Buying in San Juan County, Washington

San Juan County at a glance

San Juan County is one of 39 counties and county-equivalents in Washington. Its county seat is Friday Harbor. County government publishes its offices and parcel tools online. Official county website. Its 2024 Census Bureau population estimate is 18,668 across 174 square miles of land — about 107 people per square mile. In the FBI's 2024 reported-crime file, agencies here reported 111 offenses — 5.95 per 1,000 residents; the breakdown is below.

Records to check before you buy in San Juan County

• Property record card — the San Juan County assessor / appraisal office. Pull the parcel's assessed-value history, exemption status, and last sale. This is the file your future tax bill is calculated from, and it shows whether the current owner is enjoying exemptions you will not inherit. County government sits in Friday Harbor; the official county website is the reliable route to the parcel search and the office directory.
• Deeds & liens — the San Juan County recorder / land-records office. Read the deed chain, open liens, easements, and plat maps — the file a listing never mentions.
• Official flood determination. Check the exact parcel on FEMA's National Flood Hazard Layer — not the listing site's licensed model. Zone boundaries cut through streets; the house next door can be in a different zone. San Juan County is the primary county for 9 ZIP codes in the Census Bureau's ZIP-to-county crosswalk — and zone lines ignore every one of them.
• The county's reported-crime record. In the FBI's 2024 file, agencies in San Juan County reported 111 offenses — 5.95 per 1,000 residents; the largest single category was larceny-theft (78). The crime section below sets that beside the Washington county median.
• Registry check. Run the address through Washington Sex Offender Public Registry (WASOR) (Washington Association of Sheriffs and Police Chiefs (WASPC)) and note the counts within a mile — then check again the week you close.
• Permits & code history — the San Juan building department. Open permits, expired permits, and code cases tell you whether the renovation in the photos was ever inspected. County permitting is run out of Friday Harbor.
• School assignment — the district office, not the listing. Only the district's own boundary lookup confirms which school an address is actually zoned for.

County list, land area and population: U.S. Census Bureau (population: 2024 PEP estimate). County seat and official website: Wikidata (CC0), checked 2026-11-04. Flood determinations: FEMA. Registry: Washington.

Reported crime in San Juan County — FBI 2024

Reported crime in San Juan County in 2024 was overwhelmingly property crime: agencies logged 111 offenses, of which 103 were property offenses and 8 violent. The total rate is 5.95 per 1,000 residents (violent 42.9, property 551.7 per 100,000).

Inside Washington, the median county in the same file recorded a violent-crime rate of 221 per 100,000 and a property-crime rate of 1,443 per 100,000 (medians computed from the FBI 2024 county file across 39 counties).

The largest reported categories were larceny-theft (78), burglary (20) and aggravated assault (6).

Coverage: 1 of 1 law-enforcement agencies assigned to this county reported at least one month of 2024 offense data to the FBI; 1 reported all 12 months. Counts are reported offenses only (FBI Return A / Arson master files), assigned whole to each agency's primary county; they are not adjusted for non-reporting agencies.

These are offenses reported to law enforcement — not convictions, and not a verdict on any street or address. A CurbFacts report pairs this county record with the ZIP-level picture for the specific address you are buying.

Source: FBI Crime Data Explorer, UCR Return A + Arson master files, data year 2024 (pulled 2026-11-04).

The Washington rules that apply in San Juan County

Traps researched for Washington buyers: Form 17 has real exemptions; The public registry omits most Level I offenders.

Read the full Washington guide — disclosure standard, tax math, registry and flood

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