Nessen City is an unincorporated community and census-designated place in Benzie County in the U.S. state of Michigan.

Nessen City is located along the southern border of Colfax Township in southeastern Benzie County.

According to the United States Census Bureau, the CDP has a total area of 1.2 square miles (3.1 km2), all land.

The primary sectors in Nessen City are Manufacturing, employing 14 individuals, followed by Health Care & Social Assistance with 7 employees, and Finance & Insurance with 4 personnel.

The community of Nessen City was listed as a newly-organized census-designated place for the 2010 census, meaning it now has officially defined boundaries and population statistics for the first time.