Jimmerson Lake is an unincorporated community and census-designated place (CDP) in Steuben County, Indiana, United States.
The community is in northern Steuben County, surrounding Jimmerson Lake, one of a chain of lakes. It is northwest of Angola, the county seat, and southeast of Orland.
According to the U.S. Census Bureau, the Jimmerson Lake CDP has a total area of , of which are land and , or 23.60%, are water. Its southeast end receives water via a short channel from Lake James, while its outlet is at its northwest end, into Crooked Creek, which flows west to the Fawn River, a west-flowing tributary of the St. Joseph River leading to Lake Michigan.
The United States Census Bureau delineated Jimmerson Lake as a census designated place in the 2022 American Community Survey.