Jennings is a city in Decatur County, Kansas, United States. As of the 2010 census, the city population was 96.
Jennings is located at 39°40′49″N 100°17′38″W / 39.68028°N 100.29389°W / 39.68028; -100.29389 (39.680197, -100.293918). According to the United States Census Bureau, the city has a total area of 0.3 square miles (0.7 km²), all of it land.
As of the census of 2000, there were 146 people, 73 households, and 41 families residing in the city. The population density was 537.9 people per square mile (208.8/km²). There were 99 housing units at an average density of 364.7 per square mile (141.6/km²). The racial makeup of the city was 100.00% White. Hispanic or Latino of any race were 0.68% of the population.