Meridian is located in Butler county Pennsylvania with a geographic area of 2.8 square miles. The total population in Meridian is 4,023 with 44.7% male and 55.3% female. Children under age 5 represent 4.8% of the population, under age 18 equal 18.8% of the population and over age 65 is 26.6% of the population. The median household income is $78,735, per capita income is $44,138. There are a total of 1,779 housing units with 88.4% owner occupied. Education includes 37.8% of residents that are high school graduates and 30.4% with a bachelor's degree or higher. The average temperature in Meridian in the summer is 73 degrees, and in the winter 33 degrees.