Question: Mill Iron is an unincorporated community in Carter County, Carter County is a county located in the U.S. state of Montana, and the county seat is Ekalaka, in which country?
Context: Carter County is a county located in the U.S. state of Oklahoma.  As of the 2010 census, the population was 47,557.  Its county seat is Ardmore.  The county was named for Captain Ben W. Carter, a Cherokee who lived among the Chickasaw. Carter County is a county located in the U.S. state of Montana.  As of the 2010 census, the population was 1,160, making it the fifth-least populous county in Montana.  The county seat is Ekalaka. Carter County is a county located in the U.S. state of Kentucky.  As of the 2010 census, the population was 27,720.  Its county seat is Grayson.  The county was formed in 1838 and was named for William Grayson Carter, a state senator at the time of its creation.  The county seat is named for his uncle, Robert Grayson. Grahn is an unincorporated community in Carter County, Kentucky, United States.  It lies along Route 182, east of Olive Hill and southwest of the county seat of Grayson.  Its elevation is 692 feet (211 m).  Although it is unincorporated, it has a post office, with the ZIP code of 41142.  The ZCTA for ZIP code 41142 had a population of 95 at the 2000 census. Tiger Valley is an unincorporated community in Carter County, Tennessee that is located on Tennessee State Route 173 at its junction with U.S. Route 19E.  Tiger Valley is located south of Elizabethton, the county seat of Carter County, and north of Roan Mountain. Alzada, also Stoneville is an unincorporated community and census-designated place in Carter County in the southeastern corner of the U.S. state of Montana.  As of the 2010 census it had a population of 29.  It is located at the intersection of U.S. Route 212 with Montana Secondary Highways 323 and 326, near the Wyoming and South Dakota borders.  The Little Missouri River flows northwards to the west of the community.  Alzada is in the Mountain Time Zone. Boyes is an unincorporated community in southwestern Carter County, Montana, United States.  It lies along U.S. Route 212 southwest of the town of Ekalaka, the county seat of Carter County.  Its elevation is 3,330 feet (1,015 m), and it is located at (45.2680420, -105.0310901).  Although Boyes is unincorporated, it has a post office, with the ZIP code of 59316.  The post office was established in 1906. Carter County is a county located in the U.S. state of Tennessee.  As of the 2010 census, the population was 57,424.  Its county seat is Elizabethton.  The county is named in honor of Landon Carter, an early settler active in the State of Franklin movement. Cottageville (also Moores Mill, Rhodess Mill, or Wrights Mill) is an unincorporated community in western Jackson County, West Virginia, United States.  It lies along West Virginia Route 331 northwest of the city of Ripley, the county seat of Jackson County.  Established in 1858, its elevation is 594 feet (181 m).  Although Cottageville is unincorporated, it has a post office, with the ZIP code of 25239.  It also is the site of the annual Jackson County Junior Fair.  Michael Coleman, a well known early Indian fighter, was killed and buried in the area, according to a historical marker placed by the state of WV.  The wooden Grist Mill located here since the 1840s burned to the ground in the summer of 1965.  Its foundation stones remain.  It had remained in operation full-time until 1930, part-time until 1937.  Cottageville was a commercial center with a bank, newspaper, tannery, blacksmith, several stores, a railroad station on the B & O and many other businesses in the early part of the twentieth century.  Its heyday faded with the closing of the mill and the improvement of roads in the county.  The B & O pulled up its tracks to the county seat, Ripley, in the mid-nineteen-sixties.  Less than a mile from the old town, the county operated what folks called the "poor farm," an early version of a welfare commune.  That closed in the thirties with the New Deal.  That land is now the Jackson County Junior Fairgrounds. Mill Iron is an unincorporated community in Carter County, Montana, United States.  Mill Iron is 16.2 mi east of Ekalaka.  The community had its own post office until January 1, 1994.
Answer: United States