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Community
Health
Needs
Assessment
2025

Assessing health challenges and community strengths to build a healthier future for Martha’s Vineyard & Dukes County

Island Health Care's 2025 Community Health Needs Assessment (CHNA) provides a comprehensive analysis of health challenges, disparities, and community strengths across Martha's Vineyard. The assessment gathered input from 1,021+ community members through surveys, focus groups, and key informant interviews to identify priority health needs and guide our strategic planning.

This page contains a summary of key findings. For full methodology, citations, and complete data, see the full CHNA report:​

INTRODUCTION
Listening to the Community: Understanding Dukes County's Health Needs & Priorities

Dukes County faces persistent barriers to care. The county is federally designated as a Health Professional Shortage Area for primary care and recognized as a Medically Underserved Population. Both Island Health Care and the Wampanoag Health Service have shortage designations for primary care, dental care, and mental health—reaffirmed in September 2025. These designations underscore an urgent need: more providers, expanded infrastructure, and strategic interventions to ensure every resident can access the care they need.

This assessment examines health indicators, service gaps, provider shortages, and community priorities across Martha’s Vineyard. It represents the Island’s first collaborative community health assessment, completed jointly by Island Health Care and Martha’s Vineyard Hospital. Both organizations share a belief that as health care leaders, we have a responsibility not only to provide quality clinical services, but to address the social and economic factors—housing instability, food insecurity, transportation barriers, seasonal employment—that shape health outcomes.

The findings come from three sources: secondary data from federal, state, and local agencies; 10 focus groups and 5 interviews with 103 community leaders and residents representing vulnerable populations; and a community survey conducted between April and July 2025 that gathered responses from 1,021 Island residents. The survey was available in English and Portuguese and promoted across the Island to ensure broad participation, especially from those most affected by health disparities.

This report translates what we heard into action—informing solutions that promote equitable access and improved health outcomes for all residents of Dukes County.

Survey Respondent Demographics

COMMUNITY DEMOGRAPHICS & ENVIRONMENTAL PROFILE
The Island Context: Where We Live & Who We Serve

Key Findings

Geography

More than 99 percent of Dukes County’s population lives on Martha’s Vineyard, a geographically isolated island situated seven miles off the southern coast of Massachusetts. The county comprises seven distinct municipalities—Tisbury, West Tisbury, Edgartown, Oak Bluffs, Chilmark, Aquinnah, and Gosnold—each with its own cultural identity and governance structure. Despite scenic beauty and strong community bonds, the county faces significant challenges stemming from geographic isolation, seasonal population variability, and rural character.

Population

The year-round population grew 27% in the past decade, from 16,535 in 2010 to 21,061 in 2024. But on any given summer day, the population can reach upwards of 94,000 people—roughly 4.5 times the year-round population—straining already stretched health care resources.

Dukes County is significantly older than state and national averages: 26% of residents are 65 or older (vs. 17% nationally, 18% statewide), with a median age of 50.7 compared to 40.1 statewide. This aging population drives increasing demand for chronic disease management and geriatric services.

Race, Ethnicity, Country of Origin

In the most recent American Community Survey, 82% of residents identified as White alone, 9% as two or more races, 3% as Black or African American, 3% as some other race, 1% as Asian, and 1% as American Indian or Alaska Native. Separately, 3% identified as Hispanic or Latino. Approximately 278 members of the Wampanoag Tribe of Gay Head (Aquinnah) live in the community, constituting about 1.5% of the county population.

The Island is home to a substantial and growing Brazilian community. By 2024, roughly a third of all babies born at Martha’s Vineyard Hospital were of Brazilian descent, and an estimated 40% of students in Island public schools spoke Portuguese as their first language at home. Nearly 50% of Island Health Care patients indicated they are best served in a language other than English, with 97% of IHC’s interpretation services provided in Portuguese or Brazilian Portuguese.

Climate Change

Climate change is already shaping daily life on Martha’s Vineyard. Temperatures in Massachusetts have risen nearly 3.5°F since the early 20th century, and sea level has risen approximately 11 inches between 1921 and 2020. The Island faces increasing risk from coastal flooding, storm surge, nor’easters, tropical storms, and hurricanes.

According to the CHNA survey, 41% of respondents reported that extreme weather at least occasionally disrupted their daily routines, with mental health (37%) and access to health care (35%) also frequently affected. Climate change will continue to exacerbate nearly every challenge outlined in this report—from heat-related illness to disrupted transportation, housing damage, food security threats, and ecosystem destabilization.

Income / Poverty

Economic pressures are severe. The median home price of $1,327,500 creates an affordability gap of $928,500—up 313% since 2012. At the average weekly wage, it takes 80.3 hours of work per week to pay for affordable housing, compared to 40.2 hours statewide. The county’s median annual household income is $102,348, though this ranges from $70,724 in Tisbury to $194,526 in West Tisbury.

