[10] The township's name sake is the American Indian Chief Wasso.

[11] A post office was established at Big Rapids on November 4, 1838, with the name Owasso with postmaster Daniel Ball.

On the following day, Caledonia was detached short 5 section from the full township survey area.

On February 16, 1842, the missing section were transferred to Caledonia to make it a whole survey area.

[11] Before January 22, 1864, the Detroit and Milwaukee Railroad came through the township's west side and a station, Mungerville, opened there.

On that date, a post office opened there with the same name under postmaster Philander Munger.

[5] The Owasso post office officially changed to the newer spelling on June 8, 1875.

22.9% of all households were made up of individuals, and 11.9% had someone living alone who was 65 years of age or older.