The graph below ranks each Maryland County by total residents according to the 2006 census estimates.
Maryland total population by county
| County | Total Population |
| Montgomery |  932,131 |
| Prince George's | 841,315 |
| Baltimore | 787,384 |
| Baltimore city | 631,366 |
| Anne Arundel | 509,300 |
| Howard | 272,452 |
| Harford | 241,402 |
| Frederick | 222,938 |
| Carroll | 170,260 |
| Washington | 143,748 |
| Charles | 140,416 |
| Cecil | 99,506 |
| St. Mary's | 98,854 |
| Wicomico | 91,987 |
| Calvert | 88,804 |
| Allegany | 72,831 |
| Worcester | 48,866 |
| Queen Anne's | 46,241 |
| Talbot | 36,062 |
| Caroline | 32,617 |
| Dorchester | 31,631 |
| Garrett | 29,859 |
| Somerset | 25,774 |
| Kent | 19,983 |