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- Canadian County (OK)
- Canadian Fertilizers Limited - Medicine Hat
- Canadian International Air Show Toronto County (ON)
- Canadian National Railway (MB)
- Canadian National Railway (ON)
- Canadian National Railways (AB)
- Canadian National Railways (BC)
- Canadian National Railways (MB)
- Canadian National Railways (NB)
- Canadian National Railways (NS)
- Canadian National Railways (NT)
- Canadian National Railways (QC)
- Canadian National Railways (SK)
- Canadian National Railways National Channel Plan
- Canadian Natural Resources Limited - Horizon
- Canadian Niagara Power
- Canadian Niagara Power RID/UIDs
- Canadian Pacific Railway (AB)
- Canadian Pacific Railway (BC)
- Canadian Pacific Railway (MB)
- Canadian Pacific Railway (ON)
- Canadian Pacific Railway (QC)
- Canadian Pacific Railway (SK)
- Canadian Surface Wave
- Cancun Businesses (QN)
- Cannon County (TN)
- Canyonlands National Park
- Cape Breton County (NS)
- Cape Girardeau County (MO)
- Cape May County (NJ)
- Cape May County (NJ) Bridges
- Cape May County (NJ) Fire Stations
- Cape May County Public Safety
- Capital Area (NY) Unknown Taxicabs
- Capital Area (NY) Unknown Transportation
- Capital Area Transportation Authority
- Capital County (BC)
- Capital Digitronics (Capital District Public Safety)
- Capital Digitronics (Capital District Public Safety) Site Information
- Capital Region Emergency Services Telecom (CREST)
- Capital Region Radio System
- Capitale-Nationale County (QC)
- Capitol City Airport (KFFT) Franklin County (KY)
- Capitol Reef National Park
- Carbon County (PA)
- Carbon County (PA) EMS ID's
- Carbon County (PA) EMS ID's and Tones
- Carbon County (PA) Fire Districts
- Carbon County (PA) Police ID's
- Carbon County (UT)
- Cardston County (AB)
- Carleton University
- Carleton University Unknown Talkgroups
- Carlsbad Caverns National Park (NM)
- Carlton County (MN)
- Carolina Connect
- Carolina Connect System Information
- Carolina Connect Unknown Talkgroups
- Caroline (VA) Radio IDs
- Caroline County
- Caroline County (MD)
- Caroline County (VA)
- Caron County (SK)
- Carroll County (AR)
- Carroll County (IA)
- Carroll County (IL)
- Carroll County (MD)
- Carroll County (MD) Dispatch Tones
- Carroll County (MO)
- Carroll County (MS)
- Carroll County (NH)
- Carroll County (OH)
- Carroll County (VA)
- Carson City (NV)
- Carter County (MO)
- Carter County (OK)
- Carter County (TN)
- Carteret County (NC)
- Carver County (MN)
- Carver County (MN) Radio IDs on ARMER
- Cary/Wake P25
- Cary/Wake P25 RID/UID Research
- Cary/Wake P25 TRS System Information
- Casa Grande Police Department (AZ)
- Case Corporation
- Case Corporation (IA) Unknown Talkgroups
- Casino Del Sol
- Casino Del Sol Source IDs
- Casino Del Sol Target IDs
- Casino Queen (E St. Louis)
- Casino Queen (E St. Louis) Talkgroup Research
- Casino Rama
- Casino Rama DMR Bandplan
- Casino Rama Unknown Talkgroups
- Casino Woodbine
- Casino Woodbine Unknown Talkgroups
- Cass County (IL)
- Cass County (MI)
- Cass County (MN)
- Cass County (MO)
- Cass County (ND)
- Cass County (NE)
- Cass County (TX)
- Cassidian Communications
- Cassidian Communications (Ottawa) Unknown Talkgroups
- Caswell County (NC)
- Cat-streamer
- Catahoula Parish (LA)
- Catahoula Parish (LA) Bridges
- Catawba County (NC)
- Categories-Tree
- Categories-Tree: Collaboration
- Categories-Tree: Equipment and Software
- Categories-Tree: Special Topics
- Categories-Tree Notes
- Catepillar Corporation (East Peoria) Unknown Talkgroups
- Caterpillar Corporation (East Peoria)
- Cathedral City (CA) Fire Department Stations
- Catoosa County (GA)
- Cattaraugus County (NY)
- Cattaraugus County (NY) Fire Tone Outs
- Cattaraugus County (NY) Firefighting
- Cattaraugus County Public Safety
- Cattaraugus County Public Safety Unknown Talkgroups
- Cayuga County (NY)
- Cayuga County (NY) Canal Locks
- Cayuga County (NY) Fire Tone Outs
- Cayuga County (NY) Firefighting
- Cayuga County (NY) PD
- Cecil County
- Cecil County (MD)
- Cecil County (MD) Bridges
- Cecil County (MD) Radio and Unit IDs
- Cecil County (MD) Unknown Talkgroups
- Cedar County (IA)
- Cedar County (MO)
- Cedar Rapids
- Cedar Rapids (IA) RID/UIDs
- Cedar Rapids (IA) Unidentified Talkgroups
- Cell blocked
- Cellular 90 - Sherwood Park
- Centennial Airport (KAPA) Arapahoe County (CO)
- CenterPoint Energy (MN)
- CenterPoint Energy (Minnesota)
- CenterPoint Energy (Minnesota) Unknown Talkgroups
- CenterPoint Energy Houston Electric (Motorola)
- CenterPoint Energy Houston Electric (Motorola) Radio/User IDs
- CenterPoint Energy Houston Electric (Motorola) Substation Lists and Map
- CenterPoint Energy Houston Electric (OpenSky)
- Center Grove Community School Corporation
- Center Grove Community School Corporation Radio IDs
- Central Communications Network (Orlando
- Central Communications Network (Orlando 2)
- Central Communications Network (Orlando 2) Unknown Talkgroups
- Central Georgia Interoperable Regional Radio System (CGIRRS)
- Central Georgia Interoperable Regional Radio System (CGIRRS) Unidentified Talkgroups
- Central Hudson NY
- Central Iowa Regional Public Safety Communications System (CIRPSCS)
- Central Kootenay County (BC)
- Central Maryland Area Regional Communications Committee (CMARC)
- Central Nevada Interagency Dispatch Center (NV)
- Central New York Interoperable Communications Consortium (CNYICC)
- Central New York Interoperable Communications Consortium (CNYICC) Radio IDs
- Central Ohio Interoperable Radio System (COIRS)
- Central Regional Interoperability Communication System (Central RICS)
- Central Regional Interoperability Communication System (Central RICS) Talkgroup Research
- Central Vermont Power
- Central Virginia Radio Communications System
- Central Wisconsin Airport (CWA) Marathon County (WI)
- Centre County (PA)
- Centre County (PA) Fire/EMS ID's
- Centre County (PA) Fire/EMS Sta. Locations
- Centre County (PA) Police ID's & 10-Codes
- Centre County Public Safety
- Centre County Public Safety Unknown Talkgroups
- Centre de Telephone Mobile (CTM) 14
- Centre de Telephone Mobile (CTM) 14 Unknown Talkgroups
- Cerro Gordo County (IA)
- Certificate of need (CON)
- Chaffee County (CO)
- Chain Municipal Airport (HBG) Forrest County (MS)
- Chambers County (TX)
- Champaign-Urbana
- Champaign County (IL)
- Champaign County (IL) Events
- Champaign County (OH)
- Champaign County METCAD MDICE
- Champaign County METCAD MDICE - 800 MHz
- Champaign County METCAD MDICE Radio IDs
- Champaign County METCAD MDICE Unknown Talkgroups
- Channel Alert
- Chariton County (MO)
- Charles City County (VA)
- Charles County
- Charles County (MD)
- Charles County (MD) Conventional Public Service
- Charles County (MD) Fire Services
- Charles County (MD) Law Enforcement
- Charles County (MD) TRS Information
- Charles County Public Safety
- Charles County TRS Radio Zones
- Charleston City Public Safety
- Charleston County (SC)
- Charleston County Public Safety
- Charleston Wireless Group/James White
- Charleston Wireless Group/James White Unknown Talkgroups
- Charlevoix County (MI)
- Charlevoix County (MI) Bridges
- Charlotte/Douglas International Airport (CLT) Mecklenburg County (NC)
- Charlotte County (FL)
- Charlotte UASI Region
- Charlotte UASI Region Radio IDs
- Charlotte UASI Region Site Information
- Charlottesville-Albemarle Airport (CHO) Albemarle County (VA)
- Charlottesville / Albemarle
- Charlottesville / Albemarle Radio IDs
- Charlottesville / Albemarle Unknown Talkgroups and Channels
- Charlottesville City (VA)
- Charlottetown Airport (YYG) Queens County (PE)
- Charlton County (GA)
- Charter Buses
- Chatham-Kent County (ON)
- Chatham County (GA)
- Chatham County (NC)
- Chattanooga Metropolitan Airport Hamilton County (TN)
- Chautauqua County (NY)
- Chautauqua County (NY) Firefighting
- Chautauqua County (NY) Law Enforcement
- Chautauqua County (NY) Unknown Trunking
