Oregonia, Ohio

Mathers Mill, alternately called Mathers Mills or Mather's Mills, is an unincorporated community in Warren County, Ohio, United States. It is approximately 5 miles east of Lebanon, and 2 miles south of Oregonia in eastern Turtlecreek Township. The area is served by the Oregonia post office, and Lebanon phone exchange and school district. Wilmington Road crosses the Little Miami River and intersects Corwin Road in this area. The bridge is known as the Mathers Mill bridge and the steep hill up out of the valley is sometimes referred to as Mathers Mill Hill. The area is named for a mill once owned by Richard Mather, which no longer exists. The settlement was a stop for the Little Miami Railroad. Mathers Mill is now a public access point with parking for the Little Miami Bike Trail, and canoe and fishing access point to the Little Miami River. A private canoe livery is located in the area on the east side of the river.

San Mar Gale is an unincorporated community and was a planned development by the Hines-Griffin Land Development Company in Turtlecreek of Warren County, Ohio, United States. This 2500+ home planned unit development was approved by the Warren County Commissioners in February 2006. Zoning approval included a central business district and multi-family housing near the center. A public referendum challenging the approval was placed on the ballot in November 2006, and the Commissioners approval was ratified by voters. Construction was to have begun in 2007, however the development was cancelled as of February 2011.The development was to take place on a 3,329-acre (13 km2) group of farms formerly owned by Ralph J. Stolle, a prominent inventor, businessman and philanthropist in Warren County. The name "San Mar Gale" came from the name of his farm, and was derived from combination of the names of Stolle's daughters, Sandy, Mary Jo, and Gail. Until Stolle's death in 1996, the farm was used as a research farm for milk production. A private airport called San Mar Gale (airport code OH79) existed on the farm until the late 1990s but has since been closed. San Mar Gale was to occupy a large portion of the area between Lebanon and Oregonia. Its approximate boundaries were Wilmington Road to the south; North Nixon Camp Road, Emmons Road, and the Little Miami River to the east; the Wayne Township line with a small portion crossing into that township, and Shoemaker Road to the north; and Liberty-Keuter Road to the west. The planned business district was centered on the intersection of Oregonia, Emmons, and Waynesville Roads. The planned community would have been in the Lebanon City School District. The eastern half would have been served by the Oregonia (45054) post office, and the western half served by the Lebanon (45036) post office. Telephone service would be in the Lebanon telephone exchange served by Embarq, public water was to be provided by Western Water Company, and sewer was to be constructed on site by the developers with plans for turning the operations over to Warren County or being operated as a private utility. The community was to be partially financed by a little used program called "new community authority", which allowed cost of infrastructure to be added to the property taxes of the homeowners in the development.

The Bone Stone Graves are a prehistoric cemetery in the southwestern part of the U.S. state of Ohio. Located northwest of the unincorporated community of Oregonia in northwestern Washington Township, Warren County, the cemetery is composed of an uncertain number of graves of individuals from the Fort Ancient culture of Native Americans.: 1373 Graves at the site are composed of bodies contained within limestone stone box graves. A cemetery of this type from the Fort Ancient period is very uncommon, making the Stone Graves a valuable archaeological site.: 1373  Increasing the significance of the area is a complex of other nearby Fort Ancient sites, including the Bone Mound II that is only 500 feet (150 m) away. Because most Fort Ancient sites include only a single type of burials, rather than both a mound and a cemetery, it is believed that the vicinity of the Stone Graves may have been inhabited by people of two different foci.: 1372  In the future, more information may be gained from the cemetery, for the site has never been subject to an archaeological excavation.: 1373 On July 15, 1974, the Bone Stone Graves were listed on the National Register of Historic Places because of their archaeological value. The Bone Mound II was listed on the Register on the same day.

