Chadwick is located in Carroll county Illinois with a geographic area of 0.3 square miles. The total population in Chadwick is 529 with 56.1% male and 43.9% female. Children under age 5 represent 3.6% of the population, under age 18 equal 15.5% of the population and over age 65 is 23.6% of the population. The median household income is $50,000, per capita income is $27,324. There are a total of 256 housing units with 76.2% owner occupied. Education includes 36.3% of residents that are high school graduates and 22.3% with a bachelor's degree or higher. The average temperature in Chadwick in the summer is 74 degrees, and in the winter 27 degrees.