Creston is a city in and the county seat of Union County, Iowa. The population was 7,536 at the time of the 2020 Census. Creston was or…Creston is a city in and the county seat of Union County, Iowa. The population was 7,536 at the time of the 2020 Census. Creston was originally settled in 1868 as a survey camp for the Burlington and Missouri Railroad. It was named for the fact that it was on the crest of the railroad line between the Missouri and Mississippi river basins. The area was developed largely for agriculture, with related industries accompanying it. Creston had a flour mill in the early decades of the 20th century. The town was officially established in 1869 and incorporated in 1871.
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