Sinclairville is located in Chautauqua county New york with a geographic area of 1.6 square miles. The total population in Sinclairville is 624 with 49.4% male and 50.6% female. Children under age 5 represent 4.0% of the population, under age 18 equal 22.6% of the population and over age 65 is 26.9% of the population. The median household income is $32,353, per capita income is $20,557. There are a total of 290 housing units with 78.6% owner occupied. Education includes 46.6% of residents that are high school graduates and 19.0% with a bachelor's degree or higher. The average temperature in Sinclairville in the summer is 70 degrees, and in the winter 27 degrees.