Twin Township has been in existence since 1805.  It is located in the south-central part of Ross County.  U.S. highway route 50 runs through the heart of the township. 

The unincorporated Village of Bourneville is situated in the center of the township, where the township Fire House and Garage are located.

Population of the township is approximately 3,200, and is 60 square miles in size. The township maintains about 41 miles of township roads, of which all but about 3 miles are paved. There is one active cemetery in the township and several smaller, inactive ones.

The Twin Township Trustees meet on the second Monday of the month beginning at 7:00 p.m. at the Bourneville Fire House.  Special meetings may be called during the year.