ZIP Code 94028 — Portola Valley town, CA Demographics & Data

ZIP code 94028 covers Portola Valley, CA in San Mateo County with a population of about 6,645.

At a glance, the area shows median age of 56.4 versus a U.S. median of about 38.9.

It sits in telephone area code 650; U.S. House district CA-16; the SAN FRANCISCO - OAK - SAN JOSE media market.

Portola Valley, CA sits in a university / college context (near palo alto university (1.3 mi)). Expect stronger interest in student housing, rentals, walkability, transit, and a younger adult age mix versus typical suburban ZIPs.

Median household income in ZIP 94028 is about $250,001 — about 233% above the U.S. median ($75,149).

On socioeconomic markers, US5 shows a poverty rate of 3.8%; unemployment rate near 3.0%; 78.0% of adults with a bachelor’s degree or higher (about 44.3 points above the national share (33.7%)).

Labor and commute patterns include leading industry context around Professional services, Agriculture, and Education; about 39.6% of workers reporting work-from-home (about 24.4 points above the U.S. share (15.2%)); a mean commute of about 180.0 minutes (U.S. average near 26.8).

Median home value is about $2,000,001 — about 475% above the U.S. median home value ($348,079).

Housing tenure and rents show median gross rent around $3,501 (about 201% above the U.S. median rent ($1,163)), and owner-occupancy near 84.6% (about 19.2 points above the national owner-occupancy rate (65.4%)).

To comfortably buy a median-priced home in ZIP 94028 in Portola Valley, CA, a household would need roughly $551,000 in annual income under a 20% down, 30-year loan at 6.8% (illustrative), keeping housing costs near 28% of income. Estimated monthly PITI is about $12,847. That is about 120% above the local median household income ($250,001), so the median earner would likely stretch or need a larger down payment. Rates, taxes, insurance, and HOA fees vary — treat this as a planning estimate, not a lender quote.

FEMA’s National Risk Index rates natural-hazard risk for Portola Valley town, CA as Relatively High (composite score 99.2), which is among the highest nationally. The strongest component scores on US5 are flood (98.4) and wildfire (92.0). These scores are county-linked NRI values published for planning context — all ZIP codes in the same county share the same composite score on US5. Useful when comparing insurance and disaster exposure across areas, not a substitute for a parcel-level flood or fire determination.

Climate normals for Portola Valley town, CA show little to no average snow.

IRS migration statistics show a net inflow of about 327 for ZIP 94028 (Portola Valley town, CA) on US5’s published series — a signal of people/tax filers moving in relative to those leaving. Inflows often track job growth, housing demand, or lifestyle migration; treat the figure as a directional indicator rather than a precise headcount.