Zip lookup · CA

94028
Portola Valley, California.

Portola Valley, San Mateo County, CA · San Francisco-Oakland-Berkeley, CA metro · population 6,531

What it costs per month · 94028 $22,733/mo

to buy the typical home at today's mortgage rate — +$11,344 (+100%) since Jan 2020.

What the home itself did
1 year
Up $465,486 +12%
$3,865,693$4,331,179 since Sep 2025
5 years
Up $848,342 +24%
$3,482,837$4,331,179 since Sep 2021

Monthly payment to buy the typical home

Home value × that month's 30-year mortgage rate, 20% down, principal and interest. This is the line households feel: prices and rates compound each other.

$5,000 $10,000 $15,000 $20,000 2002 2006 2010 2014 2018 2022 2026 94028 $22,733 United States $1,922
$5,000 $10,000 $15,000 $20,000 2002 2010 2018 2026
  • 94028$22,733
  • United States$1,922

At the last five years' pace, a typical home here doubles in price every 16 years.

Typical home values in zip 94028 rose 12.0% over the past year — faster than the nation's +1.2%.

This zip spans 2 counties: San Mateo County, CA 81% · Santa Clara County, CA 19%

Zillow also publishes an index for the city itself: Portola Valley, CA — measured over the city limits, which is a different area from this zip.

Typical home value $4,331,179 as of Sep 2026
+12.0%year on year

Typical home value — 94028

Mid-tier homes, smoothed and seasonally adjusted.

$1,000,000 $2,000,000 $3,000,000 $4,000,000 2018 2020 2022 2024 2026 94028 $4,331,179 San Francisco $1,120,379 United States $366,157
$1,000,000 $2,000,000 $3,000,000 $4,000,000 2018 2022 2026
  • 94028$4,331,179
  • San Francisco$1,120,379
  • United States$366,157

Within 20 miles

Showing 30 of 71 zips in range — sorting picks from all 71.

Miles sorted ascending, activate to sort descending Zip activate to sort by Zip City activate to sort by City Population activate to sort by Population Rent activate to sort by Rent Home value activate to sort by Home value
2.9 94304 Palo Alto 5,000 — $3,193,983
3.6 94305 Stanford 18,509 — $3,211,123
3.9 94022 Los Altos 20,027 $6,586 $5,059,470
5.3 94306 Palo Alto 27,183 $4,312 $3,368,178
5.5 94025 Menlo Park 40,721 $4,261 $2,934,751
5.5 94027 Atherton 7,002 $15,500 $8,728,582
5.8 94062 Redwood City 25,759 $3,541 $2,711,349
5.9 94301 Palo Alto 17,508 $4,219 $4,337,456
6.1 94061 Redwood City 37,048 $3,820 $1,963,145
6.2 94020 La Honda 1,694 — $1,022,690
6.4 94024 Los Altos 23,051 $8,082 $4,604,457
6.9 94040 Mountain View 35,632 $4,440 $2,782,759
7.3 94303 Palo Alto 46,879 $5,522 $2,061,587
7.5 94041 Mountain View 16,050 $4,652 $2,229,903
8.2 94063 Redwood City 34,433 $4,678 $1,272,610
8.2 94043 Mountain View 33,176 $4,594 $1,513,645
8.6 95014 Cupertino 60,932 $4,258 $2,957,803
9.1 94070 San Carlos 30,447 $4,365 $2,445,009
9.7 94087 Sunnyvale 57,767 $3,694 $2,712,454
10.3 94086 Sunnyvale 49,746 $4,122 $1,839,541
10.7 94085 Sunnyvale 24,024 $4,026 $1,474,341
10.7 94002 Belmont 27,534 $3,789 $2,270,293
11.1 94089 Sunnyvale 22,699 $3,897 $1,399,408
11.2 94065 Redwood City 11,673 $3,986 $1,778,947
11.6 94019 Half Moon Bay 14,419 $4,625 $1,585,013
12.0 95070 Saratoga 31,417 $6,140 $3,962,763
12.4 94403 San Mateo 43,276 $3,886 $1,808,982
12.4 95002 Alviso 1,542 — $1,162,613
12.5 95129 San Jose 41,321 $3,121 $2,508,365
12.5 94060 Pescadero 1,465 — $1,161,586

Coordinates and population from SimpleMaps US Zips (Basic). Rent and home values from Zillow Research.