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The Friends of Jonathan Clark House is a 501(c)3 nonprofit organization. Donations are tax-deductible to the extent allowed by law.
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Set high on the corner of Bonniwell and Cedarburg Roads in Mequon, the extraordinary beauty of the Jonathan Clark House is immediately apparent to all who pass. Surrounded by two and one-half acres of scenic woodland, the house is one of the most architecturally significant historic buildings in southeastern Wisconsin and is a key part of Mequon and Thiensville’s rich history. The beautiful Greek Revival home was built by Clark in 1848, the year of Wisconsin’s statehood, and is on the National Register of Historic Places. Clark was a prominent early Yankee settler and one of the area’s first road supervisors. Also a leader in the development of Mequon’s first public school district, he worked with his father-in-law Peter Turck and their friend William Bonniwell to develop the Bonniwell school.

For more Clark House history, be sure to visit our Clark House Historian blog.

Click on the following links for additional Historic information:  

Photo of Mary Turck Clark

Photo of Mary Turck Clark

and The Mequon – Thiensville Historical Society:


Photo of Jonathan Clark.

Photo of Jonathan Clark.


Jerry McGinnis, founder of Embassy Homes in Mequon, facilitated the purchase of the property. He bought it from Dr.Gregory and Jean Custer in 2012. While waiting to receive 501.c3 status from the State of Wisconsin, the Friends of Jonathan Clark House, LTD. Board of Directors entered into a partnership with the Mequon Community Foundation. The Foundation provided valuable guidance and fundraising expertise to the Board.
McGinnis jump started the Friends organization by donating $25,000. A generous donation of $25,000 from Sommer’s Automotive of Mequon also provided energy for this project. Additionally, the George and Virgilee (retired Steffen Middle School teacher) Krueck Estate donated $25,000. The Frederick and David Bock Families donation of $30,000 toward the development of important handicap accessible features was a significant and welcome local family commitment.
The Friends are repaying the McGinnis loan through the fundraising efforts of the “Bringing History to Life at the Jonathan Clark House Museum” capital campaign. Family and Single memberships in the Friends of Jonathan Clark House help to sustain the operating expenses of the museum while bringing members of the community together in this historic project.

The first priority of the Friends organization is to raise the funds needed to purchase this precious landmark so that it can be made available for the education and enjoyment of the entire community. The second priority is the development of the handicap accessible entrance and rest room.

Community support is greatly needed!  Read more about how you can help preserve this piece of heritage on our Donate page.

Our Mission:

To collect, preserve and share the history of the Jonathan Clark House and the early settlers of Thiensville-Mequon.

Our  Vision: The Jonathan Clark House Museum will be a self-sustaining, well-integrated community resource.


Learn about the background and history
of the Jonathan Clark House. Schedule a guided tour!

Read more about the history
of the Jonathan Clark House.

Become a Friends of JCH Member!

Individual and Family Membership Drive going on now! 2017 Renewal or join today!

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Haven't had a tour? The museum is available for individual and small group tours. Contact Museum Director Look at

Family-friendly events this summer: JUNE 4, 17, & 20 and JULY 19 & 29

"Bringing History to Life Campaign" is in full swing!!

Click below to donate & support this effort

Click here to see more details.