Waterloo, Iowa

Waterloo population, 2020 to 2024

Waterloo added 211 residents from July 2020 to July 2024, a change of +0.3%. In the latest year it moved by +621. Among 85 Iowa places of 5,000 or more, that growth ranks 49th; the median place changed by +1.1%. The median place of 5,000+ in Iowa has 9,511 people, so Waterloo is 7.1 times that size.

Waterloo covers 61.60 square miles of land and 1.84 of water, for 1,095 people per square mile of land. The median Iowa place of 5,000+ has 1,363, so Waterloo is less dense than the typical town.

What county Waterloo is in

All of Waterloo's residents live in Black Hawk County, which had 132,348 residents in 2024. Waterloo holds 51.0% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Waterloo

4 ZIP Code Tabulation Areas (ZCTAs) overlap Waterloo by at least 10% of the ZCTA's or the city's land: 50701, 50702, 50703, 50707. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.

Where Waterloo is

The Census internal point of Waterloo is at 42.492300, -92.351900. Des Moines, the capital, is 89.5 miles SW in a straight line. The nearest larger place is Cedar Rapids, IA (137,904 people), 50.1 miles away.

Daylight in Waterloo

At 42.49° N, Waterloo gets about 15 h 18 min of daylight around the June solstice and 9 h 04 min around the December solstice, a swing of 6 h 14 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Waterloo

The eight nearest incorporated places of 1,000+ in Iowa, measured between internal points. The closest is Evansdale, 4.6 miles away, with 4,515 people.