Residential delivery area · Maryland
ZIP Code 21012: Arnold, MD
ZIP code 21012 is in Arnold, Maryland, entirely in Anne Arundel County (Census 2020 ZIP-county file). About 23,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $139,432 (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Arnold · its only residential ZIP
- County
- Anne Arundel County
- Census places
- Arnold census-designated place
- Metro area
- Baltimore-Columbia-Towson, MD
- House district
- MD-3 119th Congress
- State
- Maryland
- Time zone
- Eastern
- Land area
- 9.8 sq mi · 2,308 people per sq mi
Where is ZIP code 21012?
21012 centers on 39.047°, -76.496° and covers 9.8 square miles of land plus 2.8 of water. It borders 6 ZIP codes: 21405, 21409, 21146, 21122, 21401, 21032.
The map draws ZIP code areas only. For the streets inside 21012, 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 21012 compare with the rest of Anne Arundel County?
| Measure | 21012 | In Anne Arundel County | In MD |
|---|---|---|---|
| People (ACS 2020-2024) | 22,570 | 12th of 42 | 115th of 477 |
| Median household income | $139k | 13th of 30 | 72nd of 293 |
| Median home value | $564k | 12th of 32 | 68th of 320 |
Its median household income is higher than in 95% of U.S. residential ZIP codes, and it is denser than 86% 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 21012?
The 2020 Census counted 22,377 people in 21012; the ACS, which samples households over 2020-2024, estimates 22,570. Between the 2010 and 2020 censuses its population grew 5.0% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 22,570
- 2020 Census count
- 22,377+5.0% since 2010 (21,317)
- Households
- 8,275
- Median age
- 38.0
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 21012?
Of the 22,570 people the ACS estimates in 21012, 25.3% are under 18 and 15.4% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (77.5%).
- Under 1825.3%
- 18 to 6459.3%
- 65 and older15.4%
- White, not Hispanic77.5%
- Hispanic or Latino10.0%
- Other or two or more5.9%
- Black, not Hispanic3.7%
- Asian, not Hispanic2.9%
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 21012 earn?
Median household income is $139,432 (ACS 2020-2024), the 13th highest of the 30 ranked ZIP codes in Anne Arundel County. It fell from $156,465 in 2015-2019 (in 2024 dollars), a change larger than the surveys' margins of error.
- Median household income
- $139,432
- Income per person
- $63,734
- Below the poverty line
- 3.3%
- Unemployed (of the labor force)
- 2.7%
- Adults 25+ with a bachelor's degree
- 57.5%
- Adjusted gross income per tax return, 2022
- $139,29010,980 returns; wages 66% 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 21012?
FHFA's house price index for 21012, built from repeat sales and appraisals of the same homes, rose 53% from 2015 to 2025 and rose 39% from 2020 to 2025, and moved +5.2% in 2025.
- Median home value (owners' estimate)
- $563,800
- Median gross rent
- $2,166
- Homes owned by their occupants
- 86.3%
- Housing units
- 8,542
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 21012?
404 business establishments had a location in this ZIP code in 2023, 17 more than in 2018; the most are in health care and social assistance (ZIP Code Business Patterns).
- Health care and social assistance73
- Construction52
- Professional, scientific, and technical services52
- Retail trade33
- Administrative and support and waste management and remediation services33
- Accommodation and food services33
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 21012?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 21405 | Annapolis | 495 | $161k | 3.1 mi |
| 21409 | Annapolis | 20,289 | $147k | 3.4 mi |
| 21146 | Severna Park | 28,591 | $172k | 4.1 mi |
| 21122 | Pasadena | 61,566 | $128k | 4.7 mi |
| 21401 | Annapolis | 38,629 | $123k | 5.1 mi |
| 21032 | Crownsville | 8,850 | $169k | 6.0 mi |
| 21056 | Gibson Island | 291 | $250k+ | 3.9 mi (near) |
| 21402 | Annapolis | 4,303 | $81k | 4.2 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.