Frankfort is a city in Benzie County in the U.S. state of Michigan. The population was 1,513 at the 2000 census. The elevation of Frankfort is 600 ft (180 m) above sea level. The city is situated with Lake Michigan to the west, Lake Betsie, formed by the Betsie River before flowing into Lake Michigan, on the south and Crystal Lake Township to the north and east. The city is on M-22 just north of Elberta. M-115 has its western terminus in the city. The Frankfort North Breakwater Lighthouse is at the end of the northern breakwater in Lake Michigan.
As of the census of 2000, there were 1,513 people, 665 households, and 395 families residing in the city. The population density was 1,084.4 per square mile (417.3/km²). There were 873 housing units at an average density of 625.7 per square mile (240.8/km²). The racial makeup of the city was 95.84% White, 0.33% African American, 2.31% Native American, 0.26% Asian, 0.13% from other races, and 1.12% from two or more races. Hispanic or Latino of any race were 1.78% of the population.
There were 665 households out of which 20.9% had children under the age of 18 living with them, 46.9% were married couples living together, 9.6% had a female householder with no husband present, and 40.6% were non-families. 36.1% of all households were made up of individuals and 21.4% had someone living alone who was 65 years of age or older. The average household size was 2.11 and the average family size was 2.71.