The Northwestern Mutual Life Insurance Company began business at Janesville.

The evidence

• “In 1858 the Northwestern Mutual Life Insurance Company, now at Milwaukee, one of the best known of the large life insurance companies, began business at Janesville. It was incorporated by chapter 129 of Laws of Wisconsin for 1857.”

  1908-brown-rock-county/26-history-of-janesville.md, Vol. 2, PDF p. 42 / book p. 555

  Brown, William Fiske, editor. Rock County, Wisconsin: A New History of Its Cities, Villages, Towns, Citizens and Varied Interests, from the Earliest Times, Up to Date. Chicago: C. F. Cooper & Co., 1908. 2 vols. archive.org/details/rockcountywiscon01brow, archive.org/details/rockcountywiscon02brow.

  Grade A: Found on a page of one of our sources