  barnett township is a township in jefferson county, pennsylvania, united states. the population was 272 at the 2000 census. it was named for jefferson county pioneer, joseph barnett. ==geography== according to the united states census bureau, the township has a total area of , of which,  of it is land and  of it (3.77%) is water. ==demographics== as of the census of 2000, there were 272 people, 124 households, and 79 families residing in the township. the population density was 18.7 people per square mile (7.2/kmÂ²). there were 378 housing units at an average density of 26.0/sq&nbsp;mi (10.0/kmÂ²). the racial makeup of the township was 99.63% white, and 0.37% from two or more races. hispanic or latino of any race were 0.37% of the population. there were 124 households out of which 25.8% had children under the age of 18 living with them, 55.6% were 
Townships_in_Jefferson_County,_Pennsylvania Townships_in_Pennsylvania