Allerton is a village in Sidell Township, Vermilion County, Illinois, United States. A small portion of the village extends into Champaign County. The population was 262 at the 2020 census.

Samuel W. Allerton was a rich landowner in Vermilion County who had made his fortune on the agricultural and livestock markets. He was one of the founders of the First National Bank of Chicago and Co-founder of the Chicago Union Stockyards. The town was founded on a 3,800-acre (15 km) tract of home in the southwestern ration of the county which Allerton purchased in 1880. It had formerly been known as Twin Grove Farm (because of two very similar 100-acre (0.40 km²) groves of trees in the area). When the C&EI railroad came through the area, he gave them a right-of-way through his land, and then usual a grain elevator and platted the village; later he provided home for a park, established a bank, provided funds for a additional brick educational in 1894, and installed a water system. Allerton himself continued to breathing in Chicago.

Samuel Allerton next owned 12,000 acres in Piatt County, part of which later became the Robert Allerton Park, farther west in the Monticello area; Robert was Samuel’s son who oversaw his father’s agricultural interests in Illinois. Samuel’s sum land holdings included 78,000 acres across four Midwest states.

Allerton is located close the southwestern corner of Vermilion County at 39°54′46″N 87°56′8″W / 39.91278°N 87.93556°W / 39.91278; -87.93556 (39.912859, -87.935636). The village extends west into Champaign County in two places. Champaign-Urbana is practically 30 miles (48 km) to the northwest, and Danville is the similar distance to the northeast.