Cowlitz County Genealogy Records

Cowlitz County genealogy records date back to 1854 when the county was carved out of Lewis County, and researchers can find birth, death, marriage, land, probate, and naturalization records through the County Auditor, the Superior Court Clerk, and the Washington State Southwest Regional Archives. Whether you are tracing family history in Kelso, Longview, or the rural communities along the Cowlitz River, this guide covers the main sources and how to access them. The Lower Columbia Genealogical Society in Longview also holds a strong local collection that supports ancestry research across the region.

Cowlitz County Auditor Records

The Cowlitz County Auditor's Office holds key genealogy records and provides access to most recorded documents online through the Auditor's Public Record Search. Marriage records start from 1867, death records run from 1891 to 1907, and land records go back to 1854. These records cover vital events in the county's early settlement years and beyond. Birth records from 1891 to 1940 are also part of the auditor's collection.

The auditor's office notes that genealogy research is one of the most common reasons people use their records. You can search online through the county portal or visit in person at the Cowlitz County Administration Building. Documents are also uploaded to the Washington State Digital Archives, where you can search, view, and order copies using a credit or debit card. Not every record has been transferred to the digital archives yet, so in-person visits may still turn up items not found online.

The Cowlitz County Auditor Birth Records 1891-1940 collection at the Digital Archives includes both an index and images of birth returns filed with the auditor. When searching, use the parents' names rather than the child's name for best results. The mother's last name will appear under her maiden name.

The Washington State Digital Archives hosts the Cowlitz County Auditor's early recorded documents, including land and vital records that researchers frequently use for ancestry work.

These records provide direct access to Cowlitz County's oldest recorded history and are valuable for tracing families back to the county's founding era.

Cowlitz County Genealogy at the Digital Archives

The Washington State Digital Archives holds several Cowlitz County collections that you can search from home. Birth records from 1891 to 1940 are indexed with images. Marriage records from 1986 to 2022 are available. Recorded land records, plats and surveys, and recorded agreements and contracts are also included. These span a wide range of dates and record types, making the Digital Archives a strong first stop for Cowlitz County family history research.

The Cowlitz County Auditor recorded agreements and contracts collection includes documents recorded with the auditor's office and can be useful for tracking family property transactions and legal relationships.

Browsing the Digital Archives by county allows you to see all Cowlitz collections at once, which can reveal record types you might not have thought to search.

Kalama City Clerk burial transit permits from 1941 to 1943 are also available through the Digital Archives. Historical school district registers and censuses covering various dates round out the Cowlitz County holdings there. These supplementary records can help fill in gaps when vital records are missing.

Washington State Southwest Regional Archives

The Southwest Regional Branch of the Washington State Archives serves Cowlitz County and holds records transferred from county offices over the years. This includes genealogy-focused holdings such as birth and death records from the early registration period, marriage records, naturalization records, and probate files. Researchers who can visit in person will find original records and finding aids to guide their search.

You can contact the branch by email at swbrancharchives@sos.wa.gov or by phone at 360-753-1684. In-person visits should be arranged in advance. The Southwest Branch is part of the broader Washington State Archives system managed through the Secretary of State's office. Check the sos.wa.gov archives page for current hours and appointment procedures before you travel.

Additional Cowlitz County auditor records at the Digital Archives complement what the physical branch holds on-site, giving researchers both remote and in-person options.

Staff at the Southwest Branch can help you determine which collections exist and whether records have been transferred to the archives or remain with the originating county office.

Note: Not all Cowlitz County records have been transferred to the state archives. Some historical files still sit with the auditor or clerk in Kelso.

Cowlitz County Clerk and Court Records

The Cowlitz County Superior Court Clerk holds divorce, probate, and court records from 1874, as well as naturalization and adoption records from 1869. These are among the oldest surviving records in the county and can be valuable for genealogy. Probate files in particular often include detailed lists of heirs, property, and family relationships that you won't find in vital records alone.

Naturalization records from 1869 onward document the process by which immigrants became U.S. citizens in Cowlitz County. These records can show a person's country of origin, date of arrival, and the names of witnesses who vouched for them. This makes them useful not just for the immigrant but also for tracing their family connections in the new country and the old one.

For death certificates and birth certificates linked to current events, the Cowlitz County Health and Human Services department provides vital records services and application forms. Marriage licenses in Cowlitz County are issued through the Auditor's Office. Divorce decrees are obtained through the Superior Court Clerk's Office in Kelso.

Lower Columbia Genealogical Society

The Lower Columbia Genealogical Society was established in 1963 and partnered with the Longview Public Library in 1980 to build a genealogy collection. The Genealogy Room at the Longview Public Library holds materials that cover Cowlitz County and neighboring Wahkiakum County. It is one of the most complete local genealogy rooms in Southwest Washington.

The society's holdings include birth certificate abstracts, census transcriptions, Cowlitz County cemetery transcripts, marriage records, military histories, naturalization records, newspapers, obituaries, probate court records, and wills. For Wahkiakum County, the collection includes census data from 1854 to 1892, clerk and auditor records from 1868 to 1980, commissioner's minutes from 1854 to 1893, and telephone directories. These are not available online and must be accessed through the library in person.

Searchable databases tied to the society include the 1871, 1883, 1885, and 1887 census transcriptions and indexes, cemetery inscriptions, Cowlitz County early wills index from 1865 to 1919, Cowlitz County marriages from 1854 to 1925, naturalizations from 1859 to 1920, and probate court records from 1861 to 1907. Publications for sale from the society include the 1910 Federal Census for Cowlitz County, cemetery transcripts, marriages from 1854 to 1900, delayed birth certificates issued in 1942 and 1943, and naturalizations from 1859 to 1920. The society website can be found through RootsWeb's Lower Columbia Genealogical Society page.

Note: The society's collection at the Longview Public Library is open to all researchers, not just society members.

Cowlitz County Ancestry Research on FamilySearch

FamilySearch offers free access to a range of Cowlitz County historical records. The FamilySearch Wiki for Cowlitz County, Washington lists online resources, known record start dates, and guidance for finding local collections. It is a practical starting point if you are new to Cowlitz County research.

Key known record start dates for Cowlitz County are: births from 1891, marriages from 1867, deaths from 1891, court records from 1874, land records from 1854, and probate from 1874. There is no known history of courthouse disasters in the county, which means early records have a good chance of surviving intact. Cowlitz County was created on April 21, 1854, from Lewis County, so for events before that date you would look at Lewis County records.

Cities in Cowlitz County

Cowlitz County has several communities. Longview is the largest city and is home to the Lower Columbia Genealogical Society's research room at the public library. All genealogy records for the county are maintained at the county offices in Kelso.

Other communities in Cowlitz County include Castle Rock, Kalama, Woodland, Rainier, and Vader. Records for events in all of these communities are filed with the Cowlitz County Auditor and Superior Court Clerk in Kelso.

Nearby Counties

These counties border Cowlitz County. If your ancestors lived near a county line, check records in neighboring counties as well, since family activity often crossed boundaries.