Winthrop Harbor is a village in Lake County, Illinois, United States.

In 1899 the Winthrop Harbor and Dock Company purchased over 2,000 acres just south of the state line of Wisconsin.

In 1871 a post office was built on Sheridan Road named Spring Bluff.

Not only did this spur an increase in population in the area, but it would inspire the name of the Spring Bluff Forest Preserve.

[4] Despite the intention of the setllement to be an industrial district, the village remained mainly residential until 1989 when the North Point Marina was constructed.

The department offers the following bureaus: Patrol, Detectives, Sex Crimes, Communications, CyberCrime, Records, and Evidence/Property.

The Winthrop Harbor Fire Department, founded in 1949, has grown from a small volunteer force to a 24-hour-a-day operation.

They work with two engines, a 75-foot ladder truck, two advanced life support ambulances, one brush unit, a rescue boat and a staff and command car.

Through automatic aid agreements with the surrounding area, the Village receives optimal emergency service.