| County | FIPS |
|---|---|
| Allegany County | 24001 |
| Anne Arundel County | 24003 |
| Baltimore city | 24510 |
| Baltimore County | 24005 |
| Calvert County | 24009 |
| Caroline County | 24011 |
| Carroll County | 24013 |
| Cecil County | 24015 |
| Charles County | 24017 |
| Dorchester County | 24019 |
| Frederick County | 24021 |
| Garrett County | 24023 |
| Harford County | 24025 |
| Howard County | 24027 |
| Kent County | 24029 |
| Montgomery County | 24031 |
| Prince George | 24033 |
| Queen Anne | 24035 |
| Somerset County | 24039 |
| St. Mary | 24037 |
| Talbot County | 24041 |
| Washington County | 24043 |
| Wicomico County | 24045 |
| Worcester County | 24047 |