ZIP Code Guide
94303
South Palo Alto and Barron Park ZIP
Palo Alto's largest postal code: south-of-downtown neighborhoods, creek corridors, and residential blocks where the city meets the broader South Bay
- Barron Park
- South Palo Alto
- Charleston Meadows
- Oregon Expressway corridor
ZIP code 94303 covers the southern and western portions of incorporated Palo Alto within Santa Clara County — the city's most populous postal area and a geographically diverse ZIP spanning residential neighborhoods, commercial corridors, and interfaces with Stanford lands and adjacent communities. The code encompasses Barron Park, Charleston Meadows, and the Oregon Expressway corridor connecting Palo Alto to Highway 101.
Geographic Position
94303 extends southward from central Palo Alto through Barron Park and Charleston Meadows toward the city's boundaries with Mountain View, Los Altos, and unincorporated Stanford lands. Matadero Creek and Adobe Creek drain portions of the ZIP's western and southern reaches. Oregon Expressway and El Camino Real provide major east-west and north-south arterials.
Terrain transitions from flat valley-floor neighborhoods in the east to foothill-adjacent elevations in the southwestern Barron Park area, where Matadero Creek canyon and open-space interfaces define the landscape. The ZIP occupies the largest geographic footprint among Palo Alto's three postal codes within the city's twenty-four-square-mile incorporated area.
Neighborhood Character
Barron Park develops as a distinct neighborhood south of central Palo Alto; Charleston Meadows and adjacent areas fill with residential parcels on former agricultural land within the present 94303.
Stanford Research Park is established on university-owned land south of the campus, hosting technology firms that influence employment patterns for 94303 residents.
Postwar housing construction completes southern Palo Alto neighborhoods; Oregon Expressway is constructed, linking the area to Highway 101 and regional freeway networks.
Infill development and accessory dwelling unit construction add density in established neighborhoods while Barron Park maintains its distinct community identity.
Within 94303, Barron Park functions as a neighborhood with its own association and community character distinct from downtown Palo Alto. Charleston Meadows displays postwar ranch tracts on the valley floor. The Oregon Expressway corridor supports commercial and professional uses bordering residential blocks throughout the southern tier of the city.
Economy & Employment
94303 residents work across Silicon Valley, the Peninsula, and San Francisco. Stanford Research Park, though primarily in unincorporated county land, employs workers from throughout Palo Alto including 94303 addresses. Technology firms, medical offices, and professional services along Oregon Expressway and El Camino Real provide local employment.
Many commuters travel to Stanford University, Stanford Hospital, technology campuses in Mountain View and Cupertino, and Peninsula employers. The California Avenue business district in the adjacent 94306 ZIP provides commercial services accessible from southern Palo Alto neighborhoods.
Market & Housing Context
According to U.S. Census Bureau data for ZIP Code Tabulation Area 94303, the area had a population of approximately 46,879 and 15,891 housing units as of the 2020 Census. American Community Survey estimates for the 2019–2023 period indicate that roughly 58 percent of occupied housing units are owner-occupied and 42 percent are renter-occupied.
Single-family detached dwellings dominate the housing stock in Barron Park and Charleston Meadows, with ranch homes built from the 1950s through the 1970s constituting a significant share. Multifamily housing appears along El Camino Real and Oregon Expressway corridors. The owner majority documented in ACS data reflects the ZIP's substantial single-family residential character across its large geographic area.
Living in 94303
Mitchell Park — featuring the Magical Bridge Playground — provides major recreation within reach of 94303 neighborhoods. Barron Park's Matadero Creek corridor offers riparian walking paths. Greer Park and neighborhood green space dot residential blocks throughout southern Palo Alto.
Palo Alto Unified School District serves public school students, operating campuses including Gunn High School, Jane Lathrop Stanford Middle School, and Barron Park Elementary School. School assignments depend on specific address and district boundaries within the ZIP.
The California Avenue Caltrain station in the adjacent 94306 ZIP provides regional rail access. VTA bus routes serve El Camino Real and Oregon Expressway corridors. Foothills Park, a city-owned open-space preserve in southwestern Palo Alto, is accessible to Palo Alto residents from 94303 addresses.
94303 Today
46,879
Population (2020 Census ZCTA)
15,891
Housing Units (2020 Census)
23.9 sq mi
Palo Alto City Land Area
58%
Owner-Occupied Units (ACS 2019–2023)
Government and Civic Life
94303 falls within the City of Palo Alto municipal boundaries and Santa Clara County. The Barron Park Association and neighborhood groups throughout southern Palo Alto participate in city planning processes, traffic safety initiatives, and community events. City services are administered from City Hall on Hamilton Avenue.
Community Identity
Barron Park maintains a distinct neighborhood identity within 94303, with its own association organizing local events and land-use input. Mitchell Park's Magical Bridge Playground has become a regional destination for inclusive playground design. The Palo Alto World Music Day and Chili Cook-Off at Mitchell Park draw residents from across the city's ZIP codes.
Geography & Environment
94303 spans flat valley-floor terrain in Charleston Meadows and eastern portions, rising toward foothill elevations in Barron Park's southwestern reach. Matadero Creek and Adobe Creek provide riparian corridors within the ZIP. The Mediterranean climate supports coast live oaks in sheltered areas and ornamental street trees throughout residential blocks.
Foothills Park preserves oak woodlands and chaparral in the city's southwestern reaches, accessible to Palo Alto residents and their guests.
Transportation & Connectivity
Oregon Expressway and El Camino Real provide primary arterials through 94303. Highway 101 runs along the city's eastern edge, accessible via Oregon Expressway. The California Avenue Caltrain station serves regional rail connections. VTA bus routes link southern Palo Alto to Mountain View, Los Altos, and regional destinations.
San Francisco International Airport is approximately twenty-five miles north via Highway 101.
Looking Forward
Palo Alto's housing element identifies southern neighborhoods within 94303 for potential infill development and accessory dwelling unit construction. Barron Park community input shapes planning decisions affecting the neighborhood's character. Climate adaptation planning addresses creek management along Matadero Creek and wildfire risk in foothill-adjacent areas.
Stanford Research Park development discussions may affect employment and traffic patterns for 94303 residents commuting to the university-adjacent research zone.
The ZIP's Character
94303 represents Palo Alto's residential expansion beyond the downtown core — a ZIP where Barron Park's neighborhood identity, Charleston Meadows ranch tracts, and foothill-adjacent open space define daily life for the city's largest population cluster. The area's development reflects decades of South Bay growth driven by Stanford's influence and regional technology employment.
"94303 carries Palo Alto south of University Avenue — Barron Park creek paths, Mitchell Park's playgrounds, and ranch-era streets where the city's largest ZIP meets the broader Silicon Valley floor."
From Matadero Creek walks to Mitchell Park recreation, 94303 offers a geographically varied slice of Palo Alto within a single postal boundary. Buyers, sellers, and investors evaluating the area benefit from understanding its neighborhood submarkets and position as Palo Alto's most populous ZIP code.