Mcnabb is located in Putnam county Illinois with a geographic area of 0.2 square miles. The total population in Mcnabb is 237 with 44.3% male and 55.7% female. Children under age 5 represent 4.2% of the population, under age 18 equal 13.9% of the population and over age 65 is 19.8% of the population. The median household income is $68,125, per capita income is $30,632. There are a total of 101 housing units with 80.2% owner occupied. Education includes 36.6% of residents that are high school graduates and 19.8% with a bachelor's degree or higher. The average temperature in Mcnabb in the summer is 74 degrees, and in the winter 27 degrees.