San Juan County

San Juan County sits at a median home price of $887,832 with a cap rate of effectively zero and a cash-on-cash return of zero, which tells you almost everything you need to know before running a single spreadsheet line. The gross rent-to-price ratio isn't listed in the provided data, and the cash flow score confirms what the price level implies: this is not a market where you buy, rent, and cover your mortgage. The affordability index of 5 out of 100 places it among the least accessible markets in Washington state, and its state rank of 32nd out of 39 counties underscores that. Home prices are effectively flat, down 0.5% year-over-year, so you're not getting a momentum appreciation story either, at least not right now. The appreciation score of 48 is middling, and the stability score of 50 is unremarkable. On the cash-flow-versus-appreciation spectrum, San Juan lands in an uncomfortable middle zone: too expensive to cash flow, not appreciating fast enough to justify the price as a pure growth bet.

The investor profile this market suits is narrow. A cash-flow buyer has no business here. The numbers produce a zero cash flow estimate at a $887,832 purchase price, $177,566 down, and a 6.85% interest rate. A value-add operator faces the same math: you can force appreciation through renovations, but when your basis is already near $900,000 and your rent ceiling is constrained by a thin year-round renter pool on an island archipelago with roughly 18,000 permanent residents, the upside is limited relative to the capital required. The only investor who can make a rational argument for San Juan County is a high-net-worth buyer who wants a vacation-rental or short-term rental play, using the asset as a lifestyle hedge that also throws off some gross revenue, not a buyer dependent on net operating income to service debt. Even that strategy carries regulatory risk inherent to small island communities, which is discussed below.

No economic anchors or employer data were provided for this county, so the underlying demand drivers for long-term rentals are difficult to assess with precision. What the data does reflect is a population of 18,001, a figure that is small enough to create genuine concentration risk for any landlord. A market this size means that vacancy in even a handful of units represents a meaningful percentage of the available rental pool, and tenant turnover is more disruptive when the replacement tenant supply is thin. Year-round demand is structurally limited by the county's geography and the cost of living for working-class and middle-income households at this price level.

On carry costs, the combined monthly tax and insurance figure comes to $880, using a state-average effective property tax rate of 0.98% and an insurance rate of 0.21%, per Tax Foundation 2024 data. The tax rate is flagged as normal, so it doesn't compound the pain the way a 1.5%-plus rate would in a high-tax state, but $8,701 in annual property taxes and $1,864 in annual insurance on a property where net cash flow is already zero means that $880 per month is leaving before you account for maintenance, vacancy, or management. That's a material drag, not a rounding error. Actual county and township rates may differ from the state-average estimate, so verify the specific parcel's assessed value and levy rate before closing.

The concentration risk here is real and multi-layered. An 18,001-person permanent population on a ferry-dependent island cluster creates thin liquidity on both the buy and sell side. If you need to exit, your buyer pool is small and the asset is not easily repositioned. Short-term rental regulation is a legitimate concern in small island communities nationwide, and while no specific local ordinance data was provided, any investor underwriting a vacation-rental model should verify current and proposed STR rules with San Juan County directly before committing capital. Demographic concentration in a small, high-cost, amenity-driven market also means that any softening in second-home demand or remote-work migration flows can move prices meaningfully given the low transaction volume.

Comparing San Juan to its neighbors makes the picture starker. Island County prices at $623,534 with a rent-to-price ratio of 0.03879 and an overall score of 39. Whatcom County prices at $600,648 with a ratio of 0.04031 and an overall score of 40. Chelan County prices at $526,792 with a ratio of 0.03979 and an overall score of 40. Even King County, at $841,149, produces a rent-to-price ratio of 0.03235 and scores 34 overall, which is still marginally better than San Juan's zero cash flow result. Every single neighboring county in this dataset outscores San Juan overall and offers meaningfully better rent-to-price economics. An investor choosing San Juan over Whatcom or Island County is paying a roughly 30-40% price premium for worse income metrics and a smaller tenant pool. The only rational reason to choose San Juan over any of these alternatives is a specific thesis about the archipelago's long-term scarcity value, a lifestyle component to ownership, or access to the short-term rental market with eyes open to the regulatory and seasonal risks that come with it.