| Exclusively Republican (6) | Allegany, Caroline, Carroll, Cecil, Garrett, Harford |
| Exclusively Democratic (4) | Baltimore City, Charles, Montgomery, Prince George’s |
| Heavily Republican (8) | Anne Arundel, Calvert, Frederick, Queen Anne’s, Saint Mary’s, Talbot, Washington, Worcester |
| Heavily Democratic (3) | Baltimore County, Dorchester, Howard |
| Evenly Divided (3) | Kent, Somerset, Wicomico |