Fredonia is also the proven geographic center of Mercer County, Pennsylvania. The brass placard being located on the premisis of "Fredonia Stainless Exhaust" on the southwest corner of Main St. and 1st St.
There were 252 households out of which 34.5% had children under the age of 18 living with them, 56.0% were married couples living together, 12.3% had a female householder with no husband present, and 26.6% were non-families. 23.0% of all households were made up of individuals and 9.5% had someone living alone who was 65 years of age or older. The average household size was 2.59 and the average family size was 3.03.
In the borough the population was spread out with 27.6% under the age of 18, 9.2% from 18 to 24, 26.7% from 25 to 44, 23.6% from 45 to 64, and 12.9% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 96.4 males. For every 100 females age 18 and over, there were 87.3 males.
The median income for a household in the borough was $37,917, and the median income for a family was $39,643. Males had a median income of $32,857 versus $19,500 for females. The per capita income for the borough was $14,233. About 17.6% of families and 19.2% of the population were below the poverty line, including 35.6% of those under age 18 and 13.2% of those age 65 or over.