Estimates from the U.S. Census Bureau, indicate that Cherokee County has gone from a population of 13,037 on April 1, 2000 to 12,297 on July 1, 2005.
The estimated 800 person reduction is a loss of 6.1 percent, making Cherokee County the third highest loser in terms of percentage in the state and the tenth top loser in terms of numbers in the state. Only Pocahontas County, with a loss of 8.5 percent of the population, and Sac County, with a loss of 7.9 percent, had larger losses than Cherokee County in terms of percentage in Iowa.
The largest loser in the state in terms of number of people was Black Hawk County, where Waterloo is located. The county lost an estimated 2,122 people but this is only 1.7 percent of the population.
The largest percentage of population gain in Iowa was found in Dallas County, which is just west of the state's most populated county, Polk County where Des Moines is Located. Polk County had the largest numerical gain in population.
Dallas County went from 40,750 to 51,762, a 27 percent increase. This growth spurred by urban spillover from Polk County continues a trend that started well before the latest five year growth estimate.
Polk County went from a population of 374,605 to 401,006, a 7 percent increase.
Overall, the state's population remained fairly flat with an increase of just under 40,000, amounting to 1.4 percent.