Buying in San Francisco County, California

San Francisco County at a glance

San Francisco County is one of 58 counties and county-equivalents in California. Its county seat is San Francisco. Its 2024 Census Bureau population estimate is 827,526 across 47 square miles of land — about 17,644 people per square mile. In the FBI's 2024 reported-crime file, agencies here reported 37,030 offenses — 44.75 per 1,000 residents; the breakdown is below.

Records to check before you buy in San Francisco County

• Property record card — the San Francisco 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 San Francisco — start there for office locations and the parcel search.
• Deeds & liens — the San Francisco 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 Francisco County is the primary county for 28 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 Francisco County reported 37,030 offenses — 44.75 per 1,000 residents; the largest single category was larceny-theft (21,458). The crime section below sets that beside the California county median.
• Registry check. Run the address through California Megan's Law Website (California Department of Justice) and note the counts within a mile — then check again the week you close.
• Permits & code history — the San Francisco 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 San Francisco.
• 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: California.

Reported crime in San Francisco County — FBI 2024

Reported crime in San Francisco County in 2024 was overwhelmingly property crime: agencies logged 37,030 offenses, of which 32,086 were property offenses and 4,944 violent. The total rate is 44.75 per 1,000 residents (violent 597.4, property 3877.3 per 100,000).

Inside California, the median county in the same file recorded a violent-crime rate of 458 per 100,000 and a property-crime rate of 1,315 per 100,000 (medians computed from the FBI 2024 county file across 58 counties).

The largest reported categories were larceny-theft (21,458), motor vehicle theft (5,464) and burglary (5,164).

Coverage: 7 of 7 law-enforcement agencies assigned to this county reported at least one month of 2024 offense data to the FBI; 5 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).

ZIP guides in San Francisco County

Registry counts and county crime records for the 25 ZIP codes whose primary county is San Francisco County.

The California rules that apply in San Francisco County

Traps researched for California buyers: Proposition 13 sale reset and supplemental tax bill; Natural Hazard Disclosure is separate from the condition disclosure.

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

More California counties

All California counties · California buyer guide