Butterfield Overland Mail Route Segment

Township of Cove Creek is one of 37 townships in Washington County, Arkansas, USA. As of the 2000 census, its total population was 683. Part of Devil's Den State Park is located in Cove Creek Township.

Strickler (formerly Stricklers) is an unincorporated community in Cove Creek Township, Washington County, Arkansas, United States. It is located on Arkansas Highway 265, northwest of Devil's Den State Park.

Boston Township is one of 37 townships in Washington County, Arkansas, USA. As of the 2010 census, its unincorporated population was 392.

SEFOR (Southwest Experimental Fast Oxide Reactor) was an experimental fast breeder reactor located in Cove Creek Township, Washington County, near Strickler, in northwest Arkansas (20 miles southwest of Fayetteville, Arkansas). The site consisted of a 20-Megawatt (thermal), Sodium-Cooled Test Reactor, a Shop Building, an Operations Building, a Maintenance Shed, and an Electrical Transformer yard. It operated from 1969 to 1972 when the program ended. It was then acquired by the University of Arkansas, in hopes that it could be used as a research facility in 1975, but it never happened. The University maintained the decommissioned site until finally receiving federal funds to dismantle the facility in 2016, which completed in 2019. It used MOX fuel and liquid sodium cooling, and generated 20MW of heat but no electricity. It was constructed particularly to test the suggested inherent safety features of the oxide fuel/sodium cooling configuration, and in particular the effect on the core of thermal expansion, including in an accident situation. The belief that this would stabilize the core was confirmed. The design concept of using thermal expansion to stabilize a reactor core has since been featured in other reactor designs, notably in the pebble bed reactor, which is however neither a fast neutron reactor nor a breeder reactor, and in subsequent Fast breeder reactors. SEFOR operated from 1969 to 1972, when the original program was completed as planned. It was privately operated by General Electric and funded by the United States government through the Southwest Atomic Energy Associates, a nonprofit consortium formed by 17 power companies of the Southwest Power Pool and European nuclear agencies. A proposal for funding to extend its operation to 1977 was rejected prior to the closure in 1972. The fuel and irradiated sodium coolant were removed and taken offsite later in 1972, and the facility was placed in safe storage. The reactor was acquired by the University of Arkansas in 1975, and was used to calibrate equipment and as a research tool for graduate students. SEFOR was designated a Nuclear Historic Landmark site in October 1986, and that same year the university stopped using the facility but continued to maintain surveillance through maintenance activities and periodic visits to the reactor. A caretaker also lived on site in the former Visitors’ Center.

KRMW (94.9 FM) is a radio station licensed to Cedarville, Arkansas, United States. It serves the Fayetteville/Fort Smith area. The station is owned by Cumulus Media.

Skylight is an unincorporated community in Boston Township, of southwestern Washington County, Arkansas, United States. Skylight lies about one mile west-northwest of Skylight Mountain (elev. 1,880 feet (570 m)).

Odell (formerly Stop) is an unincorporated community in Boston Township in southwestern Washington County, Arkansas, United States. The community is one mile north of the county line and the north boundary of the Ozark–St. Francis National Forest. Evansville is four miles west-northwest on Arkansas Highway 59 adjacent to the Arkansas - Oklahoma state line. Stop first had a postmaster in 1884, one of its co-founders. The community moved from Crawford County north of the county line into Washington County in 1930.

Onda is an unincorporated community in Valley Township, Washington County, Arkansas, United States. It is located on County Route 29 (Malico Mountain Road) south of Prairie Grove.

Morrow is an unincorporated community and census-designated place (CDP) in Washington County, Arkansas, United States. A post office has been in operation at Morrow since 1883; The community had the name of G. W. Morrow, an early postmaster. it was first listed as a CDP in the 2020 census with a population of 263; Morrow is located in the Northwest Arkansas region 6.5 miles (10.5 km) south of Lincoln. Morrow has a post office with ZIP code 72749.

Hubbard (formerly Hubard) is an unincorporated community in Valley Township, Washington County, Arkansas, United States. It is located near the intersection of Washington County Road 21 and Hubbard Road.A post office called Hubard was established in 1888, and remained in operation until 1907.

Clyde (historically Newtown) is an unincorporated community in Cane Hill Township, Washington County, Arkansas, United States. Clyde is on Arkansas Highway 45, approximately 26 miles southwest of Fayetteville and six miles east of the Oklahoma border. Within the Canehill, Arkansas ZIP code (72717), the population of the ZCTA was 847 at the 2000 census. It is part of the Northwest Arkansas region. A post office was established at Clyde in 1879, and closed the next year.

Morrow Township is one of thirty-seven townships in Washington County, Arkansas, USA.