City Guide
San Lorenzo
Unincorporated Community, Strong Identity
A Census-Designated Place with Deep East Bay Roots: An unincorporated Alameda County community between Hayward and Ashland
San Lorenzo is an unincorporated census-designated place (CDP) in Alameda County, located between the cities of Hayward and Ashland along the San Lorenzo Creek corridor. Unlike the incorporated cities surrounding it, San Lorenzo receives municipal services from Alameda County rather than an independent city government. With a population of nearly 30,000, it functions as a distinct residential community with its own schools, commercial corridors, and neighborhood identity.
Indigenous / Early History
Ohlone peoples lived along San Lorenzo Creek and the surrounding flatlands for thousands of years. The creek provided freshwater, supported riparian ecosystems, and gave the community its name — San Lorenzo honors Saint Lawrence and was applied by Spanish missionaries and settlers to the waterway and surrounding lands. Indigenous communities managed the oak woodlands and grasslands of the East Bay flats for acorn harvest and seasonal gathering.
The area became part of Rancho San Lorenzo during the Mexican period.
Founding & Early Development
Guillermo Castro receives the Rancho San Lorenzo land grant, covering much of present-day San Lorenzo, Hayward, and San Leandro.
American settlers establish farms and ranches along the creek.
The San Lorenzo Village development begins, creating a planned residential community.
San Lorenzo Village is completed as a planned community with schools, a shopping center, and uniform architectural styles.
The San Lorenzo Village project, developed by David D. Bohannon, was among the earliest large-scale planned communities in the East Bay, establishing the physical character that persists in the CDP today.
Twentieth-Century Growth
Postwar expansion filled surrounding areas with tract housing, while San Lorenzo Village maintained its distinct layout and architectural cohesion. The community remained unincorporated as neighboring Hayward and San Leandro incorporated, a status that continues to define its governance structure.
Suburban growth surrounds San Lorenzo Village, integrating the CDP into the broader East Bay metropolitan area.
San Lorenzo Unified School District is established (later becoming part of San Lorenzo Unified).
Community planning efforts address housing, commercial revitalization, and infrastructure through the county's unincorporated area governance framework.
Economy & Employment
San Lorenzo's local economy is primarily neighborhood-serving retail along Hesperian Boulevard, Washington Boulevard, and the San Lorenzo Village shopping center. Most employed residents commute to jobs in Hayward, Oakland, San Francisco, Silicon Valley, and other regional employment centers. Healthcare, education, and public sector employment through Alameda County and local school districts provide nearby jobs.
The community has no large industrial or corporate campuses within its boundaries.
Market & Housing Context
The 2020 U.S. Census recorded 29,581 residents and approximately 9,500 housing units in the San Lorenzo CDP. Housing includes the distinctive single-story homes of San Lorenzo Village — often with shared architectural features from the 1940s development — alongside postwar tract homes and apartment complexes along major corridors. American Community Survey data show a mix of owner- and renter-occupied units, with moderate homeownership rates compared to surrounding incorporated cities.
As an unincorporated area, land-use and housing decisions are made through Alameda County's planning department rather than a local city council.
Living in San Lorenzo
San Lorenzo Community Park and Pheasant Creek Park provide recreation. The San Lorenzo Library, operated by Alameda County, serves as a community hub. San Lorenzo Unified School District operates Arroyo High School, Eastbrook Middle School, and several elementary schools including Bay Elementary and Colonial Manor.
The San Lorenzo Village shopping center remains a commercial focal point for daily needs. The San Lorenzo Community Day event, held annually, brings neighbors together for food, music, and local organization booths. The Hesperian Corridor connects San Lorenzo to regional shopping in Hayward and San Leandro, while the nearby San Lorenzo Community Park hosts youth sports leagues and seasonal events.
San Lorenzo Today
30K
Population (2020 Census)
2.8 sq mi
CDP Land Area
1944
San Lorenzo Village Completed
9.5K
Housing Units (2020 Census)
Governance and Civic Life
San Lorenzo is governed by the Alameda County Board of Supervisors, with planning and municipal services administered through county departments. The San Lorenzo Village Homes Association and neighborhood groups advocate for community interests. Periodic discussions about incorporation or annexation have occurred but the community remains unincorporated.
Geography & Environment
San Lorenzo occupies flat terrain along the San Lorenzo Creek corridor, bounded by Hayward to the south and Ashland to the north. The Mediterranean climate brings mild winters and warm summers typical of inland East Bay flatlands. The creek provides a green corridor through the community, though much of it has been channelized for flood control.
Transportation & Connectivity
San Lorenzo is served by AC Transit bus routes connecting to BART stations in Hayward and San Leandro. Interstate 880 is accessible via Winton Avenue and Hesperian Boulevard. The South Hayward BART station is the nearest rapid transit connection. Oakland International Airport is a short drive away.
The San Lorenzo Creek Trail, when completed in additional segments, will improve non-motorized connectivity between the CDP and neighboring cities. Regional bus routes along Hesperian Boulevard link residents to employment centers in Hayward, San Leandro, and the broader East Bay.
Looking Forward
Planning for San Lorenzo occurs through Alameda County's unincorporated area plans, addressing housing production, commercial corridor revitalization, and infrastructure maintenance. Community input shapes priorities for parks, street improvements, and school facilities through the county's governance process.
The Hesperian Corridor Study examines opportunities for improved pedestrian safety, streetscape enhancements, and commercial vitality along one of the CDP's primary arterials. Alameda County's Zone 7 Water Agency maintains flood control channels along San Lorenzo Creek, and community groups participate in creek cleanup events throughout the year. Discussions about the future of the San Lorenzo Village shopping center continue to engage residents and county planners in evaluating redevelopment options.
The City's Character
San Lorenzo functions as a cohesive residential community with a distinct identity despite lacking independent municipal incorporation. Its planned village heritage, diverse population, and central East Bay location define daily life for nearly 30,000 residents.
"San Lorenzo proves that community identity does not require a city charter — an unincorporated East Bay place where a 1940s planned village still shapes neighborhood life."
From rancho lands to a planned village to a modern census-designated place, San Lorenzo continues to serve as a residential anchor in central Alameda County. The community's unincorporated status means that county supervisors and planning staff play a direct role in shaping its future, and residents maintain an active voice in land-use decisions affecting their neighborhoods.