Pittsfield is a city located in Pike County Illinois. It is also the county seat of Pike County. With a 2020 population of 4,226, it is the 356th largest city in Illinois and the 5251st largest city in the United States . Pittsfield is currently declining at a rate of -0.33% annually and its population has decreased by -7.65% since the most recent census, which recorded a population of 4,576 in 2010. Pittsfield reached it's highest population of 4,587 in 2010. Spanning over 5 miles, Pittsfield has a population density of 886 people per square mile.
The average household income in Pittsfield is $62,308 with a poverty rate of 11.09%. The median rental costs in recent years comes to $594 per month, and the median house value is $98,400. The median age in Pittsfield is 40.3 years, 36.6 years for males, and 44.6 years for females.