Rochester is a city located in Sangamon County Illinois. Rochester has a 2020 population of 5,211. Rochester is currently declining at a rate of -0.52% annually and its population has decreased by -1.99% since the most recent census, which recorded a population of 5,317 in 2010. Rochester reached it's highest population of 5,388 in 2012.
The average household income in Rochester is $123,873 with a poverty rate of 2.19%. The median rental costs in recent years comes to $1,069 per month, and the median house value is $199,700. The median age in Rochester is 42.5 years, 40.6 years for males, and 43.6 years for females.