As of the census of 2010, there were 1,079 people, 498 households, and 291 families living in the village. The population density was. There were 570 housing units at an average density of. The racial makeup of the village was 98.1% White, 1.4% African American, 0.1% Native American, and 0.4% from two or more races. Hispanic or Latino of any race were 0.1% of the population. There were 498 households of which 23.5% had children under the age of 18 living with them, 40.2% were married couplesliving together, 13.1% had a female householder with no husband present, 5.2% had a male householder with no wife present, and 41.6% were non-families. 36.1% of all households were made up of individuals and 15.6% had someone living alone who was 65 years of age or older. The average household size was 2.11 and the average family size was 2.69. The median age in the village was 46.4 years. 17% of residents were under the age of 18; 8.6% were between the ages of 18 and 24; 22.6% were from 25 to 44; 29.8% were from 45 to 64; and 22.1% were 65 years of age or older. The gender makeup of the village was 47.5% male and 52.5% female.
2000 census
As of the census of 2000, there were 1,230 people, 534 households, and 330 families living in the village. The population density was 2,013.0 people per square mile. There were 600 housing units at an average density of 981.9 per square mile. The racial makeup of the village was 97.07% White, 1.63% African American, 0.33% from other races, and 0.98% from two or more races. Hispanic or Latino of any race were 0.33% of the population. There were 534 households out of which 27.9% had children under the age of 18 living with them, 45.7% were married couples living together, 13.1% had a female householder with no husband present, and 38.2% were non-families. 33.3% of all households were made up of individuals and 18.5% had someone living alone who was 65 years of age or older. The average household size was 2.25 and the average family size was 2.88. In the village, the population was spread out with 22.8% under the age of 18, 9.0% from 18 to 24, 23.0% from 25 to 44, 19.8% from 45 to 64, and 25.4% who were 65 years of age or older. The median age was 41 years. For every 100 females, there were 94.3 males. For every 100 females age 18 and over, there were 83.8 males. The median income for a household in the village was $29,583, and the median income for a family was $37,250. Males had a median income of $31,063 versus $20,909 for females. The per capita income for the village was $15,957. About 7.4% of families and 10.0% of the population were below the poverty line, including 16.9% of those under age 18 and 4.3% of those age 65 or over.
The climate in this area is characterized by relatively high temperatures and evenly distributed precipitation throughout the year. According to the Köppen Climate Classification system, Yorkville has a Humid subtropical climate, abbreviated "Cfa" on climate maps.
