Washington is a city located in Tazewell County Illinois. With a 2020 population of 16,408, it is the 152nd largest city in Illinois and the 2187th largest city in the United States . Washington is currently declining at a rate of -0.33% annually but its population has increased by 8.42% since the most recent census, which recorded a population of 15,134 in 2010. Washington reached it's highest population of 16,672 in 2017. Spanning over 8 miles, Washington has a population density of 1,940 people per square mile.
The average household income in Washington is $90,111 with a poverty rate of 3.61%. The median rental costs in recent years comes to $947 per month, and the median house value is $180,900. The median age in Washington is 38.8 years, 38.2 years for males, and 39.2 years for females.