Lost something in Castro Valley? Here are the offices that take your report.
Submit one report and we route it to the Alameda County Sheriff's Office, AC Transit lost and found, local animal services, and active community channels. Our team monitors the web continuously to match your item with found posts.
What did you lose?
If there isn’t an adequate suggestion, select “Other – My item isn’t listed” and enter the item’s category. You can provide details later.
Publishing your report is free and your details stay private. The assisted search is a separate paid service, described in the Terms.
Recent activity
California : found property must be held by law enforcement for at least 90 days before it can pass to the finder, be auctioned or disposed of. (California Civil Code §2080.2)
Across the United States
- Wrislet clutch gray/silver bag with documents · Chicago, IL, October 8
- Ring TM on top · Greensboro, NC, October 8
- Keys · Sarasota, FL, October 8
- Keys · Brookline, MA, October 7
- Camera · Monterey, CA, October 7
Local contact details reviewed on October 7, 2026.
How ReportLost Works
You report what you lost
Tell us the item, where and when you lost it, and any details that would help someone recognize it. No forms to fill out separately, no guessing which agency to call first.
We route it to the right places
We notify the Alameda County Sheriff's Office, AC Transit if it's a bus item, local animal control if it's a pet, and the community groups where Castro Valley residents report finds. You don't have to make those calls.
Automated monitoring finds matches for you
Our system scans Facebook groups, Nextdoor, local marketplace posts, and web listings every day, cross-referencing descriptions, locations, and dates. You get alerted the moment a credible match appears, so you're not refreshing pages yourself.
Where to Report a Loss in Castro Valley
If you prefer to contact these services directly, here's what to do.
Alameda County Sheriff's Office
For lost or stolen items, call the non-emergency line or file an online report. We identify which precinct covers your loss location and generate the exact information to include in your report.
AC Transit Lost and Found
If you left something on a bus, AC Transit holds items for a period. You can search their inventory online or submit a lost item form. We notify them on your behalf and follow up with their recovery timeline.
Search AC Transit Lost and Found|Report Lost Item: (510) 891-4777
Lost Pets
If your pet is missing, the East Bay SPCA, Alameda County Animal Services, and local rescue groups in Castro Valley are your first contacts. Lost pet posts spread quickly through Facebook groups and Nextdoor in your area. file a priority lost pet report with ReportLost for faster community reach and continuous monitoring.
East Bay SPCA Lost & Found|Alameda County Animal Services: (925) 803-7040
City of Castro Valley
Castro Valley is an unincorporated community in Alameda County, so the county sheriff and municipal advisory council handle local services. We point you to the right desk if your loss involves a specific city facility or service.
⚠️ Spotted incorrect or outdated information? Let us know so we can review it.
The sooner you report, the sooner we search.
The first hours and days are critical for lost items. Getting your loss into the system now and triggering our automated web monitoring immediately increases the chance of recovery. Once you file, the work of connecting you with finders continues automatically.
Report my lost item →Castro Valley's lost-and-found landscape spreads across several channels, the Alameda County Sheriff's Office for theft or loss reports, AC Transit for items left on buses, the East Bay SPCA and local animal shelters for pets, and scattered Facebook groups where neighbors post finds. Piecing together where your item went and checking back daily is exhausting and often fruitless.
ReportLost streamlines that chaos. One report tells the sheriff's office, transit authority, animal services, and the community all at once, and our team keeps searching the web on your behalf for months. You can breathe easier knowing the right people have been notified and a continuous watch is running for your item.
Common Places to Lose Something in Castro Valley
These neighborhoods and zones account for most loss reports in the area.
Castro Valley Boulevard Corridor
The main commercial strip is busy with shopping, dining, and foot traffic. Items are frequently left behind in stores, restaurants, and parking areas.
Center Street & Downtown
The civic and commercial heart, with city offices, local businesses, and high pedestrian volume. Lost items often surface in shops and service locations here.
Crow Canyon & Norris Canyon Road
Residential and recreational areas where people hike, walk pets, and commute. Items are lost along these roads and in nearby parks.
Public Transit Hubs
AC Transit bus stops and transfer points across Castro Valley see a steady stream of lost wallets, phones, and bags left on vehicles.
Cull Canyon Regional Preserve
A popular park for outdoor activities where personal items, keys, and pet identification are frequently misplaced or left behind.
Community Channels Where Finds Get Posted
Castro Valley residents use these platforms to report found items and help each other.
A general community group where neighbors post lost and found items, lost pets, and requests for help.
Dedicated to reuniting lost and found pets with their owners. Posts include photos, location, and contact info.
Bay Area residents, including those from Castro Valley, post found items and lost pet alerts here.
Neighborhood-level platform where Castro Valley residents report found items and coordinate local help.
Frequently Asked Questions
How long does AC Transit hold lost items?
AC Transit typically holds recovered items for a period before disposal. Recovered items take 2-3 business days to be logged into their system. Submit your lost report as soon as possible and contact them at (510) 891-4777 to check status.
What should I include when filing a police report for a lost item?
Provide a clear description of the item, the date and location where you lost it, any distinguishing marks or serial numbers, and your contact information. For valuable items, include photos if available. ReportLost generates the details needed based on your initial report.
How do I check if my lost pet is at a local shelter?
Contact the East Bay SPCA at (510) 337-8565 or Alameda County Animal Services at (925) 803-7040. They can check their intake records. Many shelters also list found pets on their websites and Petkey.org. Filing a priority lost pet report with ReportLost accelerates community alerts.
Can I file a police report online for a lost item in Castro Valley?
Yes. The Alameda County Sheriff's Office accepts online reports for lost property. Visit their website or call (510) 667-7721 for non-emergency assistance. ReportLost handles the submission process and routing for you.
Do I need to check multiple Facebook groups and Nextdoor daily for found items?
Not with ReportLost. Our automated system monitors these community channels, marketplaces, and the wider web continuously for 12 months, searching for matches to your item. You receive an alert when a credible match is found, saving you hours of manual searching.
Is ReportLost.org official or does it replace the police?
ReportLost is an independent service that complements official channels. We are not affiliated with law enforcement or government agencies. We handle the coordination and continuous monitoring on your behalf, ensuring your report reaches the right agencies and that the community is alerted. You still own the process, and we make it faster and more thorough.
Lost & found in nearby cities
Ready to find your lost item?
The faster you report, the faster our team gets to work. One form, multiple agencies notified, and continuous web monitoring that runs for months without you lifting a finger.
Start my report →ReportLost is an independent service and is not affiliated with the Alameda County Sheriff's Office, AC Transit, the East Bay SPCA, Alameda County Animal Services, or any other government or private entity mentioned. We coordinate with these agencies and services on your behalf, but are not authorized to file official reports or access their internal systems. Your report is processed by ReportLost, and we handle notification and follow-up. For emergencies, contact 911 directly.