1836
Norwegians settled in Rock County, forming early a nucleus in Luther Valley in the town of Newark.
Rock CountyGrade A · 1 independent source
The evidence
“Some of the early pioneers of Rock county were Norwegians, many of whom have resided here since 1836. A nucleus was early formed in the town of Newark, near where the town corners with the towns of Plymouth, Avon and Spring Valley, in a beautiful valley, christened by the early Norwegian settlers, Luther Valley.”
1856-history-of-rock-county/05-avon.md, PDF p. 62 / book p. 44
Guernsey, Orrin, and Josiah F. Willard, editors. History of Rock County, and Transactions of the Rock County Agricultural Society and Mechanics' Institute. Janesville, Wis.: William M. Doty & Brother, 1856. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871593.
Grade A: Found on a page of one of our sources