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- Ocean City
- Ocean City (MD) Radio/Unit IDs
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- Ocean City Municipal Airport (OXB) Worcester County (MD)
- Ocean City Police Channel Plan
- Ocean County
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- Ocean County (NJ) (Project 25) EMS Radio IDs
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- Ocean County (NJ) (Project 25) Unknown Radio IDs
- Ocean County (NJ) (Project 25) Unknown Unconfirmed Talkgroups
- Ocean County (NJ) Bridges
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- Ocean County (NJ) EMS TRS Radio ID's
- Ocean County (NJ) EMS Zone Assignments
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- Ocean County (NJ) Fire Coordinators
- Ocean County (NJ) Fire Department Zone Assignments
- Ocean County (NJ) Law Enforcement
- Ocean County (NJ) MONOC Paramedics
- Ocean County (NJ) Robert Wood Johnson Barnabas Mobile Health and Hackensack Meridian Health Paramedics
- Ocean County (NJ) TRS EMS Radio IDs
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- Ocean County (NJ) TRS Unknown Talkgroups
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- Ohare
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- Ohio (US)
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- Ohio County Public Safety
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- Ohio Department of Rehabilitation and Corrections (DRC) (OH)
- Ohio Department of Transportation (ODOT) (OH)
- Ohio Health - Central Ohio
- Ohio MARCS-IP: Multi-Agency Radio Communications
- Ohio MARCS-IP: Multi-Agency Radio Communications (P25)
- Ohio MARCS - Multi-Agency Radio Communications
- Ohio MARCS Conventional Systems (OH)
- Ohio MARCS IP: Ashtabula County Radio IDs
- Ohio MARCS IP: Brown County Radio IDs
- Ohio MARCS IP: Butler County Radio IDs
- Ohio MARCS IP: Chagrin Valley Dispatch Radio IDs
- Ohio MARCS IP: Chagrin Valley Dispatch Unit IDs
- Ohio MARCS IP: Clermont County Radio IDs
- Ohio MARCS IP: Clinton County Radio IDs
- Ohio MARCS IP: Cuyahoga County Radio IDs
- Ohio MARCS IP: Decommissioned Sites
- Ohio MARCS IP: Fairfield County Radio IDs
- Ohio MARCS IP: Fayette County Radio IDs
- Ohio MARCS IP: Franklin County Radio IDs
- Ohio MARCS IP: Future Sites
- Ohio MARCS IP: Geauga County Radio IDs
- Ohio MARCS IP: Hamilton County Radio IDs
- Ohio MARCS IP: Heights Hillcrest Communication Center Radio IDs
- Ohio MARCS IP: Hocking County Radio IDs
- Ohio MARCS IP: Lake County Radio IDs
- Ohio MARCS IP: Local Partnerships
- Ohio MARCS IP: Logan County Radio IDs
- Ohio MARCS IP: Madison County Radio IDs
- Ohio MARCS IP: Marion County Radio IDs
- Ohio MARCS IP: Medina County Radio IDs
- Ohio MARCS IP: Miami County Radio IDs
- Ohio MARCS IP: Montgomery County Radio IDs
- Ohio MARCS IP: Multi-Agency Radio Communications Radio ID Logic
- Ohio MARCS IP: Muskingum County Radio IDs
- Ohio MARCS IP: Northern Border Interop
- Ohio MARCS IP: ODNR Radio IDs
- Ohio MARCS IP: Ottawa County Radio IDs
- Ohio MARCS IP: Pickaway County Radio IDs
- Ohio MARCS IP: Pike County Radio IDs
- Ohio MARCS IP: Portage County Radio IDs
- Ohio MARCS IP: Preble County Radio IDs
- Ohio MARCS IP: Removed Sites
- Ohio MARCS IP: Richland County Radio IDs
- Ohio MARCS IP: Ross County Radio IDs
- Ohio MARCS IP: Site Map
- Ohio MARCS IP: Stark County Radio IDs
- Ohio MARCS IP: Statewide Radio IDs
- Ohio MARCS IP: Summit County Radio IDs
- Ohio MARCS IP: Trumbull County Radio IDs
- Ohio MARCS IP: Tuscarawas County Radio IDs
- Ohio MARCS IP: Unconfirmed Talkgroups
- Ohio MARCS IP: Union County Radio IDs
- Ohio MARCS IP: Vinton County Radio IDs
- Ohio MARCS IP: Warren County Radio IDs
- Ohio MARCS IP: Westcom Westshore Radio IDs
- Ohio MARCS IP: Wyandot County Radio IDs
- Ohio MARCS IP Westcom Westshore Radio IDs
- Ohio Medical Helicopters/MICU (OH)
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- Okaloosa County (FL)
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- Oklahoma(US)
- Oklahoma (US)
- Oklahoma City Metro Public Safety (P25)
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- Oklahoma State 700 MHz System
- Oklahoma Turnpike Authority
- Oklahoma Wireless Information Network
- Oklahoma Wireless Information Network (OKWIN)
- Oklahoma Wireless Information Network (OKWIN) - Tulsa Information
- Oklahoma Wireless Information Network (OKWIN) - Unconfirmed or Unidentified Frequencies
- Oklahoma Wireless Information Network (OKWIN) - Unconfirmed or Unidentified Talkgroups by Site
- Oklahoma Wireless Interoperability Network (OKWIN) (Motorola)
- Oklahoma Wireless Interoperability Network (OKWIN) (P25)
- Oklahoma Wireless Interoperability Network (OKWIN) Motorola
- Oklahoma Wireless Interoperability Network (OKWIN) Project 25
- Oktibbeha County (MS)
- Okwin
- Oldham County (KY)
- Olmsted County (MN)
- Olmsted County (MN) Radio IDs on ARMER
- Olympic National Park (WA)
- Omaha Fire IDs
- Omaha Regional Interoperability Network (ORION)
- OmniLink
- Omnilink
- On-Air Programming
- OnQ
- OnQ Network
- OnQue
- OnQue - Ontario Network
- OnQue - Réseau québécois
- OnQue Ontario Talkgroups and User IDs
- Oncor Energy
- Oncor Energy (EDACS)
- Oncor Energy (P25)
- Oncor Energy P25 System Radio User IDs
- Oncor Energy P25 System Site Research
- Oncor Energy P25 System Unknown Talkgroups
- Oncor Energy Radio User IDs
- Oncor Energy Unconfirmed Frequencies
- Oncor Energy Unknown Talkgroups
- Oncor P25
- OneVoice MAX
- OneVoice MAX Radio IDs
- OneVoice MAX Sites
- OneVoice MAX Unknown Talkgroups
- OneVoice Network
- OneVoice Network 1515 Broadway DMR Bandplan
- OneVoice Network 700 Victory DMR Bandplan
- OneVoice Network Alpine DMR Bandplan
- OneVoice Network Atlantic City DMR Bandplan
- OneVoice Network Austerlitz DMR Bandplan
- OneVoice Network Barnegat DMR Bandplan
- OneVoice Network Beacon DMR Bandplan
- OneVoice Network Belle Mead DMR Bandplan
- OneVoice Network Blooming Grove DMR Bandplan
- OneVoice Network Court Plaza DMR Bandplan
- OneVoice Network DMR Bandplans
- OneVoice Network Glen Oaks DMR Bandplan
- OneVoice Network Glen Spay DMR Bandplan
- OneVoice Network Half Hollow Hills DMR Bandplan
- OneVoice Network Hartford DMR Bandplan
- OneVoice Network Holmdel DMR Bandplan
- OneVoice Network Holyoke DMR Bandplan
- OneVoice Network Loomis DMR Bandplan
- OneVoice Network Mamakating DMR Bandplan
- OneVoice Network Manorville DMR Bandplan
- OneVoice Network Matamoras DMR Bandplan
- OneVoice Network Nepture DMR Bandplan
- OneVoice Network New Scotland DMR Bandplan
- OneVoice Network North East DMR Bandplan
- OneVoice Network North Salem DMR Bandplan
- OneVoice Network Philadelphia DMR Bandplan
- OneVoice Network Plainview DMR Bandplan
- OneVoice Network Pomona DMR bandplan
- OneVoice Network Putnam Valley DMR Bandplan
- OneVoice Network Radio IDs
- OneVoice Network Sag Harbor DMR Bandplan
- OneVoice Network Seldon DMR Bandplan
- OneVoice Network Site 1 DMR Bandplan
- OneVoice Network Site 22 DMR Bandplan
- OneVoice Network Site 24 DMR Bandplan
- OneVoice Network Site 40 DMR Bandplan
- OneVoice Network Site 42 DMR Bandplan
- OneVoice Network Site 43 DMR Bandplan
- OneVoice Network Site 44 DMR Bandplan
- OneVoice Network Site 45 DMR Bandplan
- OneVoice Network Site 46 DMR Bandplan
- OneVoice Network Site 47 DMR Bandplan
- OneVoice Network Site 51 DMR Bandplan
- OneVoice Network Site 52 DMR Bandplan
- OneVoice Network Site 53 DMR Bandplan
- OneVoice Network Site 54 DMR Bandplan
- OneVoice Network Site 55 DMR Bandplan
- OneVoice Network Unknown Radio IDs
- OneVoice Network Unknown Talkgroups
- OneVoice Network Valhalla DMR Bandplan
- OneVoice Network Warwick DMR Bandplan
- OneVoice Network Waterford Works DMR Bandplan
- OneVoice Network West Orange DMR Bandplan
- Oneida County (NY)
- Oneida County (NY) Canal Locks
- Oneida County (NY) Fire Tone Outs
- Oneida County (NY) Firefighting
- Oneida County (NY) Law Enforcement
- Oneida County (NY) Utica City
- Oneida County (NY) Utica City ICalls
- Oneida County (WI)
- Oneida Herkimer Madison School Cooperative
- Oneida Herkimer Madison School Cooperative Channel Map
- Oneida Herkimer Madison School Cooperative Radio IDs
- Oneida Herkimer Madison School Cooperative Spectrum Display
- Online amateur radio
- Onondaga County (NY)
- Onondaga County (NY) Amateur Radio Repeaters
- Onondaga County (NY) Canal Locks
- Onondaga County (NY) EMS
- Onondaga County (NY) Fire Tone Outs
- Onondaga County (NY) Firefighting
- Onondaga County (NY) Law Enforcement
- Onondaga County (NY) Syracuse City
- Onondaga County Interoperable Communication System (OCICS)
- Onslow County (NC)
- Ontario(CA)
- Ontario (CA)
- Ontario AD9
- Ontario Counties
- Ontario County (NY)
- Ontario County (NY) EMS
- Ontario County (NY) Fire Tone Outs
- Ontario County (NY) Firefighting
- Ontario County (NY) Law Enforcement
- Ontario County NY Unknown Users
- Ontario Government Law Enforcement Agencies
- Ontario Provincial Police (ON)
- Ontario Sports
- Ontonagon County (MI)
- OpenSky
- Opportunity County (AB)
- Orange, County of CCCS - Public Safety
- Orange Beach (AL) Public Safety System Unknown Talkgroups
- Orange Beach Public Safety System
- Orange County
- Orange County (CA)
- Orange County (CA) Ambulance Services
- Orange County (CA) Anaheim FD
- Orange County (CA) Brea FD
- Orange County (CA) Costa Mesa FD
- Orange County (CA) Fire Authority
- Orange County (CA) Fountain Valley FD
- Orange County (CA) Fullerton FD
- Orange County (CA) Garden Grove FD
- Orange County (CA) Holy Jim VFD
- Orange County (CA) Huntington Beach FD
- Orange County (CA) Laguna Beach FD
- Orange County (CA) Los Alamitos Joint Forces Training Base FD
- Orange County (CA) Newport Beach FD
- Orange County (CA) Orange FD
- Orange County (CA) Placentia FD
- Orange County (CA) Seal Beach Naval Weapons Sta. FD
- Orange County (FL)
- Orange County (FL) Fire/Rescue Zone Layout
- Orange County (FL) Orlando 10-Codes
- Orange County (FL) Orlando Zone Layout
- Orange County (FL) Radio IDs
- Orange County (FL) TRS Unknown Talkgroups
- Orange County (IN)
- Orange County (NC)
- Orange County (NY)
- Orange County (NY) Fire Tone Outs
- Orange County (NY) Firefighting
- Orange County (NY) Law Enforcement
- Orange County (TX)
- Orange County (VA)
- Orange County Public Services P25
- Orange County Public Services P25 Information
- Orange County Radio Network (CORNet)
- Orange County Radio Network (CoRNet)
- Orangeburg County (SC)
- Oregon(US)
- Oregon (US)
- Oregon - S. Washington Skywarn freqs
- Oregon Counties
- Oregon County (MO)
- Oregon Department of Forestry (OR)
- Oregon SAME Codes
- Oregon Sports
- Oregon State Radio Project
- Oregon State Radio Project Site Research
- Oregon State Radio Project Unknown Talkgroups
- Oregon Weather Information Radio
- Orizon Mobile
- Orlando Executive Airport (ORL) Orange County (FL)
- Orlando International Airport (900MHz Connect Plus)
- Orlando International Airport (900MHz Connect Plus) Unknown Talkgroups
- Orlando International Airport (MCO) Orange County (FL)
- Orleans County (NY)
- Orleans County (NY) Liftbridges
- Orleans Parish (LA)
- Orleans Parish (LA) Bridges
- Osage County (KS)
- Osage County (MO)
- Osage County (OK)
- Osceola County (FL)
- Osceola County (FL) Canal Locks
- Osceola County (IA)
- Osceola County (MI)