The Rock County Historical Society is a resource for historical research, thought-provoking programming, and one-of-a-kind historic sites. At its center is the Lincoln-Tallman House, an Italianate-style mansion that was constructed in 1857 and occupied by William Morrison Tallman, a lawyer and abolitionist. Abraham Lincoln visited in October of 1859 prior to his election in 1860. A variety of themed tours of the Lincoln-Tallman House are available. The Traditional Tour narrative will focus on how a prosperous Victorian family would have lived, weaving in stories about the Tallman family. In November and December, come for the Lincoln-Tallman House Holiday Tour with the house decked out in its holiday finery.

The Helen Jeffris Wood Museum Center, housed in the 1912 Prairie-style residence of Stanley Dexter Tallman, serves as the Lincoln-Tallman House's visitor and ticketing center and houses the administrative offices of the Rock County Historical Society. The Helen Jeffris Wood Museum Center offers exhibit galleries that feature Pauline Pottery and Pickard China, as well as rotating exhibits celebrating the history and heritage of Rock County. Parker Pen World features some of the most popular Parker pens in history, a collection of old ads and memorabilia, and music from the Parker Pen Band. The Rock County Legacies Exhibit features stories and artifacts from the Janesville General Motors plant. It includes employees’ stories, a large collage of photographs, and more than 100 artifacts dating from 1900 – 2005.  A highlight of the display is the 100 millionth vehicle built by General Motors in the U.S., a 1967 Chevrolet Caprice Custom Coupe built at the Chevrolet-Fisher Body Assembly Plant in Janesville. The vehicle is on loan to RCHS from the Sloan Longway Museum in Flint, Michigan.  Visit the gift shop, which features art pieces from Janesville Art League members and other regional artists and makers selling on consignment. Visitors will also discover pottery, children's items, unique upcycled mittens, scarves and other attire, an assortment of locally made masks, and a wide selection of jewelry including costume pieces, fine jewelry, and collectibles. The gift shop is open by appointment.

Next door, the Charles Tallman Archives & Research Center contains historical documents, photographs, and other resources for genealogy and historical research and inquiry.