North Vernon, 2,989, and Vernon, 410, are the incorporated city and town. Jennings County population in 1890 was 14,608; 1900, 15,757; 1910, 14,203; 1920, 13,208; 1930, 11,800.

North Vernon is located sixty miles southeast of Indianapolis and is served by three main railroads. The city has a number of industrial concerns and manufactures lumber, furniture, dustpans, auto fan belts, wood cabinets, flour, and spokes. Also important to the city is quarrying.

Among the city's points of interests are the marker at the site of Guthrie Trail, a bronze tablet on a boulder marking the Madison-Columbus Highway, and the North Vernon City Park.

Jennings County is the site of the Muscatatuck State Park, and the Muscatatuck Colony, a state institution. These take their names from the river that traverses the county. The other chief waterways are Sand Creek, in the northwestern part, and Graham Creek in the southeast. Morgan and his band of Civil War raiders passed through Jennings County.

In the town of Vernon is a woman's club known as The Clionian. It was formed July 17, 1855, and is said to be the oldest Woman's club in Indiana.

Among those who have been important in the history of Jennings County has been Jeptha D. New, twice elected to Congress; Lincoln Dixon, also a congressman; Alonzo G. Smith, Attorney-General of Indiana; Thomas W. Brolley, State Statistician; Thomas J. Reilly, a Collector of Internal Revenue, and John Overmyer, Speaker of the Indiana House of Representatives. Among the best-known native sons is the contemporary psychologist and writer, Dr. Albert Edward Wiggam.

This county had thirteen manufacturing establishments, according to federal census figures of 1935. A total of 316 wage earners were employed on pay rolls totaling $184,551. The value of the manufactured products was $673,516.

The county had 1,765 farms averaging 110.9 acres each. Their value was $3,876,998. A total of 27,686 head of livestock was reported.

Total county tax valuation for the year of 1936 was $8,273,140.