ZIP 94027 · San Mateo County

Atherton, CA Homeowners Insurance

According to U.S. Treasury FIO 2022 filings, homeowners insurance in ZIP 94027, Atherton, California averages $7,901/yr.

25.8%
Loss ratio
1.07%
Nonrenewal rate
#6 of 1545
California rank
526
Policies

The verdict

ZIP 94027 (Atherton, CA) is #146 of 25,593 for homeowners premium and #8,950 of 21,752 for nonrenewal, per 2022 FIO filings. The two ranks do not match.

$7,901
Avg premium (2022)
#146
of 25,593 on premium
#8,950
of 21,752 on nonrenewal
99th
national percentile

Premium rank counts ZIPs with a reported average premium, highest first. Nonrenewal rank counts ZIPs with a reported nonrenewal rate, highest first. The two boards are different extracts.

According to U.S. Treasury Federal Insurance Office data. How we calculate the percentile and national comparison: methodology.

Insurance Livability Score

F
PlainInsure Livability Score
28/100
94027 - Atherton, CA

PlainInsure's own composite of Treasury FIO premium/market data and FEMA National Risk Index hazard data, each dimension percentile-ranked against the full national corpus. Not an official government score, and not a substitute for an actual insurance quote.

Affordability F
$7,901/yr
Avg premium, 1st cheapest nationally (Treasury FIO)
Market Stability D
0.01%
Nonrenewal rate -- insurers dropping coverage (Treasury FIO)
Disaster Risk F
99.2
County FEMA National Risk Index score
Community Resilience A+
97.6
County FEMA NRI community-resilience score

Where ZIP 94027's premium sits nationally

Average annual homeowners premium across 25,593 tracked ZIP codes, as of 2022

$7,901 Higher than most more expensive than 99% of 25,593 ZIP codes

tracked ZIP codes, bucketed by value

Each bar is a $0.25K-wide band; taller bars hold more ZIP codes. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source U.S. Treasury Federal Insurance Office · 2022

The local market map

Premium and nonrenewal do not always move together

The highlighted dot is ZIP 94027. Each other dot is a deterministic sample of ZIPs in California, spread across the premium range. Crosshairs mark the published state averages, so this is a comparison of two reported measures, not a quote or a forecast.

