Woodbridge Township is a civil township of Hillsdale County in the U.S. state of Michigan. The township had a population of 1,421 at the 2020 census. Woodbridge Township was organized in 1840 from the southernmost section of the then-larger Fayette Township. Woodbridge Township extended south to the state border with Ohio until Amboy T…Woodbridge Township is a civil township of Hillsdale County in the U.S. state of Michigan. The township had a population of 1,421 at the 2020 census. Woodbridge Township was organized in 1840 from the southernmost section of the then-larger Fayette Township. Woodbridge Township extended south to the state border with Ohio until Amboy Township was created from the southernmost section of Woodbridge Township in 1850.