| ZIP Codes: | 39 ZIP Codes (23 Standard, 4 PO Box, 12 Unique) [See All] |
| Area Codes: | 227 / 301 / 410 / 443 / 667 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:12:28 PM |
| Population: | 622,980 [See All] |
| FIPS: | 24510 |
| CBSA: | Baltimore-Columbia-Towson, MD |
| Land Area: | 92 sq mi |
| Water Area: | 6 sq mi |
| Coordinates: | 39.3078, -76.6178 |
| Quick Link: |
622,980 residents live across 39 ZIPs covering 92 sq mi, served by 2 distinct USPS-recognized cities.
Population moved from 664,378 to 622,980 from 2014 to 2024 — a -6.2% change. 7 ZIPs gained residents, 15 lost.
The county's wealthiest ZIP 21210 (Baltimore, $112,428 median) and poorest ZIP 21217 (Baltimore, $38,409) are 3.4 miles apart — a 2.9× income gap across local geography.
Median home values vary 5.7× across this county — from $96,100 in 21205 (Baltimore) to $547,300 in 21210 (Baltimore).
Density varies 4× across the county — from 4,023 people/sq mi in 21230 (Baltimore) to 15,729 in 21231 (Baltimore).
Most of the decade's growth concentrated around Baltimore — top growth ZIPs averaged +12.1% over the past ten years ( 21216 , 21201 and 21209 ).
Educational attainment ranges from 15.6% bachelor's+ in 21223 (Baltimore) to 83.6% in 21210 (Baltimore) — the breadth of educational profiles across the area.
Within Maryland, this is the #4 most populous of 24 counties and ranks #22 for median household income .
On the national stage, Baltimore City County is .
Hosts 4 single-entity Unique ZIPs: 21235Social Security Administrat ; 21251Morgan State University ; 21290Social Security Admin ; and 21278Baltimore Sunpapers .
Weighted by population, the typical household earns about $66,731 across the county — reflecting what a typical resident sees, not a simple ZIP average.
37.6% of adults age 25+ hold a bachelor's degree or higher (162,538 of 432,640 reporting). The most-educated ZIPs cluster around Baltimore.
23 Standard delivery, 4 PO Box only, 12 single-entity Unique ZIPs serve this county.
4 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
12 ZIP codes in this county serve a single facility — typically theme parks, universities, large corporations, airports, or government complexes.
Baltimore City County lost 6.2% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 21215 | Baltimore | Standard | 52,229 | $51,587 | 6.8 | -18.1% |
| 21206 | Baltimore | Standard | 48,902 | $64,531 | 7.2 | -2.6% |
| 21224 | Baltimore | Standard | 47,465 | $89,017 | 10.3 | -3.8% |
| 21229 | Baltimore | Standard | 46,679 | $60,047 | 6.1 | 0.0% |
| 21218 | Baltimore | Standard | 44,014 | $62,488 | 4.5 | -10.6% |
| 21225 | Brooklyn | Standard | 34,062 | $54,020 | 7.3 | 2.9% |
| 21212 | Baltimore | Standard | 33,974 | $96,685 | 4.6 | 3.0% |
| 21230 | Baltimore | Standard | 32,977 | $91,842 | 8.2 | -4.3% |
| 21217 | Baltimore | Standard | 30,792 | $38,409 | 2.2 | -24.2% |
| 21209 | Baltimore | Standard | 30,126 | $91,437 | 6.6 | 8.3% |
| 21216 | Baltimore | Standard | 29,426 | $42,031 | 3.4 | 14.9% |
| 21213 | Baltimore | Standard | 28,058 | $51,344 | 3.4 | -5.8% |
| 21239 | Baltimore | Standard | 27,346 | $62,650 | 3.0 | -13.1% |
| 21214 | Baltimore | Standard | 21,092 | $86,366 | 2.9 | 1.3% |
| 21202 | Baltimore | Standard | 20,683 | $59,377 | 1.7 | -4.5% |
| 21223 | Baltimore | Standard | 19,572 | $45,840 | 2.7 | -21.3% |
| 21201 | Baltimore | Standard | 18,307 | $45,640 | 1.3 | 13.1% |
| 21231 | Baltimore | Standard | 14,969 | $85,254 | 1.0 | -12.7% |
| 21211 | Baltimore | Standard | 14,969 | $82,828 | 2.9 | -12.4% |
| 21210 | Baltimore | Standard | 14,134 | $112,428 | 3.4 | -5.0% |
| 21205 | Baltimore | Standard | 13,013 | $43,176 | 2.1 | -18.0% |
| 21251 | Baltimore | Unique | 191 | — | 0.0 | -76.7% |
| 21233 | Baltimore | Standard | 0 | — | 0.0 | — |
| 21287 | Baltimore | Standard | 0 | — | 0.1 | — |
| 21278 | Baltimore | Unique | — | — | 0.0 | — |
| 21281 | Baltimore | PO Box | — | — | 0.0 | — |
| 21289 | Baltimore | Unique | — | — | 0.0 | — |
| 21297 | Baltimore | PO Box | — | — | 0.0 | — |
| 21298 | Baltimore | Unique | — | — | 0.0 | — |
| 21275 | Baltimore | Unique | — | — | 0.0 | — |
| 21273 | Baltimore | Unique | — | — | 0.0 | — |
| 21279 | Baltimore | Unique | — | — | 0.0 | — |
| 21264 | Baltimore | Unique | — | — | 0.0 | — |
| 21263 | Baltimore | Unique | — | — | 0.0 | — |
| 21203 | Baltimore | PO Box | — | — | 0.0 | — |
| 21290 | Baltimore | Unique | — | — | 0.0 | — |
| 21241 | Baltimore | Unique | — | — | 0.0 | — |
| 21235 | Baltimore | Unique | — | — | 0.4 | — |
| 21270 | Baltimore | PO Box | — | — | 0.0 | — |