94040

ZIP code 94040 covers the central and southern portions of incorporated Mountain View within Santa Clara County — a postal area anchored by the Castro Street downtown district and encompassing diverse residential neighborhoods from Cuesta Park to Monta Loma. The code represents the historic core of a city whose name reflects views toward the Santa Cruz Mountains from the Santa Clara Valley floor.

Geographic Position

94040 extends from the Castro Street downtown corridor southward through established residential neighborhoods toward the city's boundaries with Los Altos and Sunnyvale. Stevens Creek drains through the western portion of the ZIP, connecting to regional trail networks. Central Expressway and Middlefield Road serve as major north-south arterials.

The ZIP occupies valley-floor terrain characteristic of northern Silicon Valley, with flat to gently rolling topography supporting both the grid of downtown streets and the curved residential blocks of mid-century neighborhoods. Caltrain's Mountain View station sits at the downtown edge, marking a major regional transit hub within the postal boundary.

Neighborhood Character

Within 94040, Castro Street downtown forms the civic and social heart — a walkable corridor of restaurants, cafes, and shops. Cuesta Park and Sylvan Park neighborhoods feature single-family homes on tree-lined streets. Monta Loma displays postwar ranch tracts developed during the valley's suburban expansion. The Mountain View Center for the Performing Arts and public library anchor civic life near downtown.

Economy & Employment

94040 residents work across Silicon Valley and the Peninsula. While major technology campuses including the Googleplex lie primarily in the 94043 ZIP to the north, downtown Mountain View supports restaurants, retail, and professional services along Castro Street. The San Antonio Shopping Center and Rengstorff Avenue commercial areas border portions of the ZIP.

Caltrain connectivity at the downtown station supports commuting patterns to San Francisco and San Jose. Healthcare, hospitality, and public-sector employment through city government and school districts contribute to local job opportunities. Many residents travel to North Bayshore, Stanford Research Park, and Peninsula employers during the workday.

Market & Housing Context

According to U.S. Census Bureau data for ZIP Code Tabulation Area 94040, the area had a population of approximately 35,632 and 17,302 housing units as of the 2020 Census. American Community Survey estimates for the 2019–2023 period indicate that roughly 37 percent of occupied housing units are owner-occupied and 63 percent are renter-occupied.

The housing stock within 94040 includes a significant share of multifamily structures — apartment complexes near downtown, along El Camino Real, and in the Monta Loma and Whisman-adjacent areas. Single-family detached homes concentrate in Cuesta Park, Sylvan Park, and Blossom Valley portions of the ZIP. The renter-majority tenure pattern reflects both multifamily housing stock and the area's role as a destination for regional workers.

Living in 94040

Castro Street downtown draws residents and visitors for dining and shopping throughout the week. The Mountain View Farmers' Market operates on Sundays near the Caltrain station. Cuesta Park, Rengstorff Park, and McKelvey Park offer neighborhood recreation. Stevens Creek Trail connects the area to Cupertino and regional cycling networks.

Mountain View Whisman School District and Mountain View-Los Altos Union High School District serve public school students, operating campuses including Mountain View High School, Graham Middle School, and Castro Elementary School. St. Joseph School operates as a private institution in the city. School assignments vary by specific address within the ZIP.

Caltrain provides commuter rail at the downtown station. VTA light rail operates along the Mountain View-Winchester corridor with a station near Castro Street. VTA bus routes serve local and regional corridors.

94040 Today

Geography & Environment

94040 occupies flat terrain on the Santa Clara Valley floor, with Stevens Creek draining through the western portion. The Mediterranean climate features warm summers moderated by bay breezes and mild, wet winters. Urban tree canopy along residential streets and in public parks contributes to the area's suburban environmental character.

Shoreline Park and the Bay Trail lie within reach to the north in the 94043 ZIP, providing baylands recreation accessible from central Mountain View addresses.

Transportation & Connectivity

94040 is a major transit hub within Mountain View. Caltrain connects downtown to San Francisco and San Jose. VTA light rail serves the Castro Street area. Highway 101 runs through the eastern portion of the city, accessible from 94040 via Rengstorff Avenue and Central Expressway. State Route 85 provides southwestern connectivity.

Norman Y. Mineta San Jose International Airport is approximately fifteen miles southeast of downtown Mountain View.

Looking Forward

Mountain View's planning agenda includes housing production near downtown and transit corridors within 94040, Castro Street streetscape improvements, and bicycle infrastructure investments. The city's general plan update addresses climate resilience and housing mandates affecting central neighborhoods.

Approved housing projects near the Caltrain station may add multifamily units while established single-family neighborhoods receive preservation-focused planning attention.

The ZIP's Character

94040 embodies Mountain View's civic identity — a ZIP where Castro Street's small-town feel coexists with Caltrain connectivity and the residential neighborhoods that have housed Silicon Valley workers for generations. From Don Castro's adobe to the Shockley lab era, the area's timeline maps the region's journey from agriculture to technology.

“"94040 centers on Castro Street — where Caltrain, Sunday farmers markets, and valley-floor neighborhoods converge in a Mountain View ZIP that feels like a downtown before it feels like a suburb."

From riding Caltrain to San Francisco to walking Castro Street on a Saturday evening, 94040 offers the civic heart of Mountain View within a single postal code. Buyers, sellers, and investors evaluating the area benefit from understanding its renter-majority tenure, downtown proximity, and transit connectivity.