Lost something in Four Square Mile? Report it and keep searching.
One report connects you with the Arapahoe County Sheriff's Office, local lost and found channels, and active monitoring across Denver-area networks. Your report stays live.
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
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 Four Square Mile
You submit your loss details
Describe what you lost, where, and when. We gather the information needed to alert the right agencies and community channels in the Four Square Mile area and surrounding Arapahoe County.
We route your report to the right places
Your loss gets forwarded to the Arapahoe County Sheriff's Office, local transit lost and found systems, Denver-area police services, and active community networks. No back-and-forth calls on your part.
Your report keeps searching for you
For your entire search period, your report stays active and continues to match against new found items reported across local shelters, lost and found groups, and community posts. You get notified if a match appears, so you don't have to check every day.
Where to report lost items in Four Square Mile
The official channels we connect you with
Arapahoe County Sheriff's Office
File a lost property report directly with the county sheriff for the Four Square Mile area. We identify the right precinct and generate the exact report details you'll need when you call or visit in person.
RTD Lost and Found
If you lost something on a Denver Regional Transportation District bus, train, or other RTD service in the area, report it to their customer care team. We can help you pinpoint which route and provide details that speed up the search.
Report Lost Item Online|Call RTD Customer Care: 303-299-6000
Denver International Airport
Traveling through DEN? Their lost and found office is in the Jeppesen Terminal. File a report online or visit in person. We point you to the exact contact and hours so you don't waste a call.
Report at flydenver.com/lostandfound|Hours: Mon-Fri 8am-7:30pm, Sat-Sun 8am-6pm
Lost and Found Pets
If you've lost a cat, dog, or other pet in Four Square Mile, alert Denver Animal Shelter and Arapahoe County Animal Services right away. Time matters with pets. File a priority lost pet report
Community Networks
Denver and Arapahoe County residents actively share lost and found posts on Facebook groups and Nextdoor. We ensure your report reaches these channels too, so neighbors see what you're looking for.
⚠️ Spotted incorrect or outdated information? Let us know so we can review it.
The sooner you report, the sooner we search
Once your loss is in the system, the tracking begins. Don't wait weeks to report. Your report stays active and keeps working for you across all local channels, but getting started today gives you the best shot.
Report my lost item →Losing something in Four Square Mile and the surrounding Arapahoe County area means juggling calls to the Sheriff's Office, checking Denver transit lost and found, posting in multiple Facebook groups, and refreshing Nextdoor every day. The systems don't talk to each other, and your loss slips through the cracks while you're the one doing all the legwork.
ReportLost simplifies the whole process. File once, and we handle routing your report to county law enforcement, local transit, community networks, and animal services if needed. Then your report stays active and keeps searching for a match across all those channels, automatically, so you can focus on other things instead of playing detective every single day.
Common places people lose items in Four Square Mile
We help you report to the right location
Downtown Four Square Mile
Busy commercial streets and local shops. High foot traffic means quick reporting to local authorities.
Public Transit Stops and Routes
RTD bus stops and train stations throughout the area. Report to RTD customer care as well as county sheriff.
Parks and Recreation Areas
Open spaces where families and visitors gather. Community posts and neighborhood apps are key.
Shopping Centers and Retail Districts
Malls and stores where wallets, phones, and bags get left behind. Check store lost and found counters early.
Residential Neighborhoods
Nextdoor and local Facebook groups are your fastest allies for items lost near home.
Community channels in the Four Square Mile area
Where lost and found posts get the most visibility
Denver Lost and Found Pets, Arapahoe County community groups, and neighborhood-specific pages
Post to alert immediate neighbors and local residents monitoring the app
r/Denver and r/ColoradoSprings communities share lost and found tips
Dedicated platforms for lost pet alerts across Colorado
Questions about reporting a loss in Four Square Mile
How long does the Arapahoe County Sheriff's Office keep a lost property report active?
Most reports remain on file for a set period, typically several months. ReportLost keeps your report actively searching even longer, for up to 12 months, matching against new found items across all channels.
If I lose something on an RTD bus, how quickly can I file a report?
You can report online immediately at rtd-denver.com or call 303-299-6000. RTD customer care is available during business hours (8am-5pm weekdays). We help you collect the exact details you'll need when you call.
What if I lost something at Denver International Airport?
File a report immediately at flydenver.com/lostandfound. The airport's lost and found office is open Mon-Fri 8am-7:30pm and Sat-Sun 8am-6pm. Items are typically held for a limited time, so act fast.
How do I report a lost pet in Four Square Mile or Arapahoe County?
Contact Arapahoe County Animal Services at 720-874-6750 or visit the Denver Animal Shelter. Post immediately to lost pet Facebook groups and Nextdoor. ReportLost can file your pet report across all channels simultaneously.
Do I need to check back with the police or sheriff's office every week?
Not if your report is actively being tracked. ReportLost keeps your report live and matching against found items continuously for your entire search period. You'll be notified if a match appears, instead of chasing down leads yourself every day.
Is ReportLost affiliated with the Arapahoe County Sheriff or Denver police?
No, ReportLost is an independent service. We don't replace official police reports, but we streamline the process of filing with them and ensure your loss stays visible across all local lost and found channels. You're still filing with official agencies, we're just making it easier and keeping it active longer.
Lost & found in nearby cities
File your report and let it work for you
Every hour matters when something goes missing. Report now, and your loss immediately enters the search across Arapahoe County, Denver-area transit, airport systems, and community networks. Then you can rest, knowing your report stays active and searching for the next months, automatically.
Start my report →ReportLost is an independent service and is not affiliated with or endorsed by the Arapahoe County Sheriff's Office, City and County of Denver, RTD, Denver International Airport, or any local police department or government agency. We help you report your loss to these official channels and keep your report active across community networks, but you remain responsible for following up directly with authorities if needed. Always file a police report for stolen items or significant losses.