FIPS
Code | State | County name | 2003 urban
influence code | Description | 2000 population |
|---|
| 24001 | MD | Allegany County | 2 | Small-in a metro area with fewer than 1 million residents | 74,930 |
| 24003 | MD | Anne Arundel County | 1 | Large-in a metro area with at least 1 million residents or more | 489,656 |
| 24005 | MD | Baltimore County | 1 | Large-in a metro area with at least 1 million residents or more | 754,292 |
| 24009 | MD | Calvert County | 1 | Large-in a metro area with at least 1 million residents or more | 74,563 |
| 24011 | MD | Caroline County | 4 | Noncore adjacent to a large metro area | 29,772 |
| 24013 | MD | Carroll County | 1 | Large-in a metro area with at least 1 million residents or more | 150,897 |
| 24015 | MD | Cecil County | 1 | Large-in a metro area with at least 1 million residents or more | 85,951 |
| 24017 | MD | Charles County | 1 | Large-in a metro area with at least 1 million residents or more | 120,546 |
| 24019 | MD | Dorchester County | 5 | Micropolitan adjacent to a small metro area | 30,674 |
| 24021 | MD | Frederick County | 1 | Large-in a metro area with at least 1 million residents or more | 195,277 |
| 24023 | MD | Garrett County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 29,846 |
| 24025 | MD | Harford County | 1 | Large-in a metro area with at least 1 million residents or more | 218,590 |
| 24027 | MD | Howard County | 1 | Large-in a metro area with at least 1 million residents or more | 247,842 |
| 24029 | MD | Kent County | 4 | Noncore adjacent to a large metro area | 19,197 |
| 24031 | MD | Montgomery County | 1 | Large-in a metro area with at least 1 million residents or more | 873,341 |
| 24033 | MD | Prince George's County | 1 | Large-in a metro area with at least 1 million residents or more | 801,515 |
| 24035 | MD | Queen Anne's County | 1 | Large-in a metro area with at least 1 million residents or more | 40,563 |
| 24037 | MD | St. Mary's County | 3 | Micropolitan adjacent to a large metro area | 86,211 |
| 24039 | MD | Somerset County | 2 | Small-in a metro area with fewer than 1 million residents | 24,747 |
| 24041 | MD | Talbot County | 3 | Micropolitan adjacent to a large metro area | 33,812 |
| 24043 | MD | Washington County | 2 | Small-in a metro area with fewer than 1 million residents | 131,923 |
| 24045 | MD | Wicomico County | 2 | Small-in a metro area with fewer than 1 million residents | 84,644 |
| 24047 | MD | Worcester County | 5 | Micropolitan adjacent to a small metro area | 46,543 |
| 24510 | MD | Baltimore city | 1 | Large-in a metro area with at least 1 million residents or more | 651,154 |
