Baylis is a village in Pike County, Illinois, United States. The population was 265 at the 2000 census.Baylis is located at 39°43′43″N 90°54′29″W / 39.72861°N 90.90806°W / 39.72861; -90.90806.According to the 2010 census, Baylis has a total area of 0.47 square miles, all land.As of the census of 2000, there were 265 people, 91 households, and 70 families residing in the village. The population density was 552.8 people per square mile. There were 106 housing units at an average density of 221.1 per square mile. The racial makeup of the village was 98.11% White, 0.38% Asian, and 1.51% from two or more races.There were 91 households out of which 44.0% had children under the age of 18 living with them, 61.5% were married couples living together, 12.1% had a female householder with no husband present, and 22.0% were non-families. 20.9% of all households were made up of individuals and 17.6% had someone living alone who was 65 years of age or older. The average household size was 2.