Osage County, Missouri
Osage County ( OH-sayj) is a county in the central part of the U.S. state of Missouri. As of the 2020 census, the population was 13,274. Its county seat is Linn. The county was organized January 29, 1841, and named from the Osage River.
Osage County is part of the Jefferson City, Missouri Metropolitan Area. Its geography and the founding of Westphalia Vineyards links it to the Missouri Rhineland, extending along the Missouri River valley to the western edges of the St. Louis Metropolitan Area.
According to data from the 2010 census, Osage County is the whitest county in Missouri, with 98.85 percent of residents being white.