Waterloo Population

2010–2026

160

2026 projection

7.4% since 2020 (increase)

050100150200201020122014201620182020202220242026

Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.

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Population by year

Population estimates for Waterloo. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
2026160+10.63%
2025159+53.25%
2024154+21.32%
2023152+10.66%
2022151+10.67%
2021150+10.67%
2020149-2212.87%
2019171+31.79%
2018168-21.18%
201717000.00%

Showing 10 of 17 years.

Waterloo Demographics

49median age

Median age

Female49.4 yrs
Male40.5 yrs

Adults

158
57 seniors · 36%101 other adults

Sex

Female 41% · 87Male 59% · 125

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101

Race and ethnicity

Tap a square or a group below to highlight it.

Each square is about 1% of residents (roughly 2 people).

Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002

Waterloo Marital Status

32% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married32%38%25%
Never married41%30%53%
Divorced9%13%5%
Widowed6%0%13%
Separated12%19%4%

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201