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 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.
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.
In the city the population was spread out with 17.9% under the age of 18, 6.3% from 18 to 24, 20.8% from 25 to 44, 23.7% from 45 to 64, and 31.2% who were 65 years of age or older. The median age was 49 years. For every 100 females there were 78.2 males. For every 100 females age 18 and over, there were 76.2 males.
The median income for a household in the city was $33,821, and the median income for a family was $43,375. Males had a median income of $29,205 versus $21,389 for females. The per capita income for the city was $20,132. About 6.6% of families and 10.2% of the population were below the poverty line, including 13.6% of those under age 18 and 9.1% of those age 65 or over.