The average household size was 2.45 and the average family size was 2.96. In the county, the population was spread out with 23.60% under the age of 18, 7.70% from 18 to 24, 27.20% from 25 to 44, 23.60% from 45 to 64, and 17.90% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 95.70 males. For every 100 females age 18 and over, there were 92.60 males. Jefferson County is a very safe county for the Republican Party, which has won the vote of all but two presidential elections. Two Pennsylvania state parks are in the county. The Jefferson County Fair is held annually in July. Under Pennsylvania law, there are four types of incorporated municipalities: cities, boroughs, townships, and, in at most two cases, towns. The following boroughs and townships are located in Jefferson County:   The population ranking of the following table is based on the 2010 census of Jefferson County.  † "county seat"