Cousins Island, Maine Demographics & Population 2026

A note before these figures: with a population of 658, Cousins Island'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

Cousins Island is a small community located in Maine, within Cumberland County. The total population is 658. It ranks as the 124th most populous out of 155 Census-designated places in Maine.

Age Demographics

The median age in Cousins Island is 58.1 years. This is 30% higher than the state median of 44.8 years. Only 13.2% of residents are under 18, indicating fewer families with children. 16.9% 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 Cousins Island is $180,625. This is 142% higher than the state median of $74,733. It is also 124% higher than the national median of $80,734. The poverty rate stands at 2.7%. This is 75% lower than the state poverty rate of 10.8%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The unemployment rate is 5.5%. This is 45% higher than the state rate of 3.8%. The median home value is $658,000. Housing costs are 122% higher than the state median of $296,600. The home-value-to-income ratio is 3.6x. 96.7% of occupied housing units are owner-occupied. This homeownership rate is 30% higher than the state average of 74.3%.

Race & Ethnicity

Cousins Island has a predominantly White (non-Hispanic) population, comprising 94.4% of all residents. Hispanic or Latino residents account for 4.1%. The Hispanic or Latino population is significantly higher than the state average (4.1% vs 2.2%).

Education

61.7% of residents aged 25 and older hold a bachelor's degree or higher. This places Cousins Island in the top 10% of all cities in the state for educational attainment. This is 71% higher than the state rate of 36.2%. 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, 35.3% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Data Sources & Methodology

All demographic data for Cousins Island, Maine 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 Maine state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 155 Census-designated places in Maine. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.