States › California › San Mateo County › ZIP 94403
ZIP code 94403, San Mateo County, California
National Flood Insurance Program claims and payouts recorded for this ZIP code, with county context.
NCEI notes that Storm Data is compiled from a variety of sources including the National Weather Service, other federal, state and local agencies, the media and the public; that property and crop damage figures are estimates; and that some events are recorded by NWS forecast zone rather than by county. FEMA notes that NFIP claim records are redacted and aggregated to protect the privacy of policyholders. NFIP claims as of 8 Sep 2026.
OpenFEMA lists 43 NFIP claims for ZIP 94403 (San Mateo County, California), with $334K paid on 23 claims since 1978.
That is 3.9% of the 1,110 claims recorded across San Mateo County. The average paid claim in the ZIP is $15K, lower than the county average of $28K and the California average of $21K.
At county level FEMA counts 3,346 residential flood policies in force, covering 1.8% of residential structures.
Compared with the county and state
| Measure | ZIP 94403 | San Mateo | California | US |
|---|---|---|---|---|
| Claims since 1978 | 43 | 1,110 | 53,563 | 2,680,429 |
| Share of claims paid | 53% | 64% | 66% | 78% |
| Average paid claim | $15K | $28K | $21K | $43K |
| Share of county claims | 3.9% | 100% | — | — |
| Repetitive-loss properties | 0 | 47 | 3,456 | — |
Claims by year of loss
| Decade | Claims | Paid |
|---|---|---|
| 1970s | 3 | $3,951 |
| 1980s | 11 | $83,927 |
| 1990s | 3 | $24,617 |
| 2000s | 7 | $4,199 |
| 2010s | 11 | $6,016 |
| 2020s | 8 | $211,253 |
| Year of loss | Claims | Paid claims | Amount paid | Average paid |
|---|---|---|---|---|
| 2023 | 2 | 1 | $11,193 | $11,193 |
| 2022 | 6 | 6 | $200,059 | $33,343 |
| 2017 | 1 | 1 | $2,881 | $2,881 |
| 2016 | 2 | 1 | $3,135 | $3,135 |
| 2015 | 1 | 0 | $0 | — |
| 2012 | 1 | 0 | $0 | — |
| 2011 | 2 | 0 | $0 | — |
| 2010 | 4 | 0 | $0 | — |
| 2009 | 1 | 0 | $0 | — |
| 2008 | 1 | 0 | $0 | — |
| 2006 | 2 | 1 | $3,349 | $3,349 |
| 2005 | 1 | 0 | $0 | — |
| 2003 | 1 | 0 | $0 | — |
| 2002 | 1 | 1 | $850 | $850 |
| 1998 | 2 | 1 | $22,199 | $22,199 |
| 1997 | 1 | 1 | $2,418 | $2,418 |
| 1986 | 2 | 2 | $28,541 | $14,270 |
| 1983 | 5 | 3 | $38,726 | $12,909 |
| 1982 | 3 | 1 | $13,558 | $13,558 |
| 1981 | 1 | 1 | $3,102 | $3,102 |
| 1979 | 2 | 2 | $3,027 | $1,513 |
| 1978 | 1 | 1 | $924 | $924 |
Claims are counted by year of loss as recorded in OpenFEMA's redacted NFIP claims file; amounts combine building, contents and increased-cost-of-compliance payments. ZIP codes in the file are the policyholder's reported ZIP.
County context: San Mateo County
San Mateo County has 178 weather events in the NCEI record since 1950 (19 in the last 12 months), 24 federal disaster declarations, and an overall National Risk Index rating of "Relatively High". Flood-type events recorded in the county: 98; hurricane-strength tracks within 50 miles: 0.
Hail: 9 · Tornado: 4 · Flood: 98 · Wind: 31 · Winter: 1 — full county page.
Questions and answers
How many flood insurance claims have been filed in ZIP 94403?
43 claims since 1978 in the OpenFEMA NFIP claims file, 23 of them with a payment.
How much has the NFIP paid out in ZIP 94403?
$334K across 23 paid claims (building, contents and increased-cost-of-compliance payments combined), about $15K per paid claim.
Which year had the most flood claims in 94403?
2022, with 6 claims and $200K paid.
What county is ZIP 94403 in?
Most claims in this ZIP carry the county code for San Mateo County, California; ZIP codes can cross county lines. The county page carries the storm record, declarations and risk index for the area.
Provenance
OpenFEMA NfipClaims v3 (as of 8 Sep 2026) and NfipMultipleLossProperties v1 (2 Aug 2026), aggregated by ZIP code and year of loss on this site; no property-level record is shown. County storm figures from NOAA NCEI through 30 Jun 2026. Built 1 Oct 2026. See the guide to redacted NFIP claims and the methodology.