| Zip Code | Primary City | Secondary City | More Information |
| 21204 | Towson | Baltimore | Baltimore population stats |
| 21207 | Gwynn Oak | Baltimore | Baltimore population stats |
| 21208 | Pikesville | Baltimore | Baltimore population stats |
| 21219 | Sparrows Point | Baltimore | Baltimore population stats |
| 21219 | Sparrows Point | Edgemere | Edgemere population stats |
| 21219 | Sparrows Point | Sparrows Pt | |
| 21220 | Middle River | Baltimore | Baltimore population stats |
| 21221 | Essex | Baltimore | Baltimore population stats |
| 21222 | Dundalk | Baltimore | Baltimore population stats |
| 21225 | Baltimore | Baltimore | Baltimore population stats |
| 21226 | Curtis Bay | Baltimore | Baltimore population stats |
| 21227 | Halethorpe | Baltimore | Baltimore population stats |
| 21228 | Catonsville | Baltimore | Baltimore population stats |
| 21234 | Parkville | Baltimore | Baltimore population stats |
| 21236 | Nottingham | Baltimore | Baltimore population stats |
| 21237 | Rosedale | Baltimore | Baltimore population stats |
| 21244 | Windsor Mill | Baltimore | Baltimore population stats |
| 21252 | Towson | Baltimore | Baltimore population stats |
| 21286 | Towson | Baltimore | Baltimore population stats |
| 21219 | Sparrows Point | Dundalk Sparrows Point | |
| 21222 | Dundalk | Dundalk Sparrows Point | |
| 21201 | Baltimore | Baltimore | Baltimore population stats |
| 21202 | Baltimore | Baltimore | Baltimore population stats |
| 21203 | Baltimore | Baltimore | Baltimore population stats |
| 21205 | Baltimore | Baltimore | Baltimore population stats |
| 21206 | Baltimore | Baltimore | Baltimore population stats |
| 21209 | Baltimore | Baltimore | Baltimore population stats |
| 21210 | Baltimore | Baltimore | Baltimore population stats |
| 21211 | Baltimore | Baltimore | Baltimore population stats |
| 21212 | Baltimore | Baltimore | Baltimore population stats |
| 21213 | Baltimore | Baltimore | Baltimore population stats |
| 21214 | Baltimore | Baltimore | Baltimore population stats |
| 21215 | Baltimore | Baltimore | Baltimore population stats |
| 21216 | Baltimore | Baltimore | Baltimore population stats |
| 21217 | Baltimore | Baltimore | Baltimore population stats |
| 21218 | Baltimore | Baltimore | Baltimore population stats |
| 21223 | Baltimore | Baltimore | Baltimore population stats |
| 21224 | Baltimore | Baltimore | Baltimore population stats |
| 21229 | Baltimore | Baltimore | Baltimore population stats |
| 21230 | Baltimore | Baltimore | Baltimore population stats |
| 21231 | Baltimore | Baltimore | Baltimore population stats |
| 21233 | Baltimore | Baltimore | Baltimore population stats |
| 21235 | Baltimore | Baltimore | Baltimore population stats |
| 21239 | Baltimore | Baltimore | Baltimore population stats |
| 21240 | Baltimore | Baltimore | Baltimore population stats |
| 21241 | Baltimore | Baltimore | Baltimore population stats |
| 21250 | Baltimore | Baltimore | Baltimore population stats |
| 21251 | Baltimore | Baltimore | Baltimore population stats |
| 21260 | Baltimore | Baltimore | Baltimore population stats |
| 21261 | Baltimore | Baltimore | Baltimore population stats |
| 21263 | Baltimore | Baltimore | Baltimore population stats |
| 21264 | Baltimore | Baltimore | Baltimore population stats |
| 21265 | Baltimore | Baltimore | Baltimore population stats |
| 21268 | Baltimore | Baltimore | Baltimore population stats |
| 21270 | Baltimore | Baltimore | Baltimore population stats |
| 21273 | Baltimore | Baltimore | Baltimore population stats |
| 21274 | Baltimore | Baltimore | Baltimore population stats |
| 21275 | Baltimore | Baltimore | Baltimore population stats |
| 21278 | Baltimore | Baltimore | Baltimore population stats |
| 21279 | Baltimore | Baltimore | Baltimore population stats |
| 21280 | Baltimore | Baltimore | Baltimore population stats |
| 21281 | Baltimore | Baltimore | Baltimore population stats |
| 21282 | Baltimore | Baltimore | Baltimore population stats |
| 21283 | Baltimore | Baltimore | Baltimore population stats |
| 21284 | Baltimore | Baltimore | Baltimore population stats |
| 21285 | Baltimore | Baltimore | Baltimore population stats |
| 21287 | Baltimore | Baltimore | Baltimore population stats |
| 21288 | Baltimore | Baltimore | Baltimore population stats |
| 21289 | Baltimore | Baltimore | Baltimore population stats |
| 21290 | Baltimore | Baltimore | Baltimore population stats |
| 21297 | Baltimore | Baltimore | Baltimore population stats |
| 21298 | Baltimore | Baltimore | Baltimore population stats |