA's house price index for 21090, built from repeat sales and appraisals of the same homes, rose 56% from 2015 to 2025 and rose 35% from 2020 to 2025, and moved +2.5% in 2025.
- Median home value (owners' estimate)
- $410,400
- Median gross rent
- $2,055
- Homes owned by their occupants
- 83.2%
- Housing units
- 4,255
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 21090?
554 business establishments had a location in this ZIP code in 2023, 52 fewer than in 2018; the most are in accommodation and food services (ZIP Code Business Patterns).
- Accommodation and food services81
- Professional, scientific, and technical services71
- Construction63
- Administrative and support and waste management and remediation services44
- Health care and social assistance44
- Wholesale trade40
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 21090?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 21227 | Halethorpe | 34,907 | $86k | 2.2 mi |
| 21240 | Baltimore | 0 | – | 2.4 mi |
| 21225 | Brooklyn | 34,062 | $54k | 2.9 mi |
| 21061 | Glen Burnie | 57,230 | $88k | 3.8 mi |
| 21076 | Hanover | 24,268 | $147k | 4.1 mi |
| 21077 | Harmans | 63 | – | 4.0 mi (near) |
| 21250 | Baltimore | 2,834 | – | 4.0 mi (near) |
| 21230 | Baltimore | 32,977 | $92k | 4.5 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.