Lake City is a city in the U.S. state of Michigan. It is the county seat of Missaukee County, and is the largest city within the county. The city is located in the Northern Lower Peninsula of Michigan. As of the 2020 census, the population of Lake City was 829. Lake City has been nicknamed "Michigan's Christmas Tree Capital", due to the high number of farms near the city.

M-66 is a north–south state trunkline highway on the Lower Peninsula of the US state of Michigan. It runs from the Indiana state line in the south to Charlevoix in the north. M-66 is the only state highway to run the north–south distance of the Lower Peninsula. It starts as a continuation of State Road 9 (SR 9), which provides access to the Indiana Toll Road. The total length is approximately 272.9 miles (439.2 km), which includes almost 3.4 miles (5.5 km) of freeway between Interstate 94 (I-94) and downtown Battle Creek designated as I-194. A section of the highway immediately south of I-94 is an expressway, a type of divided limited-access highway, while the section along I-194 is a full freeway; otherwise M-66 is a two-lane rural highway. Two sections are listed on the National Highway System.