Communities in the township include Rowes Run, Republic, Allison, Chestnut Ridge, Fairbank, Cardale, Royal, Merrittstown, Herbert, and a small portion of Grindstone.
According to the United States Census Bureau, Redstone Township has a total area of 22.8 square miles (59.1 km2), of which 22.76 square miles (58.95 km2) is land and 0.062 square miles (0.16 km2), or 0.27%, is water.[3]
As of the 2000 census,[9] there were 6,397 people, 2,651 households, and 1,757 families residing in the township. The population density was 283.1 inhabitants per square mile (109.3/km2). There were 2,943 housing units at an average density of 130.2 per square mile (50.3/km2) The racial makeup of the township was 90.21% White, 8.05% African American, 0.11% Native American, 0.11% Asian, 0.05% Pacific Islander, 0.30% from other races, and 1.17% from two or more races. Hispanic or Latino of any race were 0.30% of the population.
There were 2,651 households, out of which 27.1% had children under the age of 18 living with them, 47.0% were married couples living together, 14.7% had a female householder with no husband present, and 33.7% were non-families. 30.4% of all households were made up of individuals, and 16.7% had someone living alone who was 65 years of age or older. The average household size was 2.40 and the average family size was 2.99.
In the township the population was spread out, with 22.4% under the age of 18, 7.9% from 18 to 24, 26.5% from 25 to 44, 23.5% from 45 to 64, and 19.7% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 89.8 males. For every 100 females age 18 and over, there were 87.1 males.
The median income for a household in the township was $23,916, and the median income for a family was $31,713. Males had a median income of $26,270 versus $19,938 for females. The per capita income for the township was $13,945. About 16.1% of families and 19.9% of the population were below the poverty line, including 29.1% of those under age 18 and 12.9% of those age 65 or over.