ZIP code 21231
Where is ZIP code 21231?
Baltimore, Maryland
Baltimore city · Standard ZIP code
ZIP code 21231 belongs to Baltimore, Maryland in Baltimore city. 21231 is a standard ZIP code, so it covers street addresses as well as PO Boxes. It is in the Eastern Time zone and uses area codes 410, 443 and 667. About 14,969 people live in the 21231 area, where the median household income is $85,254. The closest ZIP codes are 21287 (Baltimore, 0.6 mi north), 21205 (Baltimore, 1 mi northeast) and 21202 (Baltimore, 1.2 mi northwest).
| ZIP code | 21231 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Baltimore |
| State | Maryland (MD) |
| County | Baltimore city |
| Time zone | Eastern Time · now |
| Area codes | 410, 443, 667 |
| Coordinates | 39.2892, -76.59 map |
| 3-digit prefix | 212 |
Population and income in 21231
| Population | 14,969 · higher than 68% of Maryland ZIP codes |
|---|---|
| People per square mile | 17,265 · higher than 100% of Maryland ZIP codes |
| Median age | 32.7 years · lower than 93% of Maryland ZIP codes |
| Men / women | 49% / 52% |
| Median household income | $85,254 · lower than 70% of Maryland ZIP codes |
| Income per person | $64,422 |
| Below the poverty line | 21% |
| Bachelor’s degree or higher | 64% of adults 25+ |
| Median home value | $350,100 · lower than 66% of Maryland ZIP codes |
| Median rent | $1,796 a month |
| Housing units | 9,514 |
| Households | 8,136 (1.83 people on average) |
| Owners / renters | 34% / 66% |
| Land area | 0.87 sq mi (plus 0.08 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 21231. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 21231
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 21287 | Baltimore, MD | 0.6 mi N | Standard |
| 21205 | Baltimore, MD | 1 mi NE | Standard |
| 21202 | Baltimore, MD | 1.2 mi NW | Standard |
| 21203 | Baltimore, MD | 1.7 mi W | PO Box only |
| 21233 | Baltimore, MD | 1.7 mi W | Standard |
| 21235 | Baltimore, MD | 1.7 mi W | Unique |
| 21241 | Baltimore, MD | 1.7 mi W | Unique |
| 21263 | Baltimore, MD | 1.7 mi W | Unique |
| 21264 | Baltimore, MD | 1.7 mi W | Unique |
| 21270 | Baltimore, MD | 1.7 mi W | PO Box only |
| 21273 | Baltimore, MD | 1.7 mi W | Unique |
| 21275 | Baltimore, MD | 1.7 mi W | Unique |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 21231 or measure the distance to another ZIP code.
How to address mail to 21231
123 MAIN ST
BALTIMORE MD 21231
Put the city, the two-letter state code and the ZIP code on the last line. Avoid Patterson: USPS doesn’t recognize it as the city for this ZIP code. Adding the 4-digit ZIP+4 code (21231-XXXX) helps mail sort faster but isn’t required.
Other ZIP codes in Baltimore, MD
- 21201
- 21202
- 21203
- 21205
- 21206
- 21209
- 21210
- 21211
- 21212
- 21213
- 21214
- 21215
- 21216
- 21217
- 21218
- 21223
- 21224
- 21229
- 21230
- 21233
- 21235
- 21239
- 21240
- 21241
- 21250
- 21251
- 21263
- 21264
- 21270
- 21273
- 21275
- 21278
- 21279
- 21281
- 21287
- 21289
- 21290
- 21297
- 21298
All Baltimore ZIP codes with population and income →
Questions
- What city is ZIP code 21231?
- 21231 is a Baltimore, Maryland ZIP code.
- What county is 21231 in?
- ZIP code 21231 is in Baltimore city, Maryland.
- What time zone is ZIP code 21231 in?
- 21231 is in the Eastern Time zone (America/New_York).
- What area code is 21231?
- Phone numbers in ZIP code 21231 use area codes 410, 443 and 667.
- What is the population of ZIP code 21231?
- About 14,969 people live in ZIP code 21231, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 21231?
- The median household income in 21231 is $85,254 a year, lower than 70% of Maryland ZIP codes.
- What ZIP codes are near 21231?
- The nearest ZIP codes to 21231 are 21287 (Baltimore, 0.6 miles), 21205 (Baltimore, 1 miles), 21202 (Baltimore, 1.2 miles) and 21203 (Baltimore, 1.7 miles).