Iowa · United States
Johnston population
20,871people · latest figure
Johnston has a population of 20,871, making it the 2143rd largest place we list in United States. It is in Iowa.
Johnston holds under a tenth of one per cent of United States's 349,035,494 people. New York City, the largest place we list there, is 422 times its size. Twenty years earlier the World Gazetteer recorded 29,864, a fall of 30%.
The 2005 figure comes from the World Gazetteer archive restored on this site. The two sources may draw the settlement's boundary differently, so treat the change as indicative rather than exact. Why figures differ.
Johnston is in Iowa, which has 456 recorded places.
Nearby in size
| Place | Region | Population |
|---|---|---|
| Silver Firs | Washington | 20,891 |
| Hauppauge | New York | 20,882 |
| Kīhei | Hawaii | 20,881 |
| Gardner | Kansas | 20,868 |
| Ashland | Oregon | 20,861 |
| Sidney | Ohio | 20,858 |
All places in United States → · Iowa →
Figures are the latest available in GeoNames (CC BY 4.0), which draws on national censuses of varying dates — treat them as recent, not same-year. Country totals are UN World Population Prospects 2024 (medium variant) where the UN lists the country separately; the handful it reports under a parent state keep a GeoNames figure and are marked as such. Sources & method.