County ZIP codes · Maryland · FIPS 24005
Baltimore County, MD ZIP Codes
Baltimore County, Maryland has 66 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 57 residential and 9 for PO boxes or a single organization. 44 of the residential ones lie mainly in Baltimore County and 13 mainly in a neighboring county; 28 cross the county line. Median household income ranges from $51,587 in 21215 (Baltimore) to $197,619 in 21131 (Phoenix) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Baltimore County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $85,114 and $121,350.
They carry 46 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 57 residential ZIP codes in Baltimore County
44 ZIP codes lie mainly in Baltimore County; 13 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 21234 | Parkville | 66,334 | 4,967 | $84k | $288k | 93% |
| 21117 | Owings Mills | 62,816 | 2,114 | $102k | $387k | 100% |
| 21222 | Dundalk | 59,407 | 5,164 | $64k | $216k | 94% |
| 21228 | Catonsville | 50,492 | 3,241 | $113k | $405k | 100% |
| 21207 | Gwynn Oak | 47,099 | 4,553 | $67k | $260k | 72% |
| 21221 | Essex | 43,487 | 2,893 | $67k | $272k | 100% |
| 21220 | Middle River | 42,824 | 2,022 | $82k | $300k | 100% |
| 21236 | Nottingham | 39,514 | 4,430 | $95k | $327k | 98% |
| 21093 | Lutherville Timonium | 39,100 | 1,933 | $126k | $478k | 100% |
| 21244 | Windsor Mill | 38,208 | 2,703 | $85k | $283k | 100% |
| 21208 | Pikesville | 37,276 | 2,969 | $90k | $338k | 99% |
| 21227 | Halethorpe | 34,907 | 3,080 | $86k | $289k | 97% |
| 21136 | Reisterstown | 32,088 | 571 | $119k | $422k | 96% |
| 21237 | Rosedale | 31,425 | 2,793 | $92k | $296k | 94% |
| 21133 | Randallstown | 31,398 | 3,504 | $81k | $323k | 100% |
| 21209 | Baltimore | 30,126 | 4,665 | $91k | $441k | 56% |
| 21030 | Cockeysville | 25,827 | 1,074 | $89k | $451k | 100% |
| 21286 | Towson | 21,853 | 2,543 | $94k | $430k | 100% |
| 21204 | Towson | 19,845 | 3,169 | $100k | $595k | 100% |
| 21128 | Perry Hall | 15,501 | 2,277 | $128k | $450k | 100% |
| 21219 | Sparrows Point | 9,565 | 789 | $110k | $385k | 100% |
| 21163 | Woodstock | 7,539 | 553 | $135k | $603k | 73% |
| 21120 | Parkton | 7,440 | 177 | $162k | $581k | 100% |
| 21131 | Phoenix | 7,141 | 340 | $198k | $686k | 100% |
| 21152 | Sparks Glencoe | 6,459 | 267 | $121k | $496k | 100% |
| 21013 | Baldwin | 5,610 | 374 | $171k | $572k | 71% |
| 21087 | Kingsville | 5,537 | 378 | $129k | $534k | 90% |
| 21252 | Towson | 4,865 | 19,538 | – | – | 100% |
| 21111 | Monkton | 4,714 | 133 | $136k | $607k | 77% |
| 21162 | White Marsh | 4,639 | 651 | $158k | $452k | 100% |
| 21057 | Glen Arm | 4,386 | 276 | $146k | $623k | 100% |
| 21155 | Upperco | 3,313 | 150 | $123k | $480k | 89% |
| 21053 | Freeland | 2,929 | 135 | $90k | $408k | 100% |
| 21250 | Baltimore | 2,834 | 11,567 | – | – | 100% |
| 21082 | Hydes | 626 | 104 | $146k | $486k | 97% |
| 21153 | Stevenson | 456 | 159 | $220k | $902k | 100% |
| 21052 | Fort Howard | 409 | 1,017 | $77k | $293k | 100% |
| 21071 | Glyndon | 404 | 269 | $214k | $451k | 100% |
| 21156 | Upper Falls | 204 | 194 | – | $794k | 100% |
| 21051 | Fork | 172 | 432 | $233k | $699k | 100% |
| 21023 | Butler | 66 | 62 | $85k | $882k | 100% |
| 21105 | Maryland Line | 36 | 419 | – | – | 100% |
| 21031 | Hunt Valley | 26 | 28 | – | – | 100% |
| 21285 | Towson | 3 | 17 | – | – | 100% |
Partly in Baltimore County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 21161 | White Hall | 5,221 | 108 | $108k | $473k | 47% |
| 21212 | Baltimore | 33,974 | 7,408 | $97k | $374k | 43% |
| 21206 | Baltimore | 48,902 | 6,742 | $65k | $216k | 31% |
| 21074 | Hampstead | 14,777 | 392 | $109k | $378k | 28% |
| 21224 | Baltimore | 47,465 | 5,090 | $89k | $295k | 27% |
| 21239 | Baltimore | 27,346 | 9,330 | $63k | $207k | 27% |
| 21102 | Manchester | 12,162 | 299 | $135k | $393k | 23% |
| 21210 | Baltimore | 14,134 | 4,100 | $112k | $547k | 16% |
| 21104 | Marriottsville | 6,052 | 355 | $192k | $680k | 15% |
| 21229 | Baltimore | 46,679 | 7,864 | $60k | $201k | 14% |
| 21085 | Joppa | 17,307 | 912 | $114k | $349k | 6% |
| 21215 | Baltimore | 52,229 | 7,667 | $52k | $201k | 3% |
| 21043 | Ellicott City | 48,525 | 2,838 | $148k | $621k | 3% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
28 ZIP codes of Baltimore County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Baltimore | Elsewhere |
|---|---|---|
| 21234 | 93% | Baltimore city 7% |
| 21222 | 94% | Baltimore city 6% |
| 21215 | 3% | Baltimore city 97% |
| 21206 | 31% | Baltimore city 69% |
| 21043 | 3% | Howard County 97% |
| 21224 | 27% | Baltimore city 73% |
| 21207 | 72% | Baltimore city 28% |
| 21229 | 14% | Baltimore city 86% |
| 21236 | 98% | Baltimore city 2% |
| 21208 | 99% | Baltimore city 1% |
| 21227 | 97% | Baltimore city 3% |
| 21212 | 43% | Baltimore city 57% |
| 21136 | 96% | Carroll County 4% |
| 21237 | 94% | Baltimore city 6% |
| 21209 | 56% | Baltimore city 44% |
| 21239 | 27% | Baltimore city 73% |
| 21085 | 6% | Harford County 94% |
| 21074 | 28% | Carroll County 72% |
| 21210 | 16% | Baltimore city 84% |
| 21102 | 23% | Carroll County 77% |
| 21163 | 73% | Howard County 27% |
| 21104 | 15% | Howard County 53%; Carroll County 32% |
| 21013 | 71% | Harford County 29% |
| 21087 | 90% | Harford County 10% |
| 21161 | 47% | Harford County 53% |
| 21111 | 77% | Harford County 23% |
| 21155 | 89% | Carroll County 11% |
| 21082 | 97% | Harford County 3% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Baltimore County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Baltimore County's ZIP codes use 3 prefixes: 210, 211 and 212.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 210 | Linthicum, MD (SCF 210) | 21 | 58 |
| 211 | Linthicum, MD (SCF 210) | 18 | 34 |
| 212 | Baltimore, MD (SCF 212) | 27 | 62 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.