San Carlos (Spanish for "St. Charles") is a city in San Mateo County, California, United States. San Carlos is a part of Silicon Valley. The population is 30,722 per the 2020 census.

Official town website ↗

From Wikipedia, licensed CC BY-SA 4.0 · facts via Wikidata (CC0)

How San Carlos ranks

All →

#18Most active in CA #11Rent easiest to afford in CA #24Healthiest in CA All CA rankings →

Town numbers

ZIP code94070–94071, 94070

Area code650

Living in San Carlos

Housing in San Carlos

$2.43M▲ 7.4% in a year Typical home value · Zillow

The typical San Carlos home is worth about $2,433,000, up 7.4% in a year, 218% above the California typical home.

A strong seller's market

Buyer’sBalancedSeller’s

Days on market12

Sale-to-list106.7%

Sold in May37

Zillow Home Value Index · Redfin Data CenterHousing market →

Health in San Carlos

A⁺

Health Grade A+

Healthier than 98% of U.S. towns on seven CDC estimates.

Compared with California

22better than CA·1worse

of 32 measures CDC estimates. The other 9 are too close to call.

Conditions 6▲ 1▼ 5 close Habits 3▲ 1 close Care 4▲ 3 close Mind 5▲ 0 close Everyday needs 4▲ 0 close

BetterToo close to callWorse

What stands out

3.9%Fewer uninsured adultsCA 10.6% · better 7.2%Fewer adults facing food insecurityCA 17.9% · better 8.5%More adults who have had cancerCA 6.4% · worse

Care nearby

Kaiser Foundation Hospital - Redwood CityRedwood City · 2.4 mi · ER

Ravenswood Family DentistryRedwood City · 1.9 mi · sliding-scale fees

Primary careNo shortage

DentalNo shortage

Mental healthNo shortage

CDC PLACES 2025 · modeled estimates for adults · CDC's estimate for San Carlos · CMS · HRSAHealth in San Carlos →

Natural hazards in San Carlos

Very high

Expected storm and flood damage is higher than in 87% of U.S. communities.

🏚️ Earthquakes🌊 Inland flooding

48Does San Carlos flood?paid flood claims since 1978 5Disasters that paid out herefederal disasters sent FEMA money to San Carlos MapSan Carlos vs. its neighborsnearby towns shaded by rating

FEMA National Risk Index December 2025 · OpenFEMANatural hazards in San Carlos →

Climate in San Carlos

Full climate →

San Carlos has warm winters and pleasant summers, with very little rain. A typical July afternoon reaches 79°, a January night drops to 40°, and snow is almost unheard of.

60° / 41°Winter

67° / 46°Spring

78° / 53°Summer

73° / 49°Fall

How much snow does San Carlos get?Almost none.Rain & snow →Does it ever freeze?In about 88% of years.Frost →Is it warmer than it used to be?+1.7° vs. the 20th century.Then & now →

NOAA U.S. Climate Normals, 1991–2020Climate in San Carlos →

Schools in San Carlos

All San Carlos schools →

School Grade A

The public schools San Carlos’s kids attend, from kindergarten through graduation, outperform 87% of California’s districts on state tests and graduation. Among towns with similar incomes, they sit near the middle.

#32Best public schoolsof 574 in CA

DistrictSan Carlos ElementarySchools12

Brittan Acres Elementary AElementary · Grades K–3 · 411 students Arundel Elementary A+Elementary · Grades K–3 · 388 students San Carlos Charter Learning Center AElementary · Grades K–8 · 377 students Mariposa AElementary · Grades 4–5 · 322 students Heather Elementary AElementary · Grades K–3 · 320 students Arroyo AElementary · Grades 4–5 · 290 students

School data from the U.S. Department of Education (NCES, EDFacts). The School Grade is our own summary of state test results and graduation rates, graded within CA. Ratings are from neighbors.