California Private Investigator Service Locations
I Provide California Licensed Private Investigation Services
I work with clients across the San Francisco Bay Area to provide boutique style investigation services.
Across the San Francisco Bay Area, individuals, families, executives, and legal teams rely on Spade & Archer® for discreet, licensed investigative services. From Napa Valley and Marin to the Peninsula and Silicon Valley, and from the East Bay to San Francisco itself, the firm provides confidential investigations grounded in experience, legal compliance, and a deep understanding of the region’s privacy expectations.
Whether the matter involves complex background inquiries, digital evidence in a sensitive dispute, asset tracing across multiple jurisdictions, internal conflicts affecting a Bay Area business, or locating a person tied to a legal or family matter, Spade & Archer delivers investigative work designed to reveal the truth — not noise.
Each Bay Area resource below reflects the realities of California law, regional agencies, and cultural considerations unique to the Bay Area — ensuring the investigative strategy fits both the case and the environment in which it unfolds.
If your city isn’t listed, Spade & Archer continues to serve clients nationwide, with investigative reach covering every major U.S. metro area and the ability to conduct matters discreetly across borders when circumstances require it.
Peninsula (San Mateo County & Silicon Valley Gateway)
The Peninsula blends old-line estates with the fast pace of Silicon Valley. Investigations here often involve executive concerns, reputation-sensitive family matters, and due diligence tied to tech-sector mobility. Clients value discretion especially in communities like Hillsborough, Burlingame, Palo Alto, and Menlo Park, where privacy expectations run high.
Local Useful Contacts:
• San Mateo County Sheriff: 650-363-4911
• Palo Alto Police (non-emergency): 650-329-2413
For discreet Peninsula investigations: Spade & Archer® — 415.715.1956
Marin County (Mill Valley, Sausalito, Tiburon & Beyond)
Marin’s quiet residential communities often require sensitive, low-visibility investigative work. Matters here may involve family concerns, asset clarity, or discreet inquiries involving professionals seeking privacy away from the City. The region’s geography also makes fieldwork uniquely nuanced compared to other parts of the Bay.
Local Useful Contacts:
• Marin County Sheriff: 415-479-2311
• Mill Valley Police: 415-389-4100
For confidential Marin investigations: Spade & Archer® — 415.715.1956
Sonoma Valley (Sonoma, Glen Ellen, Kenwood & Surrounding Areas)
Sonoma’s agricultural roots and tight-knit communities require a measured investigative approach. Cases may involve property disputes, due diligence for vineyard transactions, or sensitive family inquiries handled quietly and professionally. Sonoma clients often seek long-form investigations that balance privacy with thorough documentation.
Local Useful Contacts:
• Sonoma Police (via Sheriff): 707-565-2121
• Sonoma County Sheriff: 707-565-2510
For discreet Sonoma Valley investigations: Spade & Archer® — 415.715.1956
San Francisco (The City & County of San Francisco)
San Francisco presents a unique investigative landscape: high-density neighborhoods, complex professional circles, and a culture where personal and digital identities frequently overlap. From reputation concerns and internal conflicts to due diligence for legal teams, investigative needs here demand precision and absolute confidentiality.
Local Useful Contacts:
• SFPD Non-Emergency: 415-553-0123
• SF Sheriff’s Office: 415-554-7225
For investigations within San Francisco: Spade & Archer® — 415.715.1956
Napa Valley (Napa, Yountville, St. Helena & Calistoga)
Napa’s blend of long-standing families, estates, and hospitality-driven enterprises often leads to investigations involving property concerns, due diligence, personal matters, and the need for discreet fact-finding. The region’s tourism profile also increases issues involving short-term encounters and reputation challenges.
Local Useful Contacts:
• Napa Police (non-emergency): 707-257-9223
• Napa County Sheriff: 707-253-4451
For investigative support in Napa Valley: Spade & Archer® — 415.715.1956
East Bay (Oakland, Berkeley, Walnut Creek, Orinda & Beyond)
The East Bay’s diversity — from dense urban environments to quiet hillside communities — creates a broad spectrum of investigative needs. These may involve legal disputes, workplace matters, asset tracing, or verification of information in complex personal cases. Many clients here request documented findings for legal or professional use.
Local Useful Contacts:
• Oakland Police (non-emergency): 510-777-3333
• Alameda County Sheriff: 510-272-6912
• Walnut Creek Police: 925-943-5844
For professional investigations in the East Bay: Spade & Archer® — 415.715.1956