Spring bay is located in Tazewell county Illinois with a geographic area of 0.7 square miles. The total population in Spring bay is 473 with 58.6% male and 41.4% female. Children under age 5 represent 4.0% of the population, under age 18 equal 17.3% of the population and over age 65 is 24.3% of the population. The median household income is $38,571, per capita income is $24,145. There are a total of 218 housing units with 70.6% owner occupied. Education includes 50.9% of residents that are high school graduates and 11.5% with a bachelor's degree or higher. The average temperature in Spring bay in the summer is 74 degrees, and in the winter 27 degrees.