Lake Seneca, Ohio Demographics & Population 2026

A note before these figures: with a population of 532, Lake Seneca'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

Lake Seneca is a small community located in Ohio, within Williams County. The total population is 532. It ranks as the 870th most populous out of 1,264 Census-designated places in Ohio.

Age Demographics

The median age in Lake Seneca is 52.7 years. This is 33% higher than the state median of 39.7 years. Only 13.4% of residents are under 18, indicating fewer families with children. 19.7% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.

Economy, Income & Housing

The median household income in Lake Seneca is $86,202. This is 21% higher than the state median of $71,389. It is also 7% higher than the national median of $80,734. The poverty rate stands at 6.2%. This is 53% lower than the state poverty rate of 13.3%. The survey records no unemployed residents in Lake Seneca, which reflects the size of the sample rather than a labor market without joblessness. The median home value is $193,200. Housing costs are 10% lower than the state median of $214,800. With a home-value-to-income ratio of just 2.2x, Lake Seneca is one of the most affordable housing markets in the area. 96.7% of occupied housing units are owner-occupied. This homeownership rate is 44% higher than the state average of 67.2%.

Race & Ethnicity

Lake Seneca has a predominantly White (non-Hispanic) population, comprising 97.7% of all residents. Hispanic or Latino residents account for 2.3%. The Hispanic or Latino population (2.3%) is well below the state average of 4.8%.

Education

12.6% of residents aged 25 and older hold a bachelor's degree or higher. This is 60% lower than the state rate of 31.5%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 98.2%.

Data Sources & Methodology

All demographic data for Lake Seneca, Ohio 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 Ohio state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,264 Census-designated places in Ohio. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.