How to use this list
Counties are sorted alphabetically. Use ZIP count and population to spot larger counties, then open a county for its ZIP roster and income/housing averages.
Maryland counties
24 counties · 477 ZIP codes · population 6,170,363 . Select a county to open its ZIP table and local summary.
Related pages
Also see the Maryland overview, cities, rankings, and congressional districts.
| County | ZIP codes | Population | Avg. income |
|---|---|---|---|
| Allegany County | 13 | 63,366 | $56,862 |
| Anne Arundel County | 37 | 605,271 | $131,895 |
| Baltimore city | 23 | 565,958 | $66,197 |
| Baltimore County | 44 | 850,628 | $115,569 |
| Calvert County | 12 | 90,942 | $139,766 |
| Caroline County | 8 | 32,666 | $68,739 |
| Carroll County | 9 | 157,920 | $110,590 |
| Cecil County | 15 | 104,366 | $91,980 |
| Charles County | 22 | 168,624 | $128,798 |
| Dorchester County | 16 | 31,123 | $69,274 |
| Frederick County | 28 | 296,879 | $131,769 |
| Garrett County | 11 | 33,109 | $65,310 |
| Harford County | 20 | 261,316 | $112,182 |
| Howard County | 20 | 333,217 | $175,362 |
| Kent County | 9 | 24,053 | $77,014 |
| Montgomery County | 48 | 1,068,171 | $151,216 |
| Prince George's County | 36 | 947,386 | $104,837 |
| Queen Anne's County | 12 | 48,439 | $101,849 |
| Somerset County | 9 | 23,249 | $66,193 |
| St. Mary's County | 26 | 112,761 | $122,516 |
| Talbot County | 15 | 37,285 | $99,801 |
| Washington County | 18 | 154,802 | $80,002 |
| Wicomico County | 16 | 105,474 | $82,163 |
| Worcester County | 10 | 53,358 | $91,905 |
Frequently asked questions
- How many counties are listed for Maryland?
- US5 currently lists 24 counties with published ZIP coverage in Maryland. Counts can change as geography publishes update.
- What happens when I open a county?
- Each county page shows ZIP totals, income and housing averages, and a ZIP table. From there you can open any ZIP for a full demographics dashboard.