Lost something in Walnut? Here is where to report it.
One report reaches the Walnut Sheriff's Station, City Hall, local lost pet resources, and active community channels. Your report stays active, keeping your loss in circulation while you move forward.
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 in Walnut
You report your loss
Tell us what you lost, where, and when. We capture all the details the Sheriff's Station, City Hall, and local groups need to help.
We route it to the right places
Your report goes directly to the Walnut/Diamond Bar Sheriff's Station, relevant city departments, animal services (if applicable), and the community channels where Walnut residents search for lost items.
Your report keeps searching for you
For your entire search period, your report continues to match against new found item posts, local social channels, and lost pet databases. You'll get an alert if a credible match appears, so you don't have to check every group and site yourself every day.
Where to report in Walnut
Key places to contact, and what ReportLost does for you
Walnut/Diamond Bar Sheriff's Station
The local law enforcement office handles lost and stolen property reports. We tell you which location covers your loss and generate the exact information to include in your report.
Walnut Station: (909) 595-2264|Address: 21695 E. Valley Blvd, Walnut, CA 91789
Walnut City Hall
City departments and administrative offices sometimes receive reports of found items or can direct you to the right channel. We ensure your report reaches the appropriate desk.
Phone: (909) 595-7543|21201 La Puente Road, Walnut, CA 91789
Lost Pet Resources
If you've lost a dog or cat, Walnut Animal Control and the Los Angeles County Department of Animal Care and Control (DACC) maintain databases of found pets. We help you report to the right shelter and connect to community pet recovery networks. If you've lost a pet, file a priority lost pet report with ReportLost for faster reach to local rescues and shelters.
Community Groups & Social Channels
Walnut residents use Facebook groups, Nextdoor, and local Reddit communities to post and find lost items. We alert these channels and monitor them for matches throughout your search period.
⚠️ Spotted incorrect or outdated information? Let us know so we can review it.
Don't let your lost item fade into the background
The sooner you file a report, the fresher the trail. Once submitted, you've done the hard work — our team takes it from there, and your report continues to hunt for matches while you get back to your day.
Report my lost item →Losing something in Walnut can mean contacting the Sheriff's Station, checking City Hall, visiting animal control if it's a pet, and posting across multiple Facebook groups and Nextdoor all on your own. Each agency keeps separate records, and community posts come and go. By the time you've called everyone, hours have passed.
ReportLost bridges that gap. File one report with us, and we make sure the Walnut/Diamond Bar Sheriff's Station, City Hall, and local lost pet resources have your information. More importantly, your report doesn't stop searching after you hit 'submit' — it stays active and continues to look for a match across community channels for months, alerting you the moment something credible surfaces. You can breathe easier knowing the search is ongoing.
Common places where Walnut residents lose items
We route your report to the right neighborhoods and neighborhoods nearby
Downtown Walnut & Valley Boulevard Corridor
The main commercial and civic hub, including City Hall, local shops, and the Sheriff's Station. High foot traffic and multiple transit touchpoints.
La Puente Road Area
Residential and mixed-use neighborhoods near City Hall and community centers, common for lost items during shopping and errands.
Walnut Parks & Recreational Spaces
Parks, playgrounds, and open spaces where personal items are frequently left behind during outdoor activities.
Residential Neighborhoods
Surrounding communities where items go missing during moves, delivery, or neighbor interactions.
How the Walnut community helps
Where locals post found items and help reunite people with their belongings
Walnut area lost and found and community pages, including neighborhood-specific lost and found groups
Hyperlocal posts from your immediate neighbors and nearby residents
r/bayarea, r/lostpets, and general lost & found subreddits with California users
Dedicated lost pet database for the Walnut area
Questions about losing and finding items in Walnut
How long does the Sheriff's Station keep lost and found property?
Items held by the Walnut/Diamond Bar Sheriff's Station are typically retained for a set period before disposition. Contact the Sheriff's Station at (909) 595-2264 to ask about their current retention policy and to check if your specific item has been turned in.
Can I file a lost item report online with the Walnut Sheriff's Department?
For certain items like cell phones valued at $950 or less, the Los Angeles Sheriff's Department (LASD) allows online reports via their SORTS system at LASD.org. For other items, you'll need to contact the Walnut/Diamond Bar Sheriff's Station directly at (909) 595-2264.
Where do I claim a lost item after it's found?
Lost items turned in to law enforcement are typically claimed at the precinct where they were reported or found. For items lost on a bus or in a public facility, contact that entity directly. ReportLost helps you coordinate with the right location so you know exactly where to go.
What should I do if I lost a pet in Walnut?
Contact the Walnut Animal Control office, file a lost pet report with the LA County Department of Animal Care and Control (DACC), and post to local pet recovery groups and Facebook pages immediately. ReportLost's lost pet reporting system fast-tracks your report to these channels and keeps searching across shelter databases and community networks for your entire search period.
How do I report a lost item to Walnut's community channels?
You can post directly to Walnut-area Facebook groups, Nextdoor, or local Reddit communities. However, ReportLost takes your report and ensures it reaches the right official channels (Sheriff's Station, City Hall) and community groups simultaneously, saving you time and maximizing visibility.
Is ReportLost.org official, and does it replace the police?
ReportLost is an independent service that works alongside the Walnut Sheriff's Station and other official channels, not a replacement for them. We ensure your report reaches law enforcement and local agencies, and we keep your report active in the community and across lost item databases for 12 months. You're not bypassing the system — you're making sure it works harder for you.
Lost & found in nearby cities
Your report is waiting to be filed
The longer an item remains lost, the less likely it is to make its way back to you. A quick report now means the Sheriff's Station, City Hall, animal control, and the Walnut community are all looking. Start your report, and let ReportLost handle the rest.
Start my report →ReportLost.org is an independent service and is not affiliated with the Walnut Sheriff's Station, City of Walnut, Los Angeles County Department of Animal Care and Control, or any other government or private agency mentioned on this page. We are not law enforcement and do not handle official police reports. We route your report to the appropriate official channels and monitor community platforms to help increase the chances of your lost item being returned to you. Always file an official police report directly with the Sheriff's Station if your item was stolen rather than lost.