Martinsville is a city in and the county seat of Morgan County, Indiana, United States; the population was 11,828 at the 2010 census. The Morgan County courthouse, completed in 1859, still shines in its red brick and Italianate design. This is one of very few pre Civil-War courthouses existing in Indiana. Built by Perry Magnus Blankenship. Architect Isaac Hodgson designed the courthouse. Mr. Hodgson designed six Indiana courthouses including Jennings County (1859), Morgan County (1857), Henry County, Bartholomew County (1871), and his largest in Marion County, in Indianapolis.