| History of Frederick County, Maryland, Volume 1 | | | | | | | | | | |
| By Thomas John Chew Williams, Folger McKinsey | | | | | | | | | | |
| p. 219 | | | | | | | | | | |
| | | | | For Comparison Purposes | | | | | |
| Frederick County (incl Carroll pre-1837) | | | | | Accomack County, VA | | | | | |
| Date | Total | White | Slave | Freedmen | | Date | Total | Whites | Slave | Freedmen |
| 1790 | 30,251 | 26,397 | 3,641 | 213 | | 1790 | 13,959 | 8,976 | 4,262 | 721 |
| 1800 | 31,523 | 26,478 | 4,572 | 473 | | 1800 | 15,694 | 9,725 | 4,428 | 1,541 |
| 1810 | 34,437 | 27,983 | 5,671 | 783 | | 1810 | 15,743 | 9,341 | 4,542 | 1,860 |
| 1820 | 40,559 | 32,097 | 6,685 | 1,777 | | 1820 | 15,965 | 9,387 | 4,478 | 2,100 |
| 1830 | 45,789 | 36,703 | 6,370 | 2,716 | | 1830 | 16,134 | 9,236 | 4,487 | 2,411 |
| 1840 | 32,221 | 24,791 | 4,445 | 2,985 | | 1840 | 17,095 | 9,617 | 4,629 | 2,849 |
| 1850 | 40,987 | 33,314 | 3,913 | 3,760 | | 1850 | 19,335 | 9,742 | 4,987 | 4,606 |
| 1860 | 46,879 | 38,669 | 3,243 | 4,967 | | 1860 | 18,526 | 10,601 | 4,507 | 3,418 |
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| 1860 approximated - RHS | | | | | | | | | | |
| Total approx (sum of W+S+F) | | | | | | | | | | |
