Johnston is a city in Polk County, Iowa, United States. The population was 24,064 in the 2020 census, a large increase from the 8,649 population in 2000. It is part of the Des Moines–West Des Moines Metropolitan Statistical Area.
AdGet our Best Rate for Your Next Hotel Booking. Start Your Travel Planning Today! Create a Hotel Price Alert and Monitor Lodging Fares for Specific Travel Dates.