[2] In 2000, according to the United States Census Bureau, the township had a total area of 113.25 sq mi (293.32 km2), all land.

It has expanded since that time: on January 1, 2004, the adjacent East Fork Road District, located east of Wharton Township, was annexed to Wharton Township.

The racial makeup of the township was 95.60% white, 1.10% Native American, and 3.30% from two or more races.

26.8% of all households were made up of individuals, and 19.5% had someone living alone who was 65 years of age or older.

There were 11.4% of families and 9.2% of the population living below the poverty line, including 13.8% of under eighteens and 15.4% of those over 64.