Kittson County is a county located in the U.S. state of Minnesota. As of the 2010 census, the population was 4,552. Its county seat is Hallock. It is named after Canadian fur trader and railroad entrepreneur Norman Kittson. The county was officially organized on February 25, 1879, having been part of the Pembina District prior to that time. The county also included the western portion of what is now Roseau County until 1894.