Waterville, Iowa Demographics & Population 2026

A note before these figures: with a population of 137, Waterville's ACS estimates come from a small number of survey responses and carry wide margins of error. Individual percentages below — particularly rates that round to 0% or 100% — are approximations, not precise measurements. See data.census.gov for the published margins of error.

Population Overview

Waterville is a small community located in Iowa, within Allamakee County. The total population is 137. It ranks as the 791st most populous out of 1,017 Census-designated places in Iowa.

Age Demographics

The median age in Waterville is 50.5 years. This is 31% higher than the state median of 38.6 years. With 28.5% of the population under 18, Waterville has a notably young demographic profile, suggesting a family-oriented community.

Economy, Income & Housing

The median household income in Waterville is $44,750. This is 40% lower than the state median of $75,059. It is also 45% lower than the national median of $80,734. The poverty rate stands at 6.6%. This is 41% lower than the state poverty rate of 11.1%. The survey records no unemployed residents in Waterville, which reflects the size of the sample rather than a labor market without joblessness. The median home value is $99,000. Housing costs are 52% lower than the state median of $208,000. With a home-value-to-income ratio of just 2.2x, Waterville is one of the most affordable housing markets in the area. 94.1% of occupied housing units are owner-occupied. This homeownership rate is 31% higher than the state average of 71.7%.

Race & Ethnicity

Waterville has a predominantly White (non-Hispanic) population, comprising 95.6% of all residents. Hispanic or Latino residents account for 2.9%. The Hispanic or Latino population (2.9%) is well below the state average of 7.3%.

Education

7.4% of residents aged 25 and older hold a bachelor's degree or higher. This is 77% lower than the state rate of 31.4%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 89.5%.

Data Sources & Methodology

All demographic data for Waterville, Iowa is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Iowa state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,017 Census-designated places in Iowa. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.