Kappa is a village located in the U.S. state of Illinois. It is within Woodford County included in the Peoria, Illinois Metropolitan Statistical Area. It has a total area of 0.36 square miles at 40°40′35″N 89°0′34″W. The elevation is 729 feet above sea level. As of the 2010 census data, it had a total population of 227. The population density was 663.87/sq mi. Estimated per capita income in 2016 was $117,789. It has Zip code 61738.