South Dakota Truck Wash South Dakota Truck Wash - Historically dominated by an agricultural economy and a rural lifestyle, South Dakota has recently sought to diversify its economy in an effort to attract and retain residents. The state is still largely rural, though, with one of the lowest population densities in the United States.The centrally-located city of Pierre serves as the state capital, and Sioux Falls, with 145,000 people, is the largest city in the state.According to the U.S. Bureau of Economic Analysis, the gross state product of South Dakota was $29.4 billion as of 2004. The per capita personal income was $26,894 in 2004, the 37th highest in the nation and 13.08 percent below the national average. 13.2% of the population is below the poverty line.South Dakota for auto glass auto insurance auto salvage auto trade auto traders bike parts bmw parts body parts chevy truck commercial truck commercial vehicles computer parts diesel truck dodge caliber dodge charger dump truck dump trucks electric vehicles euro car parts excite truck fire truck fire trucks floor mats fork lift truck truck mud flaps truck performance truck photo truck pic truck picture truck price truck prices truck rentals truck.Two major interstate highways pass through South Dakota: Interstate 90, which runs east and west; and Interstate 29, running north and south in the eastern portion of the state. The counties and towns along Interstate 29 make up what is locally referred to as "the I-29 corridor". This area features generally higher rates of population and economic growth than areas in eastern South Dakota that are further from the interstate. Interstate 90, being a major route between western national parks and large cities to the east, brings many out-of-state travelers through South Dakota, thus helping to boost the tourism and hospitality industries. Also located in the state are the shorter interstates 190, a spur into central Rapid City, and 229, a loop around eastern and southern Sioux Falls.South Dakota license plates are numbered by county, with the first digit referring to the county of origin. Such a numbering system allows one to easily determine where the vehicle was registered. Counties 1–9 are ranked by 1950 population , and counties 10–64 are numbered alphabetically.