<P> In 1981, to take advantage of recently relaxed state usury laws, Citibank relocated its primary credit card center from New York City to Sioux Falls . Some claim that this event was the primary impetus for the increased population and job growth rates that Sioux Falls has experienced over the past quarter century . Others point out that Citibank's relocation was only part of a more general transformation of the city's economy from an industrially based one to an economy centered on health care, finance and retail trade . </P> <P> Sioux Falls has grown at a rapid pace since the late 1970s, with the city's population increasing from 81,000 in 1980 to 153,888 in 2010 . </P> <P> Sioux Falls is located at 43 ° 32'11" North, 96 ° 43'54" West (43.536285, − 96.731780). According to the United States Census Bureau, the city has a total area of 73.47 square miles (190.29 km), of which, 72.96 square miles (188.97 km) is land and 0.51 square miles (1.32 km) is water . The city is located in the extreme eastern part of South Dakota, about 15 miles (24 km) west of the Minnesota border . Sioux Falls has been assigned the ZIP codes 57101, 57103--57110, 57117--57118, 57188--57189 and 57192--57198 and the FIPS place code 59020 . </P> <P> The Sioux Falls Metropolitan Statistical Area consists of four counties, all of which are located in South Dakota: Lincoln, McCook, Minnehaha, and Turner . The estimated population of this MSA in 2014 was 248,351, an increase of 6.68% from the 2010 census . According to recent estimates, Lincoln County is the ninth fastest - growing county (by percentage) in the United States . In addition to Sioux Falls, several cities and towns included in the metropolitan area are Canton, Brandon, Dell Rapids, Tea, Harrisburg, Worthing, Beresford, Lennox, Hartford, Crooks, Baltic, Montrose, Salem, Renner, Rowena, Chancellor, Colton, Humboldt, Parker, Hurley, Garretson, Sherman, Corson, Viborg, Irene, and Centerville . </P>

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