State ZIP peer map

Highlighted: ZIP 94027; crosshairs: California averages

Lower premium / higher nonrenewalHigher on bothLower on bothHigher premium / lower nonrenewal$285.7$3249.8$6213.9$9178.0$12142.10.1%2.3%4.5%6.7%8.8%Average annual premiumNonrenewal rate
Source: U.S. Treasury FIO 2022 ZIP-level homeowners insurance filings. The matrix samples 50 ZIPs across the state premium distribution and retains this ZIP.
Read the plotted ZIP values
  • ZIP 92257 · Niland $825/yr · 2.67%
  • ZIP 93648 · Parlier $949/yr · 0.74%
  • ZIP 93204 · Avenal $995/yr · 0.72%
  • ZIP 92259 · Ocotillo $1,024/yr · 1.20%
  • ZIP 93033 · Oxnard $1,053/yr · 1.37%
  • ZIP 95360 · Newman $1,085/yr · 0.83%
  • ZIP 96090 · Tehama $1,101/yr · 1.79%
  • ZIP 92408 · San Bernardino $1,125/yr · 1.43%
  • ZIP 93591 · Palmdale $1,162/yr · 1.40%
  • ZIP 93906 · Salinas $1,186/yr · 1.02%
  • ZIP 93723 · Fresno $1,209/yr · 0.64%
  • ZIP 95678 · Roseville $1,223/yr · 0.90%
  • ZIP 92316 · Bloomington $1,248/yr · 2.03%
  • ZIP 92250 · Holtville $1,270/yr · 1.11%
  • ZIP 95926 · Chico $1,288/yr · 0.50%
  • ZIP 92356 · Lucerne Valley $1,310/yr · 1.55%
  • ZIP 94014 · Daly City $1,334/yr · 0.59%
  • ZIP 93704 · Fresno $1,358/yr · 0.99%
  • ZIP 95119 · San Jose $1,383/yr · 0.51%
  • ZIP 94551 · Livermore $1,419/yr · 0.67%
  • ZIP 94303 · Palo Alto $1,452/yr · 0.60%
  • ZIP 90601 · Whittier $1,492/yr · 1.30%
  • ZIP 92614 · Irvine $1,533/yr · 0.79%
  • ZIP 93449 · Pismo Beach $1,569/yr · 1.03%
  • ZIP 94531 · Antioch $1,616/yr · 0.69%
  • ZIP 93010 · Camarillo $1,648/yr · 1.47%
  • ZIP 92021 · El Cajon $1,700/yr · 2.22%
  • ZIP 92069 · San Marcos $1,739/yr · 1.58%
  • ZIP 90039 · Los Angeles $1,785/yr · 0.86%
  • ZIP 90028 · Los Angeles $1,834/yr · 1.29%
  • ZIP 91007 · Arcadia $1,887/yr · 1.07%
  • ZIP 95453 · Lakeport $1,922/yr · 0.71%
  • ZIP 93551 · Palmdale $1,982/yr · 1.72%
  • ZIP 96044 · Hornbrook $2,033/yr · 3.83%
  • ZIP 95310 · Columbia $2,090/yr · 2.15%
  • ZIP 95916 · Berry Creek $2,131/yr · 8.45%
  • ZIP 95252 · Valley Springs $2,221/yr · 2.53%
  • ZIP 96121 · Milford $2,286/yr · 1.12%
  • ZIP 92028 · Fallbrook $2,350/yr · 2.62%
  • ZIP 95722 · Meadow Vista $2,408/yr · 6.95%
  • ZIP 94956 · Point Reyes Station $2,473/yr · 1.01%
  • ZIP 93601 · Ahwahnee $2,573/yr · 6.64%
  • ZIP 93921 · Carmel By The Sea $2,689/yr · 0.78%
  • ZIP 95922 · Camptonville $2,840/yr · 3.66%
  • ZIP 92061 · Pauma Valley $2,985/yr · 5.56%
  • ZIP 93924 · Carmel Valley $3,217/yr · 3.08%
  • ZIP 91316 · Encino $3,557/yr · 1.60%
  • ZIP 94133 · San Francisco $4,336/yr · 1.72%
  • ZIP 94027 · Atherton (this ZIP) $7,901/yr · 1.07%
  • ZIP 90210 · Beverly Hills $11,603/yr · 4.67%
Avg Premium (2022)
$7,901/yr
Above-median premium
+15.3% since 2018
Loss Ratio
25.8%
Below-median loss ratio
Claim Frequency
3.79%
Avg severity: $53,786
Nonrenewal Rate
1.07%
Near-median nonrenewal rate
+158.7% change

Data Snapshot: ZIP 94027 (Atherton, CA)

U.S. Treasury FIO ZIP-level observations put the average homeowners insurance premium in ZIP 94027 (Atherton, CA) at $7,901 per year for 2022 across approximately 526 reported policies. Against a national average of $1,776 per year, ZIP 94027 comes in 345% above, the 99th percentile among all tracked ZIPs. Against California's average of $1,864, ZIP 94027 is 324% above, ranking #6 of 1545 tracked ZIPs in California by premium. The closest-priced peer within California is Malibu (ZIP 90265) at $8,311, 5% above this ZIP's rate.

The loss ratio for ZIP 94027 is 25.8%, meaning insurers retained a working margin after claims. About 3.79% of policyholders in this ZIP file a claim annually, and the average claim severity (amount paid per claim) is $53,786. The nonrenewal rate here is 1.07%, a rise of 158.7% over the past five years, the share of policies insurers choose not to extend at expiration, often a leading sign of market stress.

Since 2018, premiums here have risen by 15.3% through 2022, ranging $6,855 to $8,139 with a 5-year average of $7,574, an annualized rate of +3.6% per year.

High-band NRI for ZIP 94027's county (San Mateo): score 99.2, rating Relatively High, hazard Earthquake. That is #12 of 58 California counties and the 99th national percentile (12% above the 88.7 state mean). Social Vulnerability Index 20.5 · Community Resilience 97.6. Source: FEMA National Risk Index.

How to read these numbers

The figures on this page come from the U.S. Treasury Federal Insurance Office, which collects homeowners insurance premium and claims data directly from the largest property insurers in the country. Because the data is aggregated at the ZIP-code level and averaged across many policies, it describes the typical cost in an area rather than a quote for any single home. Two houses on the same street can pay very different premiums depending on their age, construction type, roof condition, prior claims, and the specific coverage limits and deductibles the homeowner selects. The loss ratio shows how much of every premium dollar insurers paid back out as claims; a ratio above one means carriers lost money locally, which often precedes rate increases or carrier exits. Rising nonrenewal and claim frequency reveal how stressed the local market has become. Use these figures to gauge the direction and scale of costs in your area, then request quotes from several licensed carriers before buying or renewing a policy. FIO data aggregates voluntary reporting from the 40 largest homeowners insurers, covering roughly 80% of the U.S. market, so figures represent market averages rather than individual policy quotes; your own premium will vary with dwelling value, deductible, coverage limits, construction type, and insurer-specific underwriting. This page is educational research only and is not insurance advice, homeowners should request quotes from multiple licensed carriers or an independent agent before purchasing or renewing coverage.

