Compiled from "The History of Highland County" By Oren F. Morton, 1922.
| Census Year | Pendleton | Bath | Highland |
| 1790 | 2452 | / | / |
| 1800 | 3962 | 5508 | / |
| 1810 | 4238 | 4837 | / |
| 1820 | 4846 | 5231 | / |
| 1830 | 6271 | 4002 | / |
| 1840 | 6940 | 4300 | / |
| 1850 | 5795 | 3426 | 4227 |
| 1860 | 6164 | 3676 | 4319 |
| 1870 | 6455 | 3975 | 4151 |
| 1880 | 8022 | 4482 | 5164 |
| 1890 | 8711 | 4587 | 5352 |
| 1900 | 9167 | 5598 | 5647 |
| 1910 | 9349 | 6538 | 5317 |
In 1850, Highland County had 651 families with an average 6.5 persons per family.