Seymour is a census-designated place in Champaign County, Illinois, United States. At the 2010 census, it had a population of 303. Its zip code is 61875 and it is part of Mahomet-Seymour Community Unit School District No. 3.
Seymour is located at 40°06′25″N 88°25′36″W (40.1069769, -88.4267245). It is located in Scott Township, Champaign County, Illinois. Seymour has an area of 0.090 square miles (0.23 km2), all land.