| Official Name: | Petrea, Ohio |
| Settlement Type: | Unincorporated community |
| Mapsize: | 250px |
| Pushpin Map: | Ohio |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Ohio |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Jackson |
| Unit Pref: | Imperial |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Footnotes: | [1] |
| Elevation M: | 210 |
| Elevation Ft: | 689 |
| Coordinates: | 39.0733°N -82.6008°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 45640 |
| Area Code: | 740 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1044407 |
Petrea is an unincorporated community in Lick Township, Jackson County, Ohio, United States. It is located on Ohio State Route 788 between Jackson and Wellston, at the intersection of Fairgreens Road (County Road 78), at 39.0733°N -82.6008°W.[2]
The "Petrea Mine" was Jackson County's first Number 2 "Quakertown" coal mine attached to a railroad, the Marietta and Cincinnati Railroad. 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 Swtich" just west of Petrea with a tipple at the end.[3]
The Petrea Post office was originally established on January 3, 1879 and discontinued on February 16, 1880. At the time, the mail service was being handled through the Jackson branch. The post office was then re-established on December 11, 1900 and ultimately discontinued again on December 31, 1901. Mail service is now handled through the Roads branch.