Keego Harbor is a city in Oakland County in the U.S. state of Michigan. The population was 2,970 at the 2010 census. The city originated as a real estate investment and planned resort established by Pontiac lawyer Joseph E. Sawyer circa 1900. The name Keego is said to mean "big fish" in an Indian language. The harbor is Dollar Lake, that was connected to Cass Lake via a new canal that developer Sawyer had dug when the town was created. The community lies along Cass Lake, one of the lakes that make up the lakes district of western Oakland County, an area renowned for its water recreation resources.