Union, Washington Demographics & Population 2026

A note before these figures: with a population of 457, Union'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

Union is a small community located in Washington, within Mason County. The total population is 457. It ranks as the 485th most populous out of 628 Census-designated places in Washington.

Age Demographics

The median age in Union is 71.7 years. This is 87% higher than the state median of 38.3 years. Only 5.7% of residents are under 18, indicating fewer families with children. 23.6% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.

Economy, Income & Housing

The ACS records no residents below the poverty line in Union. In a community this small the estimate rests on very few survey responses, so it should be read as an absence of measurement rather than a measured absence of poverty. The survey records no unemployed residents in Union, which reflects the size of the sample rather than a labor market without joblessness. The median home value is $375,400. Housing costs are 34% lower than the state median of $564,600. 91.5% of occupied housing units are owner-occupied. This homeownership rate is 43% higher than the state average of 63.8%.

Race & Ethnicity

Every resident counted in Union was recorded as White (non-Hispanic). A figure of exactly 100.0% reflects a survey sample too small to capture the community's full composition rather than a precise measurement.

Education

37.5% of residents aged 25 and older hold a bachelor's degree or higher. This is 5% lower than the state rate of 39.6%. Nationally, 35.7% of adults hold at least a bachelor's degree. No surveyed resident aged 25 or older reported leaving school before earning a high school diploma, though a rate of exactly 100% reflects the limits of a small sample. Notably, 16.3% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Data Sources & Methodology

All demographic data for Union, Washington 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 Washington state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 628 Census-designated places in Washington. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.