www.denvergov.org/311 or call "3-1-1", 7:00 am - 8:00 pm M-F, 8am-5pm S,S
Some example services include reporting pothole locations, animal control, recycling or trash missed pickups, court dates, snow removal reporting, zoning & permitting, city service inquiry
you can also use the Pocketgov app : go to https://www.denvergov.org/pocketgov/#/
You can use this app on your smartphone to submit an issue and attach a photo; your submittal will get a case number and you can even ask for resolution updates/ replies from the city be sent to your email.
call 720-913-2000 to report non-emergency "suspicious activity"
District 3, 1625 South University Blvd., 720-913-1300
District 4, Councilwoman Kendra Black, kendra.black@denvergov.org
3540 S Poplar St, Ste.100, Denver, CO 80227, 720-337-4444
www.denvergov.org/councildistrict4/
Some maps of various Denver recreational facilities are attached.