What ZIP code are San Mateo Eichlers in?

Both San Mateo Eichler tracts are in 94402. The San Mateo Highlands is 94402, and so is 19th Avenue Park — addresses on Joanne Drive, Edna Way, Celeste Drive and Vanessa Drive all carry 94402 in public property records. We had 19th Avenue Park down as 94403 until we checked the address records, and corrected it.

Is 94402 in the City of San Mateo?

Partly. 94402 covers territory in the City of San Mateo and territory in unincorporated San Mateo County. The Highlands Eichler tract is unincorporated county; 19th Avenue Park is inside the city limits. Both share the ZIP. A 94402 address tells you nothing about which government you are under, because ZIP codes are postal delivery routes, not civic boundaries.

Is a 94402 median price useful for valuing an Eichler?

Not really. A 94402 figure mixes hillside Eichlers in the Highlands, smaller Eichlers on the bay plain in 19th Avenue Park, and a large amount of non-Eichler San Mateo housing of every age and type. For an Eichler you want an Eichler-only cohort measured over a rolling twelve months, which is how we do it.

San Mateo · ZIP 94402

One ZIP code. Two tracts. Two governments.

Both of San Mateo's Eichler neighbourhoods carry the same ZIP. They are four miles and four hundred vertical feet apart, they answer to different governments, they feed different elementary schools, and one of them was finished before the other broke ground. If you are searching 94402, you are searching two markets at once.

94402

San Mateo Highlands

Unincorporated San Mateo County
Mid-1950s – 1964
~650–700+ Eichlers
Highlands Elementary

94402

19th Avenue Park

City of San Mateo
1953 – 1955
~235 Eichlers
Sunnybrae Elementary

Aerial view over the San Mateo Highlands Eichler tract, flat roofs in rows along the ridge with San Francisco Bay beyond. — The Highlands, from the air **One ZIP, two tracts, four miles apart** — This is the upper half of 94402 — the Highlands on its ridge. 19th Avenue Park is down on the bay plain in the haze, sharing the same five digits and almost nothing else.

A correction we made to this site

We had 19th Avenue Park listed as 94403. That was wrong. Public property records put Joanne Drive, Edna Way, Celeste Drive and Vanessa Drive — four of the tract's eight streets — in 94402, the same ZIP as the Highlands. We have corrected it everywhere on the site.

It is an easy mistake, because the tract sits near Concar Drive on the bay plain where you would expect 94403, and because nothing about a ZIP code follows the boundaries people actually care about. Which is the point of this page.

Why the ZIP misleads

A postal route is not a boundary.

ZIP codes exist to move mail efficiently. They were never drawn to follow city limits, school attendance areas, tax districts or neighbourhoods, and in San Mateo they conspicuously do not.

So 94402 spans two different governments. Permits, zoning, design review and policing in the Highlands are San Mateo County's. In 19th Avenue Park they are the City's. Same ZIP, completely different counter to stand at. What unincorporated actually means here →

It spans two elementary schools — Highlands Elementary and Sunnybrae Elementary, both in the San Mateo-Foster City district. The two tracts converge only from middle school onward, at Borel and then Aragon. Schools →

And it spans a great deal of housing that is not Eichler at all — which is what makes a 94402 market figure close to useless for anyone buying or selling one of these houses.

A 94402 address tells you your mail route. It does not tell you your government, your school, or what your house is worth.

Both tracts: 94402
Highlands jurisdiction: Unincorporated San Mateo County
19th Ave Park jurisdiction: City of San Mateo
Elementary: Highlands / Sunnybrae — different, same ZIP
Middle & high: Borel, then Aragon — shared
MLS area: 19th Avenue Park is area 418

What a 94402 search actually returns

Three quite different things, stacked together.

Why we do not publish a 94402 median. The Eichler-only figures below are the Highlands cohort, year built 1956–64, over the twelve months to September 2026 — the method is stated in full on the valuation page.
What's in 94402	Character	Eichler?
San Mateo Highlands	Hillside, ~469 ft, large lots by comparison, protected watershed on three sides, unincorporated county	Yes
19th Avenue Park	Bay plain, small lots of roughly 4,900–5,900 sq ft, three basic plans, two blocks from Caltrain, inside the city	Yes
The rest of 94402	Substantial non-Eichler San Mateo housing of every era and type, plus later infill inside the Highlands boundary itself	No

The practical version

If you set a portal alert on 94402 you will get hillside Eichlers, flatland Eichlers and a lot of houses that are neither, in one undifferentiated stream. If you read a 94402 median you are reading all three averaged together.

Neither is wrong, exactly. They are just not answering the question an Eichler buyer or seller is actually asking.

What we do instead

Measure the Eichler-era cohort only, by tract, over a rolling twelve months, with the sales and the exclusions named. For the Highlands that currently gives a median of $2,750,000 and $1,521 per square foot from thirty sales — with three non-Eichler sales inside the boundary stripped out and listed.

The method, the sales and the caveats →

Start here instead

Pick the tract, not the ZIP.

94402 · Unincorporated county

The San Mateo Highlands

Eichler's largest single tract, on a ridge with Revolutionary-War street names and a watershed that cannot be built on. Four architects across nine years.

~650–700+ homes · Highlands Elementary 94402 · City of San Mateo

19th Avenue Park

Two years older, four hundred feet lower, three basic plans on small lots, two blocks from Hayward Park Caltrain. Finished before the atrium existed.

~235 homes · Sunnybrae Elementary

ZIP boundaries are USPS delivery geography and can be changed by the Postal Service; jurisdiction, school assignment and tax district are set by entirely separate bodies and do not follow them. Verify all four for any specific address before relying on any of them — we will pull the parcel record for you.

Talk to us

Searching 94402? Tell us which house.

We will tell you which tract it is in, which government it answers to, which elementary school it feeds, and what comparable Eichler-era homes in that specific tract have actually sold for. Four answers a ZIP code cannot give you.