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Petersburg is the quintessential Illinois summer vacation destination.

The town began as a planned community organized by real estate speculators Peter Lukins (for whom the town is named) and George Warburton. Abraham Lincoln worked as the surveyor who first mapped, measured and help to divide lots on the land. Petersburg quickly grew, due to an advantageous placement on the river, becoming the county seat in the 1830s and eventually drawing off the population of New Salem, which was abandoned in 1840.

The name of the river comes from a Pottawatomie word Sain-guee-mon (pronounced "sang gä mun") meaning "where there is plenty to eat." In the 18th century, groups of the Kickapoo settled along the river. In the middle 18th century, the region near the river was the scene of a conflict between the Illini and Fox as part of the larger French and Iroquois Wars. French traders were active in the region throughout the middle 18th century when it was part of the Illinois Country.