| Year | Census | Index |
| 1790 | Film | CD, Book |
| 1800 | Film | CD, Book |
| 1810 | Film | CD, Book |
| 1820 | Film | Book |
| 1830 | Film | Book |
| 1840 | Film | Book |
| 1850 | Film | |
| 1850 Slave | Film | |
| 1860 | Film* | CD; Film partial; see below |
| 1860 Slave | Film | |
| 1870 | Film | CD, free online |
| 1870 African-American | CD | |
| 1880 | CD, free online | |
| 1890 Veterans | Film | Book |
| 1920 | Ancestry.com | |
| 1930 | Ancestry.com | |
| 1930 | Street index for Baltimore on microfilm |
* 1860 Film includes Washington County
| Allegany | 1800 | folio F187.A4 C8 1971 |
| Frederick | 1850 | F187.F8 H62 |
| Saint Mary's | 1800 | |
| Somerset | 1850 | folio F187.S7 D79 |
| Somerset | 1800 | |
| Talbot | 1800 | |
| Washington | 1800 | |
| Worchester | 1800 |
| State | 1776 | |
| State | 1776 | index free online |
| State | 1778 | index free online |
| Swedes on the Delaware | 1693 | F157.D4 C73 1993 |