Brunswick is located in RENSSELAER COUNTY New york with a geographic area of square miles. The total population in Brunswick is 12,941 with 49.6% male and 50.4% female. Children under age 5 represent 4.0% of the population, under age 18 equal 19.1% of the population and over age 65 is 16.7% of the population. The median household income is $91,964, per capita income is $45,473. There are a total of 5,341 housing units with 77.3% owner occupied. Education includes 17.5% of residents that are high school graduates and 42.6% with a bachelor's degree or higher. The average temperature in Brunswick in the summer is 70 degrees, and in the winter 27 degrees.