Oblong is a village in Crawford County, Illinois, United States.

[4] The original town site was on a naturally occurring oblongular prairie, hence the name.

The crossroads at the town site was the location of a general store owned by Henry Peck.

Peck" gave rise to the village's original moniker, Henpeck.

It is the home of the Illinois Oil Field Museum and Resource Center, a collection of early oilfield artifacts from the early days of the oil industry in the Illinois Basin and a resource center featuring a collection of early oil field records and resource books.