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- Businesses Herkimer County (NY)
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- Businesses Wayne County (MI)
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- Businesses and Media DuPage County (IL)
- Businesses and Media Kane County (IL)
- Businesses and Media Lake County (IL)
- Businesses and Media Rock Island County (IL)
- Businesses and Media Will County (IL)
- Businesses and Railroads Bureau County (IL)
- Butler County (KS)
- Butler County (KS) Apparatus
- Butler County (MO)
- Butler County (NE)
- Butler County (OH)
- Butler County (PA)
- Butler County (PA) Fire/EMS ID's
- Butler County (PA) Fire Tone Outs
- Butler Regional Interoperable Communications System (BRICS)
- Butler Regional Interoperable Communications System Radio IDs
- Butte County (CA)
- C0-Cabin Creek Sub
- C1-Coal Run Sub
- C2-Columbia Sub
- C3-Cumberland Terminal Sub
- C4-Creston Sub
- C4FM
- C6-Charlotte Sub
- C7-CN and L Sub
- C8-Chattanooga Sub
- C9-Castleton Sub
- C9-Corbin Terminal Sub
- CA-Camak Sub
- CAI
- CAP
- CARMA
- CAS
- CATV Interference
- CA ANG 144th Fighter Wing
- CB
- CBP
- CBP Nets
- CBP Office of Air and Marine
- CB Radio
- CC-CC Sub
- CCI
- CCIR493 Waterfall
- CCIR (selcall)
- CCR
- CCR Default Frequencies
- CCX
- CD-Cleveland Sub
- CDCSS
- CDM750
- CE-Willard Sub
- CENTRACOM Elite
- CFB Suffield
- CFB Suffield Unknown Talkgroups
- CGAS
- CH-Charleston Sub
- CHP200 Waterfall
- CIS11 Waterfall
- CIS14 Waterfall
- CIS3000 Waterfall
- CIS Mode Waterfalls
- CIS Modes
- CK Communications (DMR)
- CK Communications / MJM Electric Cooperative (DMR)
- CK Communications / MJM Electric Cooperative (DMR) Radio IDs
- CK Communications / MJM Electric Cooperative (DMR) System Details
- CL-CL and W Sub
- CLEMIS Public Safety Communications
- CM-Carman Sub
- CMARC Interoperability
- CMARC Radio IDs
- CMARC Unidentified Talkgroups
- CN-C and N Sub
- CNATRA
- CNY (Central/Eastern IL)
- CNY (Central/Eastern IL) Talkgroup Notes
- CN Rail (ON)
- CO-Carters Sub
- CODAN 16 Tone Waterfall
- CODAN Chirp Waterfall
- CODAR Waterfall
- CODEC
- COIRS: COIRS Radio IDs
- COIRS (Central Ohio Interoperable Radio System)
- COMSEC
- CONUS
- COTHEN
- CO Department of Transportation (CO)
- CO State Patrol (CO)
- CP-CE and D Sub
- CP200
- CPS
- CP Rail (ON)
- CQPSK
- CR-Coal River Sub
- CRESA 911
- CRH Canada - Holcim
- CRH Canada - Holcim Unknown Talkgroups
- CRTC
- CS-Columbus Sub
- CSV
- CSX-Albany Division
- CSX-Atlanta Division
- CSX-Baltimore Division
- CSX-Florence Division
- CSX-Great Lakes Div.
- CSX-Jacksonville Division
- CSX-Louisville Division
- CSX-Nashville Division
- CSX (AL)
- CSX (GA)
- CSX (MA) Hotbox Detectors
- CSX (PQ)
- CSX Railroad (FL)
- CSX Railroad (PA)
- CSX Transportation
- CT-Cincinnati Terminal Sub
- CTCSS
- CTM 09
- CT Interoperability (CT)
- CU-Cumberland Sub
- CV-CV Sub
- CVSD
- CW Waterfall
- CY-Columbus Line Sub
- CYHC Vancouver Harbour Greater Vancouver County (BC)
- CYVR Vancouver International Greater Vancouver County (BC)
- CZ-Cleveland Terminal Sub
- Cabarrus County (NC)
- Cabell County (WV)
- Cache County (UT)
- Caddo Parish (LA)
- Caesars Palace Hotel and Casino
- Caesers Palace Hotel and Casino Unknown Talkgroups
- Calcasieu Parish (LA)
- Calcasieu Parish (LA) Bridges
- Calcasieu Parish (LA) Pager Tones
- Caldwell County (MO)
- Caldwell County (NC)
- Caldwell County (TX)
- Caldwell Parish (LA)
- Caldwell Parish (LA) Bridges
- Caledonia (WI) Fire Department
- Caledonia (WI) Police
- Calgary County (AB)
- Calgary International Airport (YYC) Calgary County (AB)
- Calgary Municipal Radio Network
- Calgary Municipal Radio Network (Old)
- Calgary Municipal Radio Network (P25)
- Calgary Stampede Network
- Calgary Stampede Network Unknown Talkgroups
- Calhoun County (FL)
- Calhoun County (IL)
- Calhoun County (MI)
- Calhoun County (MS)
- Calhoun County (TX)
- California(US)
- California (US)
- California Counties
- California Health Care Facility
- California Health Care Facility Unidentified Talkgroups
- California Highway Patrol (CHP) (CA)
- California Radio Interoperable System (CRIS)
- California Radio Interoperable System (CRIS) Site Research
- California Sports
- California State University (Chico)
- Callaway County (MO)
- Callaway County (MO) Sheriff Dept.
- Calloway County (KY)
- Calumet County (WI)
- Calvary Baptist Church Main Campus
- Calvary Baptist Church Main Campus System Information
- Calvary Baptist Church Main Campus Unknown Talkgroups
- Calvert Cliffs Nuclear Power Plant
- Calvert Cliffs Nuclear Power Plant Radio IDs
- Calvert Cliffs Nuclear Power Plant Unknown Talkgroups
- Calvert County
- Calvert County (MD)
- Calvert County (MD) Fire Tone Outs
- Calvert County (P16)
- Calvert County (P25)
- Calvert County (P25) Radio IDs
- Calvert County (P25) Subscriber Channel Plan
- Calvert County (P25) Unknown Talkgroups
- Calvert County Radio IDs
- Calvert County Schools
- Calvert County Schools RID/UIDs
- Calvert County Trunking Information
- Cambria County (PA)
- Cambria County (PA) Fire/E.M.S. Sta. Locations
- Cambria County (PA) Fire/EMS ID's
- Cambria County (PA) Police ID's
- Cambria County (PA) Transit Authority Unit IDs
- Cambridge
- Cambridge Mass. Trunking System Radio IDs
- Camden County (MO)
- Camden County (NC)
- Camden County (NJ)
- Camden County (NJ) Bridges
- Camden County (NJ) Fire
- Camden County (NJ) Fire and EMS Radio IDs
- Camden County (NJ) Law Enforcement Radio IDs
- Camden County (NJ) Police
- Camden County (NJ) Public Safety Unidentified/Unconfirmed Talkgroups
- Camden County Public Safety
- Cameron County (PA)
- