Waterloo Flag

Waterloo

County Seat:
Yes
Area (mi²):
61.595
State:
Iowa

Waterloo is a city located in Black Hawk County, Iowa. Waterloo has a 2026 population of 67,477. It is also the county seat of Black Hawk County. Waterloo is currently growing at a rate of 0.93% annually and its population has increased by 0.31% since the most recent census, which recorded a population of 67,266 in 2020.

67.5K
Total Population
1,095
Density (mi²)
621 0.93%
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)