Located on the state lines of Texas and Louisiana, Miller County is home to four Masonic lodges. Texarkana is the county seat and was once called "The Gateway to the Southwest" in reference to travelers moving into Texas.

Ironically, Miller County is cut off from the rest of Arkansas by the Red River. At one time settlers going to Texas considered themselves in Texas when they crossed the Red River at Fulton, Arkansas. Some early maps show Miller County as part of the Texas; however, by the time of the Texas Revolution, most maps and governments agreed that Miller County was firmly part of the State of Arkansas.

Miller County is also the home to the "Rock and Roll Highway 67". The portion of the road named after the time period when the likes of Elvis Presley, Roy Orbison, Johnny Cash, and many other early rock and roll stars would travel down highway 67 into Texarkana, Arkansas to perform at the downtown auditorium.

The county is also home to the Boggy Creek Monster of Fouke, made famous in the 1972 film The Boggy Creek Monster, and shares a common theme of being a part of the famous, cult film The Town That Dreaded Sundown.

The county features the only Federal Courthouse and Post office that sits directly on a state line, and the only shared police department building in the Bi-State Justice Building which also sits directly on a state line.

Miller County