Keystone Flag

Keystone

County:
Benton County
County Seat:
No
Area (mi²):
0.448
State:
Iowa

Keystone is a city located in Benton County, Iowa. Keystone has a 2026 population of 616. Keystone is currently declining at a rate of -0.48% annually but its population has increased by 2.67% since the most recent census, which recorded a population of 600 in 2020.

616
Total Population
1,375
Density (mi²)
-3 -0.48%
Growth

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)