Located in the southwestern corner of the county, it borders the following townships:
- Hartsgrove Township - north
- Rome Township - northeast corner
- Orwell Township - east
- Bloomfield Township, Trumbull County - southeast corner
- Mesopotamia Township, Trumbull County - south
- Middlefield Township, Geauga County - southwest corner
- Huntsburg Township, Geauga County - west
- Montville Township, Geauga County - northwest corner
No municipalities are located in Windsor Township, although the unincorporated community of Windsor lies in the township's east.
- US Board on Geographic Names". United States Geological Survey. 2007-10-25. Retrieved 2008-01-31.
- American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- Geographic Identifiers: 2010 Demographic Profile Data (G001): Windsor township, Ashtabula County, Ohio". U.S. Census Bureau, American Factfinder. Retrieved July 9, 2013.
- Ashtabula County, Ohio Ashtabula County, 2007. Accessed 2007-05-28.
- §503.24, §505.01, and §507.01 of the Ohio Revised Code. Accessed 4/30/2009.
The township is governed by a three-member board of trustees, who are elected in November of odd-numbered years to a four-year term beginning on the following January 1st. Two are elected in the year after the presidential election and one is elected in the year before it. There is also an elected township fiscal officer, who serves a four-year term beginning on April 1st of the year after the election, which is held in November of the year before the presidential election. Vacancies in the fiscal officership or on the board of trustees are filled by the remaining trustees. Currently, the board is composed of Chairman Jim Plizga and members Jeffrey Merritt and Robert Slusher.
Name and history
Statewide, other Windsor Townships are located in Lawrence and Morgan counties.
The earliest settler in Windsor Township was George Phelps, who came to the area from Connecticut in 1799.