It’s a three-paragraph, 30-second story from WHO, but it tells so much. According to the story, based on numbers from the city, Ankeny built 567 new single-family homes and 539 other residences in 2017. That makes for 1106 housing units as defined by the census (or so I interpret).
In 2010, the entire town of Audubon had 1106 housing units, according to the Census of Population and Housing report from 2012 (PDF) that has everything related to those numbers. Now, keep in mind that the percentage of single-family homes there is much greater, but the point is roughly the same: The entire residential complement of a county seat was built new in Ankeny in 12 months.
Two-thirds of Iowa counties had fewer housing units in 2010 than in 2000, according to the census statistics.