| Database | Source | Contributor |
|---|---|---|
| Cowlitz Co. Census Indexes | Indexes to the following Cowlitz County censuses: 1871, 1883, 1885, 1887 and 1910 (posted on the LCGS website). | Lower Columbia Genealogical Society |
| 1847 Lewis County Territorial Census | 1847 census of Lewis Co., Oregon Territory, including part of present-day Cowlitz Co. Only heads of households are named. | Transcribed by Roger Easton for the Washington State Digital Archives |
| 1849 Lewis County Territorial Census | 1849 (March) Census of Lewis Co., Oregon Territory, including part of present-day Cowlitz Co. Only heads of households are named. | Transcribed by Nancy Prevost for the US GenWeb Archives |
| 1850 Federal Census | 1850 Census of Lewis Co., Washington Territory, including part of present-day Cowlitz Co. This was the first census to enumerate every individual in the county. | Transcribed by Kevin Fraley for the US GenWeb Archives |
| 1850 Federal Census | 1850 Census of Clark Co., Washington Territory, including part of present-day Cowlitz Co. This was the first census to enumerate every individual in the county. | Transcribed by Kevin Fraley for the US GenWeb Archives |
| 1851 Lewis County Territorial Census | 1851 census of Lewis Co., Washington Territory, including part of present-day Cowlitz Co. 200 individuals were enumerated in this census. The census is searchable from the home page. | Transcribed by Roger Easton for the Washington State Digital Archives |
| 1860 Federal Census | 1860 Federal Census of Cowlitz Co., Washington Territory (This is the complete census, which names of every resident counted.) Every entry is linked to an image of the actual census page. |
Transcribed for the Washington State Digital Archives |
| 1860 Federal Census | 1860 Census of Cowlitz Co., Washington Territory | Transcribed by Kevin Fraley for the US GenWeb Archives |
| 1860 Federal Census - Annotated | A companion to the 1860 Census - this page will allow researchers to add comments, email addresses and URLs for individuals listed in the census. | Jenny Tenlen |
| 1860 Mortality Census | Complete transcription of the 1860 Mortality Census of Cowlitz Co., Washington Territory, which lists all person who died in the 1860 census year, beginning June 1, 1859 and ending May 31, 1860. Posted on the USGenWeb Census Project website. | April Phillips |
| 1870 Federal Census | Complete transcription of the 1870 Cowlitz Co., Washington Territory census, with comments and annotation provided by Cowlitz Co. researchers. | Transcribed by Jenny Tenlen |
| 1870 Federal Census | 1870 Federal Census of Cowlitz Co., Washington Territory. Searchable from the home page. Every entry is linked to an image of the actual census page. | Transcribed for the Washington State Digital Archives |
| 1870 Mortality Census | Complete transcription of the 1870 Mortality Census of Cowlitz Co., Washington Territory, which lists all person who died in the 1870 census year, beginning June 1, 1869 and ending May 31, 1870. Posted on the USGenWeb Census Project website. | April Phillips |
| 1871 Cowlitz County Territorial Census | 1871 census of Cowlitz Co., Washington Territory. The census is searchable from the home page. | Transcribed for the Washington State Digital Archives |
| 1880 Federal Census | Complete transcription of the 1880 Census of Cowlitz Co., Washington Territory. | Linda Henson (Mullins) |
| 1880 Mortality Census | Complete transcription of the 1880 Mortality Census of Cowlitz Co., Washington Territory, which lists all person who died in the 1880 census year, beginning June 1, 1879 and ending May 31, 1880. Posted on the USGenWeb Census Project website. | April Phillips |
| 1883 Cowlitz County Territorial Census | 1883 census of Cowlitz Co., Washington Territory. The census is searchable from the home page. | Transcribed for the Washington State Digital Archives |
| 1885 Cowlitz County Territorial Census | 1885 census of Cowlitz Co., Washington Territory. The census is searchable from the home page. | Transcribed for the Washington State Digital Archives |
| 1887 Cowlitz County Territorial Census | 1887 census of Cowlitz Co., Washington Territory. The census is searchable from the home page. | Transcribed for the Washington State Digital Archives |
| 1890 Special Census - Union Veterans and Widows | Complete transcription of the Special Schedule of the 1890 Federal Census, listing all Union veterans and widows of veterans of the Civil War. | Transcribed by Jenny Tenlen |
| 1910 Federal Census | 1910 census of Cowlitz Co., Washington. The census is searchable and from the home page; names are linked to images of the actual census page. | Transcribed by the Washington State Genealogical Society for the Washington State Digital Archives |
| 1910 Federal Census | Partial transcription the 1910 Cowlitz Co., WA Census. Several precincts are online, and researchers are encouraged to help annotate the census data. | Transcribed by Jenny Tenlen |
| 1920 Federal Census | Part of an ongoing project to transcribe the 1920 Cowlitz Co., WA Census. Several precincts are online, and researchers are encouraged to help transcribe or annotate the census data. | Transcribed by Jenny Tenlen |
| 1930 Federal Census | Part of an ongoing project to transcribe the 1930 Cowlitz Co., WA Census. Several precincts are online, and researchers are encouraged to help transcribe or annotate the census data. | Transcribed by Jenny Tenlen |
| 1940 Federal Census | Digital images of the 1940 Federal Census were released in April 2012 by the National Archives. | Indexed by Jenny Tenlen |