Saginaw County, officially the County of Saginaw, is a county located in the U.S. state of Michigan. As of the 2020 Census, the population was 190,124. The county seat is Saginaw. The county was created by September 10, 1822, and was fully organized on February 9, 1835. The etymology of the county's name is uncertain. It may be derived from Sace-nong or Sak-e-nong, as the Sauk tribe is believed by some to have once lived there. A more likely possibility is that it comes from Ojibwe words meaning "place of the outlet" –sag and ong. See List of Michigan county name etymologies.

Saginaw is a city in and the seat of Saginaw County, Michigan, United States. The city proper had a population of 44,202 at the 2020 census. Located along the Saginaw River, Saginaw is adjacent to Saginaw Charter Township and considered part of Greater Tri-Cities region of Central Michigan. The Saginaw metropolitan area had a population of 190,124 in 2020. The city is also the largest municipality in the Greater Tri-Cities, with a combined population of 377,474 in the combined statistical area in 2020.