Delmar is located in Clinton county Iowa with a geographic area of 0.8 square miles. The total population in Delmar is 491 with 46.2% male and 53.8% female. Children under age 5 represent 7.7% of the population, under age 18 equal 27.5% of the population and over age 65 is 15.9% of the population. The median household income is $66,705, per capita income is $28,943. There are a total of 185 housing units with 91.9% owner occupied. Education includes 25.4% of residents that are high school graduates and 20.5% with a bachelor's degree or higher. The average temperature in Delmar in the summer is 71 degrees, and in the winter 23 degrees.