<Tr> <Th> GNIS feature ID </Th> <Td> 0076952 </Td> </Tr> <Tr> <Th> Website </Th> <Td> City of Fort Smith </Td> </Tr> <P> Fort Smith is the second - largest city in Arkansas and one of the two county seats of Sebastian County . As of the 2010 Census, the population was 86,209 . With an estimated population of 87,443 In 2012, it is the principal city of the Fort Smith, Arkansas - Oklahoma Metropolitan Statistical Area, a region of 298,592 residents that encompasses the Arkansas counties of Crawford, Franklin, and Sebastian, and the Oklahoma counties of Le Flore and Sequoyah . </P> <P> Fort Smith has a sister city relationship with Cisterna, Italy, site of the World War II Battle of Cisterna, fought by United States Army Rangers commanded by Fort Smith native William O. Darby . The city also has a mutual friendship - city relationship with Jining, China . </P>

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