Marblemount, Washington Demographics & Population 2026

A note before these figures: with a population of 291, Marblemount'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

Marblemount is a small community located in Washington, within Skagit County. The total population is 291. It ranks as the 531st most populous out of 628 Census-designated places in Washington.

Age Demographics

The median age in Marblemount is 60.1 years. This is 57% higher than the state median of 38.3 years. Only 6.9% of residents are under 18, indicating fewer families with children.

Economy, Income & Housing

The median household income in Marblemount is $100,458. This is 2% higher than the state median of $98,141. It is also 24% higher than the national median of $80,734. The ACS records no residents below the poverty line in Marblemount. 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 Marblemount, which reflects the size of the sample rather than a labor market without joblessness. The median home value is $296,100. Housing costs are 48% lower than the state median of $564,600. With a home-value-to-income ratio of just 2.9x, Marblemount is one of the most affordable housing markets in the area. 95.6% of occupied housing units are owner-occupied. This homeownership rate is 50% higher than the state average of 63.8%.

Race & Ethnicity

Marblemount has a predominantly White (non-Hispanic) population, comprising 90.4% of all residents. Hispanic or Latino residents account for 8.9%.

Education

16.0% of residents aged 25 and older hold a bachelor's degree or higher. This is 60% lower than the state rate of 39.6%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 86.0%.

Data Sources & Methodology

All demographic data for Marblemount, 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.