Marine on St. Croix, Minnesota Demographics & Population 2026

A note before these figures: with a population of 740, Marine on St. Croix'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

Marine on St. Croix is a small community located in Minnesota, within Washington County. The total population is 740. It ranks as the 416th most populous out of 914 Census-designated places in Minnesota.

Age Demographics

The median age in Marine on St. Croix is 57.3 years. This is 48% higher than the state median of 38.8 years. 15.3% 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 Marine on St. Croix is $126,250. This is 42% higher than the state median of $89,062. It is also 56% higher than the national median of $80,734. The poverty rate stands at 2.8%. This is 69% lower than the state poverty rate of 9.3%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The survey records no unemployed residents in Marine on St. Croix, which reflects the size of the sample rather than a labor market without joblessness. The median home value is $470,100. Housing costs are 43% higher than the state median of $329,300. The home-value-to-income ratio is 3.7x. 94.4% of occupied housing units are owner-occupied. This homeownership rate is 31% higher than the state average of 72.2%.

Race & Ethnicity

Marine on St. Croix has a predominantly White (non-Hispanic) population, comprising 94.6% of all residents. Asian residents account for 2.0%. The Hispanic or Latino population (0.4%) is well below the state average of 6.4%. The Asian population (2.0%) is well below the state average of 5.1%.

Education

69.9% of residents aged 25 and older hold a bachelor's degree or higher. This places Marine on St. Croix in the top 10% of all cities in the state for educational attainment. This is 77% higher than the state rate of 39.4%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 99.1%. Notably, 33.0% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Data Sources & Methodology

All demographic data for Marine on St. Croix, Minnesota 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 Minnesota state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 914 Census-designated places in Minnesota. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.