OCONTO COUNTY, WI HISTORY AND LOOKUP

County History Books

Commemorative Biographical Record of the West Shore of Green Bay, Wisconsin Including the Counties of Brown, Oconto, Marinette and Florence by J.H. Beers & Co, (1896) – 804 Pages
Source: Internet Archive
Book ID: CH.2025.08.21.2047.AR

Oconto County, Wisconsin: A Genealogical Overview

Located on the western shore of Green Bay in northeastern Wisconsin, Oconto County is a land whose history was written in its vast pine forests. Once an immense territory at the heart of Wisconsin’s 19th-century lumber boom, its story is one of Native American heritage, French traders, powerful lumber barons, and the resilient European immigrants who cleared the cutover land to build the farms and communities that exist today. For genealogists, researching Oconto County requires an understanding of its ever-changing boundaries and its pivotal role in the development of the entire region.

I. County Formation and Evolution

Oconto County’s most significant genealogical challenge lies in its formation history; it was once a massive county from which several others were created. Tracing ancestors often means following the changing county lines.

  • 1851: County Formed: Oconto County was established on February 6, 1851.
  • Parent County: It was created entirely from the northern portion of Brown County. All research for individuals in the area prior to 1851 must be conducted in the records of Brown County.
  • Subsequent Formations: Oconto County was originally a vast “super-county” covering much of northeastern Wisconsin. Its territory was significantly reduced over time with the creation of new counties. Depending on the year, records for ancestors in the following counties may be found in Oconto County:
    • Shawano County (created in part from Oconto in 1853)
    • Marinette County (created entirely from Oconto in 1879, splitting the county roughly in half)
    • Forest County (created in part from Oconto in 1885)
  • Name Origin: The county is named for the Oconto River. The name is believed to derive from a Menominee Indian term, “Okon-tow,” meaning “place of the pickerel” or referring to a river landing.
  • County Seat History: The city of Oconto was designated as the county seat upon its organization and has remained so.

II. Settlement and Early History

  • Early Inhabitants: The region was the ancestral homeland of the Menominee people. The area was also frequented by the Ho-Chunk, Ojibwe, and Potawatomi. The first Europeans to arrive were French fur traders and Jesuit missionaries in the 17th century.
  • The Lumber Boom: From the 1850s to the early 1900s, Oconto County was a national center for the logging industry. Its immense forests of old-growth white pine were harvested to build the growing cities of the Midwest. Powerful lumber companies established huge sawmills in Oconto, Peshtigo, and Marinette (the latter two were then part of Oconto County), turning the region into a bustling hub of industry.
  • The Peshtigo Fire of 1871: On October 8, 1871, the deadliest wildfire in American history, the Peshtigo Fire, swept through a massive portion of northeastern Wisconsin, including much of what was then Oconto County. The firestorm destroyed numerous settlements and claimed an estimated 1,500 to 2,500 lives. This event is a pivotal and tragic part of the county’s history, profoundly impacting its population and records.
  • Immigration and Agriculture: As the pine forests were logged, land companies promoted the fertile “cutover” lands to new settlers. This brought a wave of immigrants, particularly from Germany, Poland, Belgium, Sweden, and Norway, who established the dairy farms and agricultural communities that would become the county’s new economic foundation.

III. Genealogical Records and Resources

Records are centralized at the county seat in Oconto, but researchers must also consider the area research center and the historical society.

  • County Courthouse: The Oconto County Courthouse, 301 Washington St., Oconto, WI 54153, is the central repository for county-level records.
    • Register of Deeds: In Wisconsin, this office holds the key genealogical records, including all vital records (birth, death, and marriage) and all land records (deeds, mortgages).
    • Clerk of Circuit Court: This office maintains judicial records, including probate files (wills and estates), naturalization records prior to 1906, civil and criminal case files, and divorce records.
  • Vital Records:
    • Birth, Death, and Marriage Records: Statewide registration in Wisconsin began in 1907. The Oconto County Register of Deeds holds the county’s vital records, with registrations beginning around 1851, although records from the earliest years can be sparse.
  • Libraries and Societies:
    • Oconto County Historical Society: Located in Oconto, this is an essential resource for researchers. It operates several historic sites and maintains an archive with photographs, family histories, and subject files.
    • Farnsworth Public Library: The main library in Oconto has a local history collection that includes newspapers on microfilm, plat maps, and local directories.
    • University of Wisconsin-Green Bay, Archives and Area Research Center: This is a major research hub for the region. As part of the Wisconsin Historical Society’s network, it holds microfilm copies of many Oconto County courthouse records, naturalization papers, newspapers, and extensive manuscript collections.
  • Bordering Jurisdictions:
    • Marinette County (north)
    • Shawano County (west)
    • Menominee County (west)
    • Langlade County (northwest)
    • Brown County (south)

Please share any resources you have and will do lookups or links to resources you are aware of. Thanks