Residential delivery area · Maryland
ZIP Code 21231: Baltimore, MD
ZIP code 21231 is in Baltimore, Maryland, entirely in Baltimore city (Census 2020 ZIP-county file). About 15,000 people live there (Census Bureau, ACS 2020-2024), the 17th most populous of Baltimore's 25 residential ZIP codes. Median household income is $85,254 (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Baltimore · 25 residential ZIPs
- County
- Baltimore city
- Census places
- Baltimore
- Neighborhoods
- Upper Fells Point, Washington Hill GeoNames
- Metro area
- Baltimore-Columbia-Towson, MD
- House district
- MD-7 119th Congress
- State
- Maryland
- Time zone
- Eastern
- Land area
- 0.9 sq mi · 17,265 people per sq mi
- PO Box ZIPs
- 17 more ZIP codes use the name Baltimore for PO boxes or single organizations
Where is ZIP code 21231?
21231 centers on 39.289°, -76.592° and covers 0.9 square miles of land plus 0.1 of water. It borders 4 ZIP codes: 21202, 21205, 21230, 21224.
The map draws ZIP code areas only. For the streets inside 21231, 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 21231 compare with the rest of Baltimore?
| Measure | 21231 | In Baltimore | In Baltimore city | In MD |
|---|---|---|---|---|
| People (ACS 2020-2024) | 14,969 | 17th of 25 | 25th of 32 | 150th of 477 |
| Median household income | $85k | 7th of 20 | 11th of 29 | 218th of 293 |
| Median home value | $350k | 4th of 19 | 4th of 28 | 227th of 320 |
Its median household income is higher than in 68% of U.S. residential ZIP codes, and it is denser than 99% 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 21231?
The 2020 Census counted 17,062 people in 21231; the ACS, which samples households over 2020-2024, estimates 14,969. Between the 2010 and 2020 censuses its population grew 8.3% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 14,969
- 2020 Census count
- 17,062+8.3% since 2010 (15,748)
- Households
- 8,136
- Median age
- 32.7
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 21231?
Of the 14,969 people the ACS estimates in 21231, 13.5% are under 18 and 9.2% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (55.6%), then Black (not Hispanic) (26.5%).
- Under 1813.5%
- 18 to 6477.3%
- 65 and older9.2%
- White, not Hispanic55.6%
- Black, not Hispanic26.5%
- Hispanic or Latino7.3%
- Asian, not Hispanic5.3%
- Other or two or more5.2%
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 21231 earn?
Median household income is $85,254 (ACS 2020-2024), the 11th highest of the 29 ranked ZIP codes in Baltimore city. It is not measurably different from 2015-2019 ($87,617 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $85,254
- Income per person
- $64,422
- Below the poverty line
- 20.6%
- Unemployed (of the labor force)
- 4.2%
- Adults 25+ with a bachelor's degree
- 64.3%
- Adjusted gross income per tax return, 2022
- $101,2468,200 returns; wages 77% 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 21231?
FHFA's house price index for 21231, built from repeat sales and appraisals of the same homes, rose 26% from 2015 to 2025 and rose 20% from 2020 to 2025, and moved +4.7% in 2025.
- Median home value (owners' estimate)
- $350,100
- Median gross rent
- $1,796
- Homes owned by their occupants
- 34.2%
- Housing units
- 9,514
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 21231?
509 business establishments had a location in this ZIP code in 2023, 19 more than in 2018; the most are in accommodation and food services (ZIP Code Business Patterns).
- Accommodation and food services112
- Professional, scientific, and technical services75
- Retail trade65
- Other services (except public administration)56
- Real estate and rental and leasing38
- Health care and social assistance37
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 21231?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 21202 | Baltimore | 20,683 | $59k | 1.0 mi |
| 21205 | Baltimore | 13,013 | $43k | 1.8 mi |
| 21230 | Baltimore | 32,977 | $92k | 2.3 mi |
| 21224 | Baltimore | 47,465 | $89k | 2.8 mi |
| 21233 | Baltimore | 0 | – | 0.7 mi (near) |
| 21287 | Baltimore | 0 | – | 0.8 mi (near) |
| 21201 | Baltimore | 18,307 | $46k | 1.7 mi (near) |
| 21213 | Baltimore | 28,058 | $51k | 2.0 mi (near) |
| 21217 | Baltimore | 30,792 | $38k | 2.8 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.