21231 ZIP Code, Baltimore, MD
21231 is a ZIP code in Baltimore, Maryland in Baltimore city. It covers 0.9 square miles of land. The closest ZIP codes are 21233, 21287 and 21202. 14,969 people live here in 8,136 households. It is densely built, at about 17,265 people per square mile, and most households rent (34% own). Median household income is $85,254, below the Maryland median of $103,678; 25% of residents moved in during the past year.
Quick facts
- Mailing city: Baltimore, MD
- County: Baltimore city County
- Land area: 0.9 sq mi
- Population: 14,969
- Median household income: $85,254
Key figures
| Measure | Value |
|---|---|
| Residents | 14,969 |
| Households | 8,136 |
| Median household income | $85,254 |
| Income per person | $64,422 |
| Median age | 32.7 |
| Homeowners | 34.2% |
| Median home value | $350,100 |
| Median rent | $1,796 |
| Bachelor's degree or higher | 64.3% |
| Average commute (minutes) | 24.1 |
| Households with kids under 18 | 12.7% |
| Moved in the past year | 24.9% |
| Below the poverty line | 20.6% |
| Broadband internet | 93.2% |
| Speak a non-English language at home | 14.2% |
Household income
| % of households | Value |
|---|---|
| <$10K | 8.8% |
| $10–15K | 2.7% |
| $15–25K | 5.2% |
| $25–35K | 4.4% |
| $35–50K | 7.3% |
| $50–75K | 15.7% |
| $75–100K | 11.0% |
| $100–150K | 16.6% |
| $150–200K | 9.8% |
| $200K+ | 18.3% |
Age
| % of all residents | Value |
|---|---|
| <10 | 8.3% |
| 10–19 | 6.1% |
| 20–24 | 8.4% |
| 25–34 | 32.8% |
| 35–44 | 17.2% |
| 45–54 | 10.0% |
| 55–64 | 8.2% |
| 65–74 | 6.0% |
| 75+ | 3.2% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 22.3% |
| Owned outright | 7.1% |
| Rented | 56.2% |
| Vacant | 14.5% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 2.6% |
| Townhome | 48.5% |
| 2–4 units | 12.5% |
| 5–19 units | 8.2% |
| 20+ units | 28.1% |
| Mobile / other | 0.1% |
Businesses in 21231
509 business establishments with 9,784 employees (ZIP Codes Business Patterns 2023).
- Accommodation and Food Services: 112
- Professional, Scientific, and Technical Services: 75
- Retail Trade: 65
- Other Services (except Public Administration): 56
- Real Estate and Rental and Leasing: 38
- Health Care and Social Assistance: 37
- Finance and Insurance: 26
- Construction: 17
EDDM carrier routes
See every USPS carrier route in 21231 with residential and business mailbox counts on the route map. Open the EDDM route map.
Nearby ZIP codes
- 21233 — Baltimore city, MD (0.7 mi)
- 21287 — Baltimore city, MD (0.8 mi)
- 21202 — Baltimore city, MD (1 mi)
- 21201 — Baltimore city, MD (1.7 mi)
- 21205 — Baltimore city, MD (1.8 mi)
- 21213 — Baltimore city, MD (2 mi)
- 21230 — Baltimore city, MD (2.3 mi)
- 21217 — Baltimore city, MD (2.8 mi)
Areas that include 21231
- Baltimore, MD ZIP codes — 28 ZIP codes
- Baltimore city County ZIP codes — 26 ZIP codes
- Maryland ZIP code data
Where it ranks
- No. 7 of 23: highest median household income in Baltimore city
- No. 4 of 23: highest median home value in Baltimore city
- No. 2 of 23: highest share of residents who moved in during the past year in Baltimore city
- No. 2 of 23: lowest median age in Baltimore city
- No. 7 of 23: highest median household income in Baltimore, MD
- No. 4 of 23: highest median home value in Baltimore, MD
- No. 3 of 24: highest share of residents who moved in during the past year in Baltimore, MD
- No. 3 of 24: lowest median age in Baltimore, MD
Mail every home in 21231
Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.
Baltimore EDDM mailing
EDDM guides
ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 21231, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 21231 in?
- 21231 is a Baltimore, MD mailing address. By land area, 100% lies inside Baltimore.
- What county is 21231 in?
- 21231 is in Baltimore city.
- What is the population of 21231?
- About 14,969 people (±1,076), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 17,062.
- What is the median household income in 21231?
- $85,254 (±$8,370), compared with $103,678 for Maryland as a whole. Half the households in the ZIP code earn more and half earn less.
- How many carrier routes and mailboxes are in 21231?
- EDDM2GO's stored route library does not include 21231 yet. The EDDM route map loads its carrier routes and mailbox counts when you search the ZIP code.
- What ZIP codes are near 21231?
- The closest, measured center to center: 21233 (0.7 mi, Baltimore), 21287 (0.8 mi, Baltimore), 21202 (1 mi, Baltimore), 21201 (1.7 mi, Baltimore), 21205 (1.8 mi, Baltimore) and 21213 (2 mi, Baltimore).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.