Armington is a village in Tazewell County, Illinois, United States. The population was 368 at the 2000 census. It is part of the Peoria, Illinois Metropolitan Statistical Area.Armington is located at 40°20′21″N 89°18′49″W / 40.33917°N 89.31361°W / 40.33917; -89.31361.According to the 2010 census, Armington has a total area of 0.29 square miles, all land.As of the census of 2000, there were 368 people, 135 households, and 98 families residing in the village. The population density was 1,283.7 people per square mile. There were 152 housing units at an average density of 530.2 per square mile. The racial makeup of the village was 99.46% White, and 0.54% from two or more races. Hispanic or Latino of any race were 2.72% of the population.There were 135 households out of which 39.3% had children under the age of 18 living with them, 65.2% were married couples living together, 6.7% had a female householder with no husband present, and 26.7% were non-families. 25.