Kappa is a village in Woodford County, Illinois, United States. The population was 227 at the 2010 census, up from 170 in 2000. It is part of the Peoria, Illinois Metropolitan Statistical Area.
Kappa is located at 40°40′35″N 89°0′34″W / 40.67639°N 89.00944°W / 40.67639; -89.00944 (40.676439, -89.009349).
According to the 2010 census, Kappa has a total area of 0.34 square miles (0.88 km), all land.
As of the census of 2000, there were 170 people, 63 households, and 48 families residing in the village. The population density was 747.1 people per square mile (285.4/km²). There were 67 housing units at an average density of 294.5 per square mile (112.5/km²). The racial makeup of the village was 97.06% White, 1.18% Native American, 1.76% from other races. Hispanic or Latino of any race were 2.35% of the population.
There were 63 households out of which 47.6% had children under the age of 18 living with them, 58.7% were married couples living together, 9.5% had a female householder with no husband present, and 23.8% were non-families. 20.6% of all households were made up of individuals and 6.3% had someone living alone who was 65 years of age or older. The average household size was 2.70 and the average family size was 3.08.
In the village, the population was spread out with 32.4% under the age of 18, 5.9% from 18 to 24, 34.1% from 25 to 44, 19.4% from 45 to 64, and 8.2% who were 65 years of age or older. The median age was 32 years. For every 100 females, there were 97.7 males. For every 100 females age 18 and over, there were 94.9 males.
The median income for a household in the village was $46,786, and the median income for a family was $50,417. Males had a median income of $35,417 versus $21,250 for females. The per capita income for the village was $17,451. About 6.0% of families and 9.6% of the population were below the poverty line, including 14.6% of those under the age of eighteen and 12.5% of those sixty five or over.