About 5.4% of residents live in poverty—1,110 people total. Poverty rates vary by race and ethnicity, with higher rates among Black residents (8.7%), Asian residents (14.9%), and those identifying with two or more races (11.5%). Disparity is also evident in estimated town poverty rates, ranging from 2% in Aquinnah to 11% in Tisbury. The percentage of IHC patients with annual household income at or below 200% of the Federal Poverty Level was 53.57% in 2024.

Unemployment

The county experiences dramatic seasonal employment swings: unemployment drops below 3% in summer when tourism peaks, then more than doubles to 7-8% by winter when seasonal jobs disappear and year-round opportunities remain limited. For example, unemployment was 3.3% in July 2025 but 8.3% in January 2025. These sharp fluctuations create real consequences for residents who rely on seasonal work, often facing periods each year when income drops significantly, making it difficult to afford consistent health insurance coverage.

Industry

The Island’s workforce is concentrated in professional/scientific/management services (22.6%), education/health care/social assistance (20.2%), and construction (14.3%). The seasonal tourism economy drives much of this employment, with arts/entertainment/recreation/accommodation/food service representing 12.1% of jobs and showing a 4.3 percentage point increase since 2022.

Uninsured

According to 2024 estimates, 2.1% of Dukes County residents do not have health insurance (down from 6.5% in 2022). This rate is highest among residents ages 26 to 34 (8.2%), Black residents (3.9%), and residents identifying with more than two races (7.6%). Further, 14.3% of residents below 100% of the poverty threshold are uninsured—consistent with the national estimate but substantially exceeding the Massachusetts rate of 4.6%.

The percentage of IHC patients who are uninsured has increased steadily over time, rising from 12.73% in 2017 to 32.90% in 2025—a near tripling in eight years. This trend is expected to worsen as provisions of the One Big Beautiful Bill Act roll out between 2026 and 2028, with experts warning that hundreds of thousands of Massachusetts residents could lose MassHealth coverage due to new work requirements, six-month eligibility checks, and other policy changes.

KEY HEALTH INDICATORS FOR DUKES COUNTY
A Healthy Community with Stubborn Barriers & Unmet Needs

Key Findings

Overall Health Status

Dukes County residents enjoy relatively strong overall health. According to County Health Rankings, the county has the lowest mortality rate in Massachusetts and the second highest life expectancy. An overwhelming 81% of residents rated their health as good, very good, or excellent in the CHNA survey.
Despite these positive indicators, the county faces significant challenges. Higher-than-average rates of certain chronic conditions—including heart disease, hypertension, and depression—alongside persistent barriers to accessing care suggest that aggregate health outcomes mask important disparities and unmet needs.

Chronic Disease

Dukes County has higher prevalence rates for several chronic conditions compared to state averages. Adults with coronary heart disease: 6.3% (vs. 5.2% statewide). Adults with high blood pressure: 32.6% (vs. 30.6% statewide). Adults with high cholesterol: 35.2% (vs. 33.4% statewide). These conditions are among the nation’s leading drivers of illness, disability, death, and health care costs.

The county also shows elevated rates for chronic obstructive pulmonary disease (COPD) at 7.8% compared to 6.5% statewide, and chronic kidney disease at 3.7% compared to 2.9% statewide. Arthritis affects 30.7% of adults, exceeding the state rate of 27.9%.

Tick-Borne Disease

In 2025, the Dukes County/Nantucket rate of emergency department visits by patients diagnosed with tick-borne disease was 88.1 per 10,000—the highest rate in the state by nearly 500%. Barnstable County and Berkshire County are the next highest with rates of 14.56 and 14.89 per 10,000, respectively.

Positive lab tests for tick-borne diseases at Martha’s Vineyard Hospital rose by about 50% between 2019 and 2024. Alpha-gal syndrome testing has also surged: the hospital recorded only nine tests and two positive results in 2020, compared with 1,254 tests and 523 positive results in 2024.

Mental Health

In Dukes County, the crude occurrence rate for adults with depression is 23.4%, nearly equal to the Commonwealth’s rate of 23.8%. Between 2020 and 2023, depression rates in Dukes County increased by 4.7%, while the state rate increased by 0.5%.

Among respondents to the CHNA survey who reported needing non-emergency mental health care, 14% indicated that accessing these services was “very difficult,” while 37% said it was “somewhat difficult.” Only 35% reported it was “not at all difficult” to access mental health care when needed.

Substance Use

Alcohol is the leading substance use concern on Martha’s Vineyard. From July 2024 to June 2025, 87% of substance-related emergency room visits in the county were alcohol-related, compared with 80% statewide. In 2022, 23% of adults in Dukes County reported binge or heavy drinking, compared to 20% across Massachusetts.

Dukes County trends opposite the state for opioid-related deaths. While the age-adjusted opioid-related death rate for Massachusetts declined from 34.7 per 100,000 in 2022 to 20 per 100,000 in 2024, Dukes County’s crude rate increased from 24.3 per 100,000 in 2021 to 29.1 per 100,000 in 2023. Since 2022, 100% of overdose deaths in Dukes County have involved fentanyl.

Suicide

Dukes County stands out with the highest crude suicide rate in the state—19 per 100,000—which is approximately 138% higher than the Massachusetts rate of 8 per 100,000. This elevated rate has persisted over time, ranging from 14.6 to 19.0 per 100,000 between 2019 and 2023, consistently exceeding state averages.

Cancer

Dukes County’s age-adjusted incidence rate for all cancers combined is 422.8 per 100,000, slightly lower than the state rate of 471.3 per 100,000. The county also has a lower age-adjusted death rate from all cancers (113.9 per 100,000) compared to the state (137.6 per 100,000). However, the county shows higher incidence rates for melanoma (35.9 vs. 20.0 statewide) and thyroid cancer (20.6 vs. 15.4 statewide).

HIGHEST PRIORITY ISSUES ACCORDING TO THE COMMUNITY
Community Priorities: Housing, Food, Jobs, and Access

Key Findings

Overall Health Status

Dukes County residents enjoy relatively strong overall health. According to County Health Rankings, the county has the lowest mortality rate in Massachusetts and the second highest life expectancy. An overwhelming 81% of residents rated their health as good, very good, or excellent in the CHNA survey.
Despite these positive indicators, the county faces significant challenges. Higher-than-average rates of certain chronic conditions—including heart disease, hypertension, and depression—alongside persistent barriers to accessing care suggest that aggregate health outcomes mask important disparities and unmet needs.

Chronic Disease

Dukes County has higher prevalence rates for several chronic conditions compared to state averages. Adults with coronary heart disease: 6.3% (vs. 5.2% statewide). Adults with high blood pressure: 32.6% (vs. 30.6% statewide). Adults with high cholesterol: 35.2% (vs. 33.4% statewide). These conditions are among the nation’s leading drivers of illness, disability, death, and health care costs.

The county also shows elevated rates for chronic obstructive pulmonary disease (COPD) at 7.8% compared to 6.5% statewide, and chronic kidney disease at 3.7% compared to 2.9% statewide. Arthritis affects 30.7% of adults, exceeding the state rate of 27.9%.

Tick-Borne Disease

In 2025, the Dukes County/Nantucket rate of emergency department visits by patients diagnosed with tick-borne disease was 88.1 per 10,000—the highest rate in the state by nearly 500%. Barnstable County and Berkshire County are the next highest with rates of 14.56 and 14.89 per 10,000, respectively.

Positive lab tests for tick-borne diseases at Martha’s Vineyard Hospital rose by about 50% between 2019 and 2024. Alpha-gal syndrome testing has also surged: the hospital recorded only nine tests and two positive results in 2020, compared with 1,254 tests and 523 positive results in 2024.

Mental Health

In Dukes County, the crude occurrence rate for adults with depression is 23.4%, nearly equal to the Commonwealth’s rate of 23.8%. Between 2020 and 2023, depression rates in Dukes County increased by 4.7%, while the state rate increased by 0.5%.

Among respondents to the CHNA survey who reported needing non-emergency mental health care, 14% indicated that accessing these services was “very difficult,” while 37% said it was “somewhat difficult.” Only 35% reported it was “not at all difficult” to access mental health care when needed.

Substance Use

Alcohol is the leading substance use concern on Martha’s Vineyard. From July 2024 to June 2025, 87% of substance-related emergency room visits in the county were alcohol-related, compared with 80% statewide. In 2022, 23% of adults in Dukes County reported binge or heavy drinking, compared to 20% across Massachusetts.

Dukes County trends opposite the state for opioid-related deaths. While the age-adjusted opioid-related death rate for Massachusetts declined from 34.7 per 100,000 in 2022 to 20 per 100,000 in 2024, Dukes County’s crude rate increased from 24.3 per 100,000 in 2021 to 29.1 per 100,000 in 2023. Since 2022, 100% of overdose deaths in Dukes County have involved fentanyl.

Suicide

Dukes County stands out with the highest crude suicide rate in the state—19 per 100,000—which is approximately 138% higher than the Massachusetts rate of 8 per 100,000. This elevated rate has persisted over time, ranging from 14.6 to 19.0 per 100,000 between 2019 and 2023, consistently exceeding state averages.

Cancer

Dukes County’s age-adjusted incidence rate for all cancers combined is 422.8 per 100,000, slightly lower than the state rate of 471.3 per 100,000. The county also has a lower age-adjusted death rate from all cancers (113.9 per 100,000) compared to the state (137.6 per 100,000). However, the county shows higher incidence rates for melanoma (35.9 vs. 20.0 statewide) and thyroid cancer (20.6 vs. 15.4 statewide).