Los Altos, CA land: flood, zoning and parcels
11,283 parcels
3.8% of Los Altos’s 11,283 parcels are in a FEMA flood zone.
Map data Oct 11, 2026
- Acres on the roll3,242
- In a FEMA flood zone3.8%special flood hazard area
California 2026-27 taxes: bills go out by November 1; first installment due by December 10, 2026, second by April 12, 2027. Pay or check a bill at the Santa Clara County Department of Tax and Collections.
Free account: 25 parcel cards a day on the map, with watches and a saved search. Get started free
Around Los Altos
Parcels to start with
Flood zones and wetlands
Recorded flood claims in Los Altos
Fewer than 10 insured flood claims were recorded in and around Los Altos since 1978.
What flood insurance costs in Los Altos
In and around Los Altos, insured single-family homes outside the mapped flood zone pay about $730–$1,010 a year for flood insurance, and $670–$1,000 in an A zone (special flood hazard area).
| Flood zone | Policies | Middle half | Full-risk median |
|---|---|---|---|
| A zones (special flood hazard area) | 16 | $670–$1,000 | $830 |
| X zone (outside the mapped flood zone) | 47 | $730–$1,010 | $1,140 |
People and new homes in Los Altos
About 30,965 people live in Los Altos, and 133 new homes were permitted in 2025.
- Population30,965July 2025 estimate, −1.2% since 2020
- Median household income$250,000 or more2020–2024 average
- New homes permitted1332025, 81 single-family; 134 in 2021
- Permitted so far in 202642Jan–Aug, against 108 a year earlier
Typical lot sizeThe typical lot, from the roll
The median parcel in Los Altos is 0.25 acre (10,585 parcels with a size).
Acres from the county roll, or from the parcel's own outline where the roll's figure is off by more than three times. Condominium units that share one point (each carrying the whole complex's acres) are left out of the lot sizes.
How Los Altos is zonedThe most common districts
| Zoning district | Parcels | Share of zoned |
|---|---|---|
| R1-10 | 9,194 | 82% |
| PUD | 325 | 2.9% |
| CT | 280 | 2.5% |
| R3-1.8 | 268 | 2.4% |
| R3-1 | 217 | 1.9% |
| CD/R3 | 211 | 1.9% |
| CRS | 123 | 1.1% |
| R1-20 | 119 | 1.1% |
Zoning is on file for 100% of parcels in Los Altos, across 20 districts (the newest zoning map is dated Jul 2023; each parcel page gives its own map's date). A district shown by its code alone has no published name on our map. The town or county zoning office has the final word on any parcel.
Land parcels in Los AltosFarm and timber parcels to start with
- 373 Pine Ln 6.02 acres
- 401 Rosita Av 5.63 acres
- 5.0 acres of land
- 201 Almond Av 30.5 acres
- 300 Manresa Wy 24.9 acres
- 100 W Portola Av 18.8 acres
- 1120 Covington Rd 16.6 acres
- 201 Covington Rd 15.3 acres
Farm parcels of an acre or more, each with its own page of public roll facts.
Nearby townsTowns around it
Questions about Los Altos landAnswers from the public records
How many parcels are in Los Altos, CA?
11,283 parcels on the Santa Clara County tax roll (as of Oct 2026) inside the Census Bureau's boundary for Los Altos, which can differ from its own limits at the edges, covering 3,242 acres.
How much vacant land is in Los Altos, CA?
Santa Clara County's tax roll codes little or no vacant land, so we do not count it here.
What is the typical lot size in Los Altos?
The median parcel is 0.25 acre, from 10,585 parcels with a recorded size.
How much of Los Altos is in a flood zone?
3.8% of parcels are in a FEMA special flood hazard area (National Flood Hazard Layer, as of Oct 2026). Check each parcel's own flood line before you buy.
Are there wetlands in Los Altos?
0.2% of parcels are a quarter or more wetland on the USFWS National Wetlands Inventory, a mapping guide, not a legal delineation.
What is Los Altos zoned?
Zoning is on file for 100% of parcels (zoning maps as of Jul 2023). The most common districts: R1-10, PUD, CT.
Are there land prices for Los Altos?
No land-price range is shown for Los Altos yet. We have no sale-price file for Santa Clara County yet.
How many people live in Los Altos?
About 30,965 (Census estimate for July 1, 2025), −1.2% since 2020.
How many new homes are being built in Los Altos?
Building permits authorized 133 new housing units in 2025 and 42 from January to Aug 2026 (against 108 a year earlier) (Census Building Permits Survey).
Where does this data come from?
Parcels: County of Santa Clara. Flood: FEMA National Flood Hazard Layer. Wetlands: USFWS National Wetlands Inventory. Towns: U.S. Census places. Every figure is counted from those files on our map.
More in Santa Clara CountyIts other towns
Sources & methodSources, dates and how these figures are built
Property tax due dates
California Revenue and Taxation Code 2617, 2618, 2619 and 1603; the State Board of Equalization’s 2026 appeal filing periods. Checked Oct 13, 2026.
Recorded flood claims in Los Altos
FEMA counts claims on buildings with NFIP flood insurance, so land without an insured building never shows here. Claims counted from 1978 to Sep 2026.
Source: OpenFEMA NFIP Redacted Claims v3, as of Sep 2026.
What flood insurance costs in Los Altos
Middle half: the middle half of premiums on single-family NFIP policies that took effect Sep 2025–Sep 2026, by the flood zone each policy is rated in. It is what insured homes here pay, not a quote for any one building.
Full-risk median: the median of FEMA's own full-risk premium for the same policies (Risk Rating 2.0). A discounted policy rises toward it a step each year, within the law's cap on yearly increases.
Source: OpenFEMA NFIP Redacted Policies v3, as of Sep 2026.
Counted in the 23 census block groups that lie mostly inside Los Altos, so the edges may reach past the town line.
People and new homes in Los Altos
U.S. Census Bureau, Population Estimates Program, Vintage 2025 (May 2026); U.S. Census Bureau, American Community Survey 2020-2024 5-year (B19013) (Jan 2026); U.S. Census Bureau, Building Permits Survey (Sep 2026).
Sources
Parcels: County of Santa Clara (roll as of Oct 2026); flood: FEMA National Flood Hazard Layer (as of Oct 2026); wetlands: USFWS National Wetlands Inventory (as of Oct 2026); town limits: U.S. Census Bureau TIGER/Line places; counted on our map built Oct 2026.
This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data.