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- Newton County (GA)
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- Nexen
- Nexen - Kinosis
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- Niagara Region Unknown Talkgroups
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- Nissan Stadium
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- Non-standard Pairs
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- Norman County (MN)
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- Nortex Regional Repeater System
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- North Carolina VIPER
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- North Carolina VIPER (Type II)
- North Carolina VIPER (Type II) Radio IDs
- North Carolina VIPER (Type II) TalkGroup ID Ranges
- North Carolina VIPER Counties Verified
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- North Cascades National Park Complex (WA)
- North Dakota(US)
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- North Dakota Counties
- North Dakota Statewide Interoperable Radio Network
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- North Miami Beach
- North Miami Beach 1
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- North Miami Beach Unknown Talkgroups
- North Queensbury Emergency Squad
- North Queensbury Vol. Fire Co.
- North Texas Interoperable Radio Network (NTIRN)
- North Texas Interoperable Radio Network Radio IDs
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- Northampton Co. (PA) Fire/E.M.S. Sta. Locations
- Northampton County (NC)
- Northampton County (PA)
- Northampton County (VA)
- Northeast Missouri Electric Power Cooperative
- Northeast Missouri Electric Power Cooperative (DMR)
- Northeast Missouri Electric Power Cooperative (DMR) RID/UIDs
- Northeast Missouri Electric Power Cooperative (DMR) Site Research
- Northeast Tarrant County
- Northeast Tarrant County Talkgroups
- Northeast Tarrant County Unit Numbering Scheme
- Northeast Utilities
- Northern Illinois Police and Fire Unit IDs
- Northern Indiana Public Service Company (NIPSCO 900MHz)
- Northern Indiana Public Service Company (NIPSCO 900MHz) Site Research
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- Northwest Alabama Regional Airport (MSL) Colbert County (AL)
- Northwest Ohio Regional Public Safety System
- Northwest Ohio Regional Public Safety System Radio IDs
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- Northwest Territories (CA)
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- Nothing to Scan
- Nova Chemicals
- Nova Chemicals Unknown Talkgroups
- Nova Scotia(CA)
- Nova Scotia (CA)
- Nova Scotia Integrated Mobile Radio System
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- Nova Southeastern University
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- OB-Orangeburg Sub
- OD-Old Road Sub
- OH ANG 112th Fighter Squadron/180th Fighter Wing
- OKWIN
- OKWIN -- Oklahoma Wireless Interoperability Network
- OKWIN -- Oklahoma Wireless Interoperability Network Project 25
- OM-Old Main Line Sub
- OMEPS Acetyls - Naperville IL
- ON-O and N Sub
- ONEOK -- Oklahoma Natural Gas
- OP25
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- OR-Ohio River Sub
- Oak Ridge National Laboratory
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- Oakland County (MI)
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- Oakland EDACS
- Oakville-Trafalgar Memorial Hospital
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- Oakville City Services
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- Oakville City Services Unknown Talkgroups
- Oakville Connect Plus (264)
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- Object Oriented Scanner Software
- Object Oriented Scanners Issues
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- Occupy Wall Street 2011
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- Ocean City Municipal Airport (OXB) Worcester County (MD)
- Ocean City Police Channel Plan
- Ocean County
- Ocean County (NJ)
- 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) Fire/EMS Locations
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- Ocean County (NJ) Fire Coordinators
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- 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
- Ocean County (P25)
- Ocean County (Project 25)
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- Office Buildings Harris County (TX)
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- Official Feeds
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- Offset
- Offutt Air Force Base (OFF) Sarpy County (NE)
- Ogden Hinckley Airport (KOGD) Weber County (UT)
- Ogemaw County (MI)
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- Ohare
- Ohio(US)
- Ohio (US)
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- Ohio County (WV) Public Safety TRS Unknown Talkgroups
- Ohio County Public Safety
- Ohio Department of Natural Resources (ODNR) (OH)
- 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)
- Ohio Milcom Frequencies
- Ohio Railroads (OH)
- Ohio Renaissance Festival Warren County (OH)
- Ohio Sports
- Ohio State Highway Patrol (OSP) (OH)
- Ohio Turnpike Commission (OTC) (OH)
- OilField Services (OK)
- Oil and Gas Production (TX)
- Oil spill cleanup
- Okaloosa County (FL)
- Okanagan-Similkameen County (BC)
- Okanogan County (WA)
- Okeechobee County (FL)
- Oklahoma(US)
- Oklahoma (US)
- Oklahoma City Metro Public Safety (P25)
- Oklahoma Counties
- Oklahoma County (OK)
- Oklahoma Department of Transportation
- Oklahoma Department of Transportation (ODOT)
- Oklahoma Interoperability (OK)
- Oklahoma Sports
- 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