| Year | Census | Index | Notes |
| 1860 | Film | CD, Book | |
| 1870 | Film | CD | |
| 1870 African-American | CD | ||
| 1880 | CD | ||
| 1890 Veterans | Film | ||
| 1900 | Film* | Partial; see below | |
| 1910 | Film* | Partial: see below | |
| 1920 | Ancestry.com | ||
| 1930 | Ancestry.com |
* 1900 Film includes Ferry, Franklin, Garfield Island, Jeferson, King (part), Lewis (part), Lincoln, Mason, Okanogan, Pacific, Whitman (part), Yakima Counties, Indian Population
* 1910 Film includes King (part), Okanogan, Pacific, San Juan, Skagit (part) Counties
| Skagit | 1885 | Call # folio F897.S5 S57 2001 |
| Skagit | 1887 | Call # folio F897.S5 S572 2001 |
| Skagit | 1889 | Call # folio F897.S5 S573 2001 |
| Skagit | 1892 | Call # folio F897.S5 S574 2001 |