Huntsville is an unincorporated community in Union Township, Randolph County, in the U.S. state of Indiana.
Five Forks is an unincorporated community in Gwinnett County in the U.S. state of Georgia near the intersections of River Road, Five Forks Trickum, Oak Road and Dogwood Road.
 It is a former mail-stop served from the mid-1800s to early 1900s by the Yellow River Post Office and still appears on maps as a small unincorporated community between Snellville and Lawrenceville.
 It is connected to another nearby mail-stop called Trickum by the unusually named Five Forks Trickum Road.
 Currently, the center of Five Forks is home to some restaurants and shopping centers, as well as relatively new Ronald Reagan Park across the street from the Five Forks Library branch.
Alabam is an unincorporated community in Madison County, Arkansas, in the United States.
 The community is located on Arkansas Highway 127 about six miles northeast of Huntsville.
 The community of Old Alabam is about one mile south at the intersection of Highway 127 and U.S. Route 412.
 Alabam is on a broad ridge between War Eagle Creek to the southwest and the Kings River to the northeast.
Woodland is an unincorporated community and census-designated place (CDP) in Allegany County, Maryland, United States.
 As of the 2010 census it had a population of 113.
 It is located 4 mi south of Frostburg and just east of the community called Klondike.
Robbins is an unincorporated community and census-designated place (CDP) in Scott County, Tennessee.
 As of the 2010 census, its population is 287.
 It is concentrated along U.S. Route 27 between Huntsville and Elgin, in Tennessee's Cumberland Plateau region.
 The community is served by Robbins Elementary School.
 It is also home to Barton Chapel, a 1920s-era Gothic Revival church designed by noted architectural firm, Barber and McMurry.
Huntsville is an unincorporated community in Columbia County, in the U.S. state of Washington.
Old Alabam is an unincorporated community in Madison County, Arkansas, United States.
 It is located on AR 127 near U.S. Route 412.
 The community is about 4.5 miles northeast of Huntsville and one mile south of the community of Alabam.
Huntsville is an unincorporated community in Reno County, Kansas, in the United States.
Saint Mary-of-the-Woods, often called St. Mary's, is an unincorporated community in Sugar Creek Township in northwestern Vigo County, in the U.S. state of Indiana.
 The community is part of the Terre Haute Metropolitan Statistical Area.
 A large portion of Saint Mary-of-the-Woods along U.S. Route 150 is taken up by the grounds of the Sisters of Providence of Saint Mary-of-the-Woods, which contain the motherhouse of the Sisters of Providence as well as Saint Mary-of-the-Woods College.
 Although Saint Mary-of-the-Woods is unincorporated, it has a post office, with the ZIP code of 47876.
 It had a population of 797 at the 2010 census.
Reno County (standard abbreviation: RN) is a county located in the U.S. state of Kansas.
 As of the 2010 census, the population was 64,511.
 The largest city and county seat is Hutchinson.

Question: What U.S. county has an unincorporated community called Huntsville?
Answer: Reno County