Winthrop Harbor is a village in Lake County, Illinois, United States. Winthrop Harbor is considered the corner stone of Illinois. Per the 2020 census, the population was 6,705. It is located along the northern border of Illinois and is part of the Chicago metropolitan area. Winthrop Harbor is known for its North Point Marina, and is a warning demarcation point for the National Weather Service's marine warnings for Lake Michigan. With moorage over 1,500 boats, it is the largest marina on the Great Lakes. Nearly one million visitors take advantage of the marina, its associated beaches and other recreational facilities every summer. History Winthrop Harbor was named after Winthrop, Massachusetts. In 1918, the Saturday Evening Post had an article about the truck manufacturing plant in Winthrop Harbor. At the time, the Winther plant had been in operation for one year. Geography According to the 2010 census, Winthrop Harbor has a total area of , of which (or 98.09%) is land and (or 1.91%) is water. Demographics 2020 census Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos can be of any race. 2010 Census As of the 2010 United States Census, there were 6,742 people living in the village. The racial makeup of the village was 90.94% White, 1.44% Black or African American, 2.31% Asian, 0.39% Native American, 0.01% Pacific Islander, 2.03% of some other race and 2.88% of two or more races. 7.64% were Hispanic or Latino (of any race). As of the census of 2000, there were 6,670 people, 2,370 households, and 1,884 families living in the village. The population density was . There were 2,435 housing units at an average density of . The racial makeup of the village was 93.79% White, 0.57% African American, 0.49% Native American, 1.90% Asian, 0.01% Pacific Islander, 1.51% from other races, and 1.71% from two or more races. Hispanic or Latino of any race were 4.54% of the population. There were 2,370 households, out of which 40.1% had children under the age of 18 living with them, 66.8% were married couples living together, 8.4% had a female householder with no husband present, and 20.5% were non-families. 17.0% of all households were made up of individuals, and 5.1% had someone living alone who was 65 years of age or older. The average household size was