The Town of Champion is in the southern part of the county and is east of Watertown.
The town was established in 1800 from part of the Town of Mexico (Now in Oswego County) before the county was created. It was named after Henry Champion, who in return for his gratitude, commissioned a bell for the town church. In 1803, part of the town was used to establish part of the Town of Harrisburg (now in Lewis County). Early settlers hoped the town would become the locale for the county seat, but were disappointed.
The community of West Carthage set itself apart from the town in 1889 by incorporating as a village.
The Black River flows along the town's east boundary. The southeast town line is the border of Lewis County.
New York State Route 126 is a major east-west highway. Another east-west highway in the northern part of Champion intersects north-south highway New York State Route 26 at Great Bend.
There were 1,675 households out of which 36.5% had children under the age of 18 living with them, 59.0% were married couples living together, 8.6% had a female householder with no husband present, and 28.9% were non-families. 23.9% of all households were made up of individuals and 11.6% had someone living alone who was 65 years of age or older. The average household size was 2.60 and the average family size was 3.06.
In the town the population was spread out with 27.8% under the age of 18, 8.8% from 18 to 24, 30.2% from 25 to 44, 21.1% from 45 to 64, and 12.2% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 93.1 males. For every 100 females age 18 and over, there were 93.8 males.
The median income for a household in the town was $34,875, and the median income for a family was $41,415. Males had a median income of $35,093 versus $21,386 for females. The per capita income for the town was $15,951. About 7.6% of families and 10.5% of the population were below the poverty line, including 12.0% of those under age 18 and 8.2% of those age 65 or over.