The Bone Mound II is a Native American mound in the southwestern part of the U.S. state of Ohio. Located northwest of the unincorporated community of Oregonia, the mound sits in an area of light woodland.At a height of 4 feet (1.2 m) and a diameter of 50 feet (15 m), it is believed to have been built by people of the Fort Ancient culture. Although it has never been excavated, multiple confirmed Fort Ancient sites, including mounds and two cemeteries, are located within 1 mile (1.6 km) of the Bone Mound II. The closest of these sites, a rare cemetery composed of limestone burial vaults, is only about 500 feet (150 m) away.The Fort Ancient people are known to have used burial vaults, pits, and two types of mounds for the burial of their dead. However, most areas with such a high concentration of Fort Ancient sites employ only a single method of burial. Because the area around the Bone Mound II shows evidence of multiple methods of burial, it may have been occupied by multiple foci of the Fort Ancient people; consequently, the region is very valuable archaeologically.On July 15, 1974, the Bone Mound II was listed on the National Register of Historic Places because of its potential to be an archaeological site. The Bone Stone Graves, the cemetery with limestone vaults, was listed on the Register on the same day.

Fort Ancient (33 WA 2) is a Native American earthworks complex located in Washington Township, Warren County, Ohio, along the eastern shore of the Little Miami River about seven miles (11 km) southeast of Lebanon on State Route 350. The site is the largest prehistoric hilltop enclosure in the United States with three and one-half miles (18,000 ft) of walls in a 100-acre (0.40 km2) complex. Built by the Hopewell culture, who lived in the area from the 200 BC to AD 400, the site is situated on a wooded bluff 270 feet (82 m) above the Little Miami. It is the namesake of a culture known as Fort Ancient who lived near the complex long after it was constructed. Maintained as a state historical park, the site was designated a National Historic Landmark for its significance. The State of Ohio purchased the land and made it Ohio's first state park in 1891. In addition, this is part of the Hopewell Ceremonial Earthworks, one of 14 sites nominated in January 2008 by the U.S. Department of the Interior for potential submission by the United States to the UNESCO World Heritage List. It was officially designated a World Heritage Site in September 2023 together with the earthworks at Hopewell Culture National Historical Park and the Newark Earthworks.

The Crossed Keys Tavern, also known as the Cross Keys Tavern is a historic stone building located in Turtlecreek Township near Lebanon, Ohio. It is across the Little Miami River from the former Fort Ancient village. Built in 1802, it was operated as a tavern from 1809–1820.On October 21, 1976, it was added to the National Register of Historic Places.

Cowen Run is a stream in the U.S. state of Ohio.Cowen Run was named in honor of a local family. A variant name was "Cowens Run".

Washington Township is one of the eleven townships of Warren County, Ohio, United States. Located in the east-central part of the county, it is the only one of the eleven that does not contain a municipality. The population was 2,752 at the 2020 census.

Hammel and Millgrove are extinct towns in western Warren County, Ohio, United States. They are located along the Little Miami River, about 2 miles (3 km) south of Fort Ancient and 1 mile (1½ km) north of Roachester at the Strout Road crossing of the river. Hammel lies on the eastern shore of the river, in southwestern Washington Township, and Millgrove lies on the western shore of the river, in northeastern Salem Township. Hammel had its start in the 1840s when the railroad was extended to that point. The community was named after its founder. The GNIS considers Hammel to be a ghost town.

Newman Run is a stream in the U.S. state of Ohio. It is a tributary to the Little Miami River. Newman Run was named after Jonathan Newman, the proprietor of a watermill along its course. Newman Run is one of many streams in Warren County named after settlers.

Dodds is an unincorporated community in eastern Clearcreek Township, Warren County, Ohio, United States, formerly on the Cincinnati, Lebanon and Northern Railway.

The Waynesville Greek Revival Houses, at 5303 and 5323 Wilkerson Lane in Waynesville, Ohio, were listed on the National Register of Historic Places in 1979.The listing consists of two Greek Revival houses: the Jacob McKay House (also known as "Doric Hill") and the McClelland-Cook House. The McKay house was built in 1848.