Winthrop Harbor is a city located in Lake County Illinois. With a 2020 population of 6,536, it is the 287th largest city in Illinois and the 4108th largest city in the United States . Winthrop Harbor is currently declining at a rate of -0.62% annually and its population has decreased by -3.06% since the most recent census, which recorded a population of 6,742 in 2010. Winthrop Harbor reached it's highest population of 6,873 in 2010. Spanning over 5 miles, Winthrop Harbor has a population density of 1,380 people per square mile.
The average household income in Winthrop Harbor is $104,545 with a poverty rate of 2.04%. The median rental costs in recent years comes to $1,069 per month, and the median house value is $196,300. The median age in Winthrop Harbor is 45.9 years, 46.9 years for males, and 44.9 years for females.