How ZIP 94027 Compares

vs National Average
$7,901 vs $1,776
345% above national avg
vs California Average
$7,901 vs $1,864
324% above state avg
National Percentile
99th percentile
More expensive than most ZIPs

Premium History

Average premium in ZIP 94027, 2018–2022

$6,500$7,000$7,500$8,000$8,500 20182019202020212022 $7,901
Average homeowners premium per year in ZIP 94027.
Year Avg Premium YoY Change
2018 $6,855 -
2019 $7,249 +5.7%
2020 $7,728 +6.6%
2021 $8,139 +5.3%
2022 $7,901 -2.9%

Multi-year FIO trend for ZIP 94027 (5 years)

5-Year Avg Premium
$7,574
Premium Range
$6,855 - $8,139
Annual Change Rate
+3.6% per year
Years of Data
5 (2018-2022)

Elevated FEMA NRI in San Mateo County

County National Risk Index joined to ZIP 94027 via FIPS 06081. Hazard and vulnerability context from FEMA, not a premium driver and not a quote.

County risk score
99.2
Relatively High · 99th national percentile
In-state county rank
#12
of 58 California counties · state mean 88.7
Top mapped hazard
Earthquake
Expected annual loss $497,298,534

Social Vulnerability Index 20.5 · Community Resilience 97.6

County hazard ratings

Wildfire
Relatively Moderate
Flooding
Relatively High
Earthquake
Relatively High
Tornado
Relatively Low
Hail
Very Low
Winter weather
Very Low

Source: FEMA National Risk Index · state rollup: California NRI context · top counties by NRI score.

Out-of-state ZIPs near ZIP 94027's premium and nonrenewal (high-NRI county)

Cross-state peers for ZIP 94027: nearest FIO ZIPs by premium and by nonrenewal, drawn outside California. County hazard context (San Mateo, NRI 99.2) is separate from these price peers.

Similar average premium

Nearest other-state ZIPs by average homeowners premium ($7,901/yr here).

Similar nonrenewal rate

Nearest other-state ZIPs by nonrenewal rate (1.07% here).

Source: U.S. Department of the Treasury, Federal Insurance Office (FIO) Homeowners Insurance Data (2018-2022). Premiums are ZIP-level averages and may not reflect individual policy costs

Frequently Asked Questions

How much is homeowners insurance in ZIP 94027?
Homeowners insurance runs above most of the country in ZIP 94027 (Atherton, CA): $7,901/year as of 2022, the 99th national percentile, #6 of 1545 ZIPs in California. Premiums have changed +15.3% over the past 5 years.
What affects homeowners insurance costs in Atherton, CA?
In ZIP 94027, insurers report a 25.8% loss ratio, a 3.79% claims frequency, and a 1.07% nonrenewal rate, the 99th national percentile for cost.
Is homeowners insurance expensive in ZIP 94027 compared to the national average?
Nationally, ZIP 94027 lands in the 99th percentile: its $7,901/yr average is 345% above the U.S. figure of $1,776/yr.
What is the nonrenewal rate in ZIP 94027?
The nonrenewal rate in ZIP 94027 is 1.07%, a rise of 158.7% over the past 5 years in California.
How have premiums trended in ZIP 94027 over 5 years?
ZIP 94027 premiums spanned $6,855 to $8,139 across the 2018-2022 window, a 5-year average of $7,574. The annualized change rate is +3.6% per year.
How does ZIP 94027 compare to the California state average?
The California state average is $1,864/yr; ZIP 94027 averages $7,901/yr, 324% above that figure, ranking #6 of 1545 tracked ZIPs in California by premium.
What is the FEMA National Risk Index score for ZIP 94027?
County NRI 99.2 (Relatively High) covers ZIP 94027 via San Mateo County FIPS 06081. In-state rank #12 of 58; national percentile 99th; hazard Earthquake.

What to do with ZIP 94027

This ZIP's premiums run at the 99th national percentile, but a single number is not a quote.

These figures are Treasury FIO aggregates for this ZIP, not a personal insurance quote.

Every figure on PlainInsure is rendered directly from U.S. Treasury Federal Insurance Office data, no number is typed in by an editor. This page draws directly on U.S. Treasury FIO data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.