Petrea is an unincorporated community in Lick Township, Jackson County, Ohio, United States.

Around the end of the Civil War, there was a small slope mine owned by William T. McClintock that was rich in Number 2 "Quakertown" coal.

It was located about a half mile away from the Petrea Station though, and over a number of ridges, so it was inaccessible to the railroad.

At the time, the coal was being transported the half mile to the railroad by mules pulling carts on a private narrow gauge track from the mine, but in 1866, the M&C railroad built the "Armstong Switch" just west of Petrea with a tipple at the end.

[4] The Petrea Post office was originally established on January 3, 1879, and discontinued on February 16, 1880.