Pine County is a county located in the U.S. state of Minnesota. As of the 2010 census, the population was 29,750. Its county seat is Pine City. The county was formed in 1856 and organized in 1872. A portion of the Mille Lacs Indian Reservation is in the county.
Pine County was organized on March 1, 1856, with Chisago County being its primary parent county. Other portions of the original Pine County originated from Ramsey County. The original county seat was Chengwatana. In 1857, Buchanan County in full and southern portions of Aitkin and Carlton counties were formed from the original Pine County, with Kanabec County organized a year later. In 1861, Buchanan County was dissolved and folded into Pine County. Pine County was re-organized in 1872, with Pine City becoming the new county seat. Pine County has been featured in a series of Mysteries written by Dean Hovey. The titles include: Where Evil Hides, Hooker, Unforgettable, and Undeveloped. Each of the Hovey books has been nominated for a Northeastern Minnesota Book Award (NEMBA) for their depiction of life in the area.