Jacob Mixsell House, also known as the Northampton County Historical and Genealogical Society, is a historic home located at Easton, Northampton County, Pennsylvania. It was built in 1833, and is a 2 1/2 story brick building in the Late Federal style. A rear addition was built about 1850. The interior features five fireplaces with marble mantles believed to be from King of Prussia, Pennsylvania. It has housed the Northampton County Historical and Genealogical Society since 1927.
More information on the Wikipedia page 
The Society's website is .