Forreston is a city located in Ogle County Illinois. With a 2020 population of 1,333, it is the 577th largest city in Illinois and the 9163rd largest city in the United States . Forreston is currently declining at a rate of -0.30% annually and its population has decreased by -7.81% since the most recent census, which recorded a population of 1,446 in 2010. Forreston reached it's highest population of in . Spanning over 1 miles, Forreston has a population density of 1,413 people per square mile.
The average household income in Forreston is $70,679 with a poverty rate of 10.80%. The median rental costs in recent years comes to $683 per month, and the median house value is $96,000. The median age in Forreston is 35.8 years, 33.2 years for males, and 37.4 years for females.