The Real Cost of Owning on Deer Isle / Stonington, ME
Before any dollar figure: this island holds two separate towns, the Town of Deer Isle and the Town of Stonington, each with its own property tax rate, its own assessing office, and its own housing stock — and neither one is the Stonington Borough in Connecticut covered elsewhere on this site. Reliable, current, address-level cost figures for either Maine town were not fully confirmed in this research pass, and this page says so directly rather than inventing a number. What follows is the honest picture this research did confirm: real, sourced facts about taxes, insurance, housing supply, and the island's genuine cost pressures, with every specific dollar figure attributed to its source and every gap named as a gap.
Two Tax Bills, Not One
Because this is two towns on one island, a buyer's property tax bill depends entirely on which side of the town line a property sits. A June 2025 Island Ad-Vantages report (Penobscot Bay Press) confirms that both the Town of Deer Isle and the Town of Stonington raised property taxes for that cycle, with officials in both towns attributing the increases to higher Community School District 13 and Hancock County budgets. This page does not state a specific current mil rate for either town, since the article's specific figures sit behind a subscription paywall that this research pass could not access — confirm the current rate directly with the Town of Deer Isle's or the Town of Stonington's own assessing office before budgeting a purchase.
The two towns' assessed values also differ meaningfully. Zillow's own home-value index puts Deer Isle (ZIP 04627) at roughly $415,101, up about 1.4% year over year, against Stonington (ZIP 04681) at roughly $508,686 — a real, sourced gap, not a rounding difference, and a reminder that "Deer Isle / Stonington" pricing should never be quoted as one blended number.
Housing Supply Is the Real Cost Driver Right Now
The single most important cost fact on this island right now is not a tax rate — it is supply. A joint Deer Isle-Stonington interlocal housing task force report, covered by the Bangor Daily News in December 2025, found that roughly 46% of homes in Deer Isle and 42% of homes in Stonington sit vacant or seasonal-only during the off-season, and that short-term rentals across the island grew from 232 units in 2022 to 246 in 2025. That combination — a large seasonal-only housing stock plus a growing short-term-rental sector — is a genuine, documented driver of scarcity and price pressure for anyone trying to buy or rent year-round, not a general "coastal Maine is expensive" gloss.
The same report found that roughly 25% of the island's population was reported earning under $25,000 annually, and that essential workers — fishermen, caregivers, retail and hospitality staff — commonly earn under $45,000, a real mismatch against home values that have risen sharply. On the response side, local nonprofits, including Island Workforce Housing, had roughly 45 new housing units expected by the end of 2026, alongside a redevelopment project at the former Island Nursing Home site — a real but partial and still-unfolding response, not a solved problem.
Insurance and Storm-Hardening Costs
This page does not state a specific current homeowners or flood insurance premium for either town, since premiums vary by exact parcel, elevation, construction, and carrier, and none was independently confirmed this research pass. What is confirmed is that storm exposure here is real and recent: the January 10, 2024 coastal storm caused roughly $200,000 in town-property damage in Stonington alone, per the town's own town manager, alongside real, itemized private-property damage (see this site's storm-prep-costs and hurricane-risk pages for details). A buyer evaluating any waterfront or near-waterfront parcel on this island should get a current, address-specific insurance quote rather than assume a generic coastal-Maine rate applies.
What This Means Before You Budget
Put together, honestly: the real cost of owning here starts with knowing which town a property sits in, since Deer Isle and Stonington run separate tax rates and separate assessed-value profiles. Layered on top of that is a genuine, currently unresolved workforce-housing shortage that is pushing both vacancy and short-term-rental numbers in ways that affect price and availability for everyone, not just seasonal buyers. This page has deliberately not invented a single current tax rate, insurance premium, or median price for either town, because none was independently confirmed to a specific, current, reliable figure.
Before making any purchase decision, confirm the current mil rate directly with the Town of Deer Isle's or the Town of Stonington's own assessing office, get a current insurance quote for the specific parcel from a Maine-licensed agent, and talk to a locally licensed real estate agent about current inventory and pricing in the specific town and village you're considering. Nothing on this page is legal, tax, or financial advice.
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Get a Free Agent Referral →Independent research. No ads. No sponsored listings. Facts used: a June 2025 Penobscot Bay Press/Island Ad-Vantages report confirming property tax increases in both the Town of Deer Isle and the Town of Stonington for the 2025 cycle (specific mil rates not accessible behind that article's paywall this research pass); Zillow's own home-value index for Deer Isle (04627, roughly $415,101, +1.4% YoY) and Stonington (04681, roughly $508,686); a December 2025 Bangor Daily News report on a joint Deer Isle-Stonington interlocal housing task force, confirming 46% seasonal vacancy in Deer Isle, 42% in Stonington, short-term rental growth from 232 units (2022) to 246 (2025), and workforce income figures; and Portland Press Herald reporting on the January 2024 storm's roughly $200,000 in Stonington town-property damage. This page does not state a specific current property tax mil rate for either town, a specific current insurance premium, or a specific current median home sale price, since none of those were independently confirmed to a reliable current figure this research pass. Confirm current tax rates directly with each town's own assessing office, current insurance costs with a Maine-licensed agent, and current pricing and inventory with a locally licensed real estate agent before making a purchase decision. Nothing on this page is legal, tax, or financial advice.