Greenbriar is located in Pinellas County Florida with a geographic area of 0.6 square miles. The total population in Greenbriar is 2,764 with 39.8% male and 60.2% female. Children under age 5 represent 5.8% of the population, under age 18 equal 16.1% of the population and over age 65 is 18.9% of the population. The median household income is $66,181, per capita income is $39,110. There are a total of 1,219 housing units with 87.2% owner occupied. Education includes 19.2% of residents that are high school graduates and 36.6% with a bachelor's degree or higher. The average temperature in Greenbriar in the summer is 80 degrees, and in the winter 56 degrees.