Year-Round Living on the Other Casco Bay Islands: Five Populations, One Ferry System

Five Islands, Five Very Different Year-Round Populations

Start with the raw numbers, because they vary more than a single "Casco Bay island life" description can capture. Long Island had 234 year-round residents at the 2020 Census (225 registered voters as of March 2025), with a summer population that swells to roughly 800 to 1,000. Chebeague Island, the largest of these five, had 396 year-round residents at the 2020 Census, up 16% from 2010; Casco Bay Lines' own island page separately cites "over 360 year-round people and more than 1,600 summer residents" -- a close but not identical figure to the Census count, and both numbers are stated here rather than picked over the other. Cliff Island had roughly 60 year-round residents as of the 2000 Census, swelling to around 200 in summer.

Great Diamond Island and Little Diamond Island are where the numbers get genuinely uncertain. Great Diamond had 77 year-round residents at the 2000 Census -- the most recent figure independently confirmed via Wikipedia -- but a commercial demographics aggregator (Point2Homes, whose methodology and vintage were not independently confirmed) shows a much smaller current snapshot: 12 residents, 6 occupied households, median age 71.5. That gap is stated here as an open discrepancy, not resolved one way or the other. Little Diamond Island is smaller still: 5 year-round residents at the 2000 Census, a figure explicitly tied to the fact that the island's water supply is shut off in winter, limiting who can actually live there permanently. The same demographics aggregator shows an even smaller current snapshot for Little Diamond -- 2 residents, 1 occupied household out of just 3 total housing units, two-thirds of them vacant. Little Diamond functions today as a mostly private, seasonal-cottage enclave rather than a year-round neighborhood, and that should be stated honestly rather than dressed up.

There is also a genuine, unresolved tension worth naming rather than papering over: Casco Bay Lines' own island page describes Cliff Island as "the smallest year-round inhabited island in Casco Bay," even though Little Diamond's 2000-Census and current-snapshot population figures are both smaller than Cliff Island's. The likely explanation is that Little Diamond functions as a private seasonal retreat rather than an organized year-round community, while Cliff Island -- despite its small numbers -- has a genuine, organized civic and school life. This page states both facts rather than declaring one island definitively "smaller" than the other.

Two Towns, Three Portland Neighborhoods: Governance Shapes Daily Life

Municipal status is not a background detail on these islands -- it determines who runs the school, who sets the tax rate, and who a resident calls with a town problem. Long Island seceded from the City of Portland on July 1, 1993, becoming its own incorporated town after Portland's 1990 property-tax revaluation sharply raised taxes on the island relative to the services residents felt they received. Chebeague Island seceded from the town of Cumberland on July 1, 2007, after 184 years as part of that town, authorized by the Maine Legislature through a specific public law (PS Law, Chapter 47) following an April 5, 2006 statewide vote (Maine Senate 31-3, House 131-1). Chebeague's secession had a different trigger than Long Island's tax dispute: the central motivator was protecting the island's own small elementary school amid Cumberland-district downsizing pressure.

Great Diamond Island, Little Diamond Island, and Cliff Island have no secession story at all -- they have always been City of Portland neighborhoods, governed and taxed the same way as any other Portland neighborhood. That puts Long Island and Chebeague residents in a genuinely different civic position: their own town office, their own assessor, their own local elections, rather than being one neighborhood inside a much larger city government. Peaks Island is also a Portland neighborhood, with its own separate governance story covered on this site's dedicated Peaks Island pages; it is mentioned here only as context, not restated.

Life by Ferry Schedule: Groceries, Mail, Medical Care, and School

On all five islands, year-round life is structured around the ferry, not the other way around. Casco Bay Lines serves all five: a Diamond Cove stop for Great Diamond Island, a stop for Little Diamond, wharves on Long Island and Chebeague Island (Chandler's Cove), and the longest run of the group to Cliff Island -- commonly cited at roughly 60 to 120 minutes one-way depending on route and freight stops, with five daily round trips operating year-round. Long Island also has a reservation-only vehicle car ferry with no fixed schedule, and Cliff Island's freight barge ramp, added in 2008, supports the deliveries a year-round household actually needs -- heating fuel, building materials, and everything else too heavy or too large for a passenger boat.

Chebeague Island has a genuinely distinct, two-operator setup unlike the other four: the Chebeague Transportation Company (CTC) runs a short, roughly 15-minute passenger run from Cousins Island in Yarmouth to the island's Stone Wharf, plus a 43-foot vehicle and freight barge (April through November, by reservation), while Casco Bay Lines separately runs a longer, roughly 60-to-90-minute mail-boat route from downtown Portland to Chandler's Cove. That gives Chebeague residents a faster mainland option than any of the other four islands, alongside the standard Portland route the rest of the group depends on.

School access is the clearest example of how real this ferry dependency is. Chebeague Island and Cliff Island each maintain their own tiny on-island school: Chebeague's is a two-room schoolhouse serving pre-K through 5th grade, and Cliff Island's is a one-room school serving the same grade range, with roughly 6 students per a 2020 Island Institute profile -- a figure that may well have changed since and should be re-verified before being treated as current. On both islands, students in 6th grade and above commute daily, by ferry, to mainland Portland-area schools. Long Island maintains its own Long Island School, though its specific grade range was not independently confirmed here. Great Diamond and Little Diamond, given their tiny and heavily seasonal populations, were not found to have any dedicated on-island school at all. Protecting the on-island elementary school was explicitly cited as the primary motivator behind Chebeague's 2007 secession from Cumberland -- a genuine example of how ferry-and-school logistics can reshape a town's own government, not just a family's daily schedule.

What Ferry-Dependent Life Costs Right Now: A Live 2026 Fare Fight

Every one of these five islands' year-round costs are directly affected by a genuine, dated 2026 dispute. Casco Bay Lines (operated by the Casco Bay Island Transit District) proposed raising peak-season round-trip adult passenger fares from $14 to $17 -- a 21% increase -- with 30-day passes rising from $48 to $51 and off-peak daily fares from $7.20 to $8, citing rising fuel, labor, vessel-maintenance, insurance, and regulatory costs. It was the second passenger fare increase in three years, following a 2024 hike (the first in 15 years) and a separate 2025 vehicle-fare increase. Hundreds of island residents filed a formal petition citing affordability concerns and improper public notice, and Maine's Office of the Public Advocate supported a state review, noting that "repeated fare increases over the past three years have placed a growing financial burden on low- and moderate-income island households." On June 16, 2026, the Maine Public Utilities Commission unanimously voted to open a full, formal adjudicatory investigation into both the financial justification for the increases and the rate-setting process itself; the new fares remained in effect for the 2026 summer season while that investigation proceeded, with the PUC retaining authority to modify or reverse them.

Separately, Casco Bay Lines' own current rates page lists a $16.00 peak-season (April 18 through October 12, 2026) round-trip adult fare (child/senior/disabled $8.00) and an $8.00 off-peak-season (October 13, 2026 through April 16, 2027) round-trip adult fare (child/senior/disabled $4.00) -- flat rates that apply identically across all seven served stops (Peaks, Little Diamond, Great Diamond, Diamond Cove, Long, Chebeague, Cliff), meaning the roughly two-hour round trip to Cliff Island costs the same as the short hop to Peaks Island. That $16 figure does not exactly match the $17 figure discussed in the April 2026 proposal coverage -- this page treats the carrier's own current rates page as the more current figure but does not claim either number as settled; verify directly with Casco Bay Lines before relying on either one. For a year-round resident on any of these islands, a fare increase is not a travel-cost inconvenience -- it is the cost of every grocery run, medical appointment, and mail pickup, on top of the ferry's own schedule constraints.

The Other Real Cost: A Documented Island Housing Shortage

A July 2025 Portland Press Herald investigation into housing shortages across Maine's 15 unbridged islands -- explicitly naming Chebeague, Long Island, Peaks Island, and Cliff Island among the Casco Bay islands examined -- found a median island resident age of 56 versus 44 statewide, housing costs driven up by wealthy outside buyers converting year-round homes to seasonal use, island construction costs roughly 30% higher than mainland costs due to barge transport and infrastructure needs, and a land supply further constrained by conservation easements. That is the structural version of the population numbers above: a shrinking, aging year-round base competing with a much larger seasonal-ownership market for a limited and expensive supply of buildable, deliverable housing.

Solutions being tried include modular home construction, explicitly named on Chebeague Island, Long Island, and Vinalhaven, and converting single-family homes into multi-unit rentals, named on Cliff Island and Isle au Haut. MaineHousing's dedicated Affordable Housing Initiative for Maine Islands has funded 49 units across 10 islands, with grants of up to $840,000 per project. Chebeague Island has the clearest documented example of this work: the Chebeague Island Community Association (CICA) built a modular duplex at 43 School House Road with a $350,000 MaineHousing grant, installed in May 2012 and occupied by two island families by that fall; ran a 2013-2014 rent-with-option-to-purchase house at 226 South Road; and built a second modular duplex at 553 South Road, on land donated by Stacie and Toby Webb, built with Dirigo Homes and installed in May 2025, with tenants expected to move in during fall 2026. No comparably specific, current civic housing story unique to Great Diamond Island or Little Diamond Island was found -- both islands' small, seasonal populations appear to generate less standalone press coverage than Chebeague, Long Island, or Cliff Island.

What This Means Before You Decide

Put together, honestly: there is no single "year-round life" on these five islands, and this page will not pretend there is. Chebeague Island, with its own elementary school, its own two-ferry-operator access, and the largest year-round population of the five, is the closest thing to a full-service year-round community here. Long Island has its own town government and its own school, with a population in the low hundreds. Cliff Island has a real, organized civic and school life despite a small, roughly-60-person year-round base and entirely unpaved roads. Great Diamond and Little Diamond are the thin end of this range -- small, seasonal-leaning communities where population figures genuinely conflict between sources and no dedicated school was found.

What all five genuinely share is that daily life runs by ferry schedule, not by road, and that the cost and reliability of that ferry system is a live, unresolved 2026 story -- a Maine PUC investigation into Casco Bay Lines' fare increases -- alongside a documented, multi-year island housing affordability crisis that is reshaping who can actually afford to live here year-round. Before making any move to any of these islands, ride the actual ferry route and schedule you would depend on, verify current fares directly with Casco Bay Lines (and, for Chebeague, the Chebeague Transportation Company), contact the relevant town office (Long Island, Chebeague Island) or the City of Portland (Great Diamond, Little Diamond, Cliff Island) about schools and services, and talk to current year-round residents about what a real winter here is actually like. Nothing on this page is legal, financial, or relocation advice.