The graph below ranks each Maryland County by total residents according to the 2012 census estimates.
Maryland total population by county
| County | Total Population |
| Montgomery |  1,004,476 |
| Prince George's | 881,419 |
| Baltimore | 817,682 |
| City of Baltimore | 622,417 |
| Anne Arundel | 550,175 |
| Howard | 299,356 |
| Harford | 248,540 |
| Frederick | 239,520 |
| Carroll | 167,210 |
| Charles | 150,710 |
| Washington | 149,087 |
| St. Mary's | 108,993 |
| Cecil | 101,684 |
| Wicomico | 100,521 |
| Calvert | 89,694 |
| Allegany | 73,869 |
| Worcester | 51,567 |
| Queen Anne's | 48,542 |
| Talbot | 38,040 |
| Caroline | 32,644 |
| Dorchester | 32,554 |
| Garrett | 29,850 |
| Somerset | 26,206 |
| Kent | 20,112 |