Question: WRBJ-FM is licensed to a city in what Mississippi county?

Context paragraphs:
Mississippi County, Arkansas: Mississippi County is a county located in the U.S. state of Arkansas.  As of the 2010 census, the population was 46,480.  There are two county seats, Blytheville and Osceola.  The county was formed on November 1, 1833, and named for the Mississippi River which borders the county to the east.  Mississippi County is part of the First Congressional District in Arkansas.  The Mississippi County Judge is Randy Carney.

Brandon, Mississippi: Brandon is a city in Rankin County, Mississippi.  The population was 21,705 at the 2010 census.  It is the county seat of Rankin County.  Brandon is part of the Jackson Metropolitan Statistical Area and located east of the state capital.

Missouri Route 102: Route 102 is a highway in Mississippi County, Missouri.  Its northern (or western) terminus is at Route 105 northeast of East Prairie; its southern (or eastern) terminus is at Route 77 in southeastern Mississippi County.

Buffalo Island: Buffalo Island is a local name given to western Mississippi County and eastern Craighead County, Arkansas.  It consists of the land south of Big Lake between the Little River (not to be confused with a stream of the same name in southwestern Arkansas) and the St. Francis River, containing the communities of Manila (Mississippi County), Monette (Craighead County), Leachville (Mississippi County), Black Oak (Craighead County), and Caraway (Craighead County)."

Moore House (Charleston, Missouri): Moore House, also known as the James Handy and Mary Hunter Moore House, is a historic home located at Charleston, Mississippi County, Missouri.  It was built in 1899-1900, and is a 2 1/2-story, Colonial Revival style red brick dwelling.  It measures approximately 65 feet by 47 feet and is topped by a hipped roof with gables.  The front facade features a columned and balustraded veranda, with pedimented entry.  The building houses the Mississippi County Historical Society.

Mississippi County Airport: Mississippi County Airport (ICAO: KCHQ, FAA LID: CHQ) is a public use airport in Mississippi County, Missouri, United States.  It is owned by the Mississippi County Commission and located four nautical miles (5 mi, 7 km) south of the central business district of Charleston, Missouri.

Rivercrest School District: Rivercrest School District, formerly Southern Mississippi County School District, is a public school district based in Rivercrest High School in unincorporated Mississippi County, Arkansas, United States, in proximity to Marie and with a Wilson postal address.  The school district provides early childhood, elementary and secondary education for more than 1,300 prekindergarten through grade 12 students and employs more than 220 staff (including faculty) at its two facilities.  The district encompasses 363.77 mi2 of land in Mississippi County.

Charleston, Missouri: Charleston is a city in Mississippi County, Missouri, United States.  The population was 5,947 at the 2010 census.  It is the county seat of Mississippi County.  It is a home to a local correctional facility.

WRBJ-FM: WRBJ-FM (97.7 FM) is an urban contemporary radio station in Jackson, Mississippi, but licensed to Brandon, Mississippi.  The station is owned and operated by Roberts Broadcasting, former owners of The CW television affiliate WRBJ.  Its studios are located at The Roberts Building along State Street in Jackson, just two blocks north of the Mississippi State Capitol building, and the transmitter tower is south of Brandon.

Mississippi County Courthouse (Osceola, Arkansas): The Mississippi County Courthouse is a courthouse at Poplar Street and Hale Avenue in Osceola, Arkansas, United States, one of two county seats of Mississippi County, built in 1912.  It was listed on the National Register of Historic Places in 1978.  The courthouse was built in the Classic Revival style by John Gainsford and anchors the Osceola town square.

Supporting paragraphs: WRBJ-FM Brandon, Mississippi
Answer: Rankin County