- Chautauqua County Public Safety System
- Chautauqua County Public Safety Unknown Talkgroups
- Chaves County (NM)
- Cheboygan County (MI)
- Cheboygan County (MI) Bridges
- Chelan County (WA)
- Chemung County (NY)
- Chemung County (NY) Fire Tone Outs
- Chemung County (NY) Firefighting
- Chenango County (NY)
- Chenango County (NY) Fire Tone Outs
- Chenango County (NY) Firefighting
- Chenango County (NY) Law Enforcement
- Cherokee County (AL)
- Cherokee County (NC)
- Cherokee County (SC)
- Chesapeake
- Chesapeake (VA) P25 RID/UID's
- Chesapeake (VA) TRS Radio IDs
- Chesapeake (VA) TRS Station IDs
- Chesapeake City (VA)
- Cheshire County (NH)
- Chester County
- Chester County (PA)
- Chester County (SC)
- Chester County (TN)
- Chester County Emergency Services
- Chester County Emergency Services Radio and Unit IDs
- Chester County Emergency Services Unknown Talkgroups
- Chester County Fire Tone Outs
- Chesterfield County (SC)
- Chesterfield County (VA)
- Chesterfield County Airport (FCI) Chesterfield County (VA)
- Chevron Pascagoula Refinery
- Chevron Richmond Refinery
- Chevron Richmond Refinery Unknown Talkgroups
- Cheyenne City (WY) Fire FTO
- Cheyenne County (KS)
- Cheyenne Regional/Jerry Olson Field Airport (CYS) Laramie County (WY)
- Chicago (IL) F.D. Station Locations
- Chicago (ZAU) Air Route Traffic Control Center
- Chicago 2-Way, Inc. - UHF
- Chicago 2-Way - UHF
- Chicago Area Radio Monitoring Association (CARMA)
- Chicago Businesses & Retail Cook County (IL)
- Chicago Department of Aviation TETRA (O'Hare Airport)
- Chicago Midway Airport -- Department of Aviation - UHF-T
- Chicago Midway Airport - Department of Aviation - 800 MHz P25 Phase II RID/UIDs
- Chicago Midway International Airport (MDW) Cook County (IL)
- Chicago New P25 Conventional Radio IDs
- Chicago O'Hare Airport Public Safety
- Chicago O'Hare Airport Public Safety - 800 MHz
- Chicago O'Hare Airport TETRA
- Chicago O'Hare Airport TETRA Talkgroup Research
- Chicago O'Hare International Airport
- Chicago O'Hare International Airport (ORD) Cook County (IL)
- Chicago O'Hare International Airport - UHF-T
- Chicago OEMC Public Safety - 800 MHz P25
- Chicago Public Safety and Services
- Chick-Fil-A (Palm Beach Co.)
- Chickasaw County (MS)
- Chicot County (AR)
- Chief of Naval Air Training (CNATRA)
- Chinese 39 Tone Waterfall
- Chinese OTHR Waterfall
- Chippewa County (MI)
- Chippewa County (MN)
- Chippewa County (WI)
- Chisago County (MN)
- Chisago County (MN) Radio IDs on ARMER
- Chittenden County (VT)
- Choctaw County (MS)
- Chowan County (NC)
- Christian County
- Christian County (IL)
- Christian County (KY)
- Christian County (MO)
- Christian County 911 Emergency Services
- Christian County 911 Emergency Services Unknown Talkgroups
- Christian County Public Safety
- Christiana Care Health Services
- Christiana Care Health Services MOTOTRBO Research
- Chrysler Plant (Belvidere)
- Churches Simcoe County (ON)
- Cibola County (NM)
- Cimarron County (OK)
- Cincinnati/Northern Kentucky International Airport (CVG)
- Cincinnati/Northern Kentucky International Airport (CVG) Boone County (KY)
- Cincinnati/Northern Kentucky International Airport (CVG) Unknown Talkgroups
- Circuses
- Cirque du Soleil
- Citizens' band radio
- Citizens Band
- Citizens Band (CB) (US Nationwide)
- Citrus County (FL)
- CityWestPlace
- City and County of Honolulu P25 Public Safety System
- City of Albany (NY) Fire and Police
- City of Buffalo Law Enforcement
- City of Buffalo Public Safety
- City of Burlington (WI)
- City of Burlington (WI) Fire Department
- City of Catanduva (SP)
- City of Dayton
- City of Dayton (OH) Public Safety Communications
- City of Fort Worth (TX)
- City of Forth Worth (TX)
- City of Kenosha (WI) Fire Department
- City of Manchester
- City of Manchester Radio IDs
- City of Reading (PA)
- City of Salem Radio IDs
- Civil Air Patrol
- Civil Air Patrol (CA)
- Civil Air Patrol (CT)
- Civil Air Patrol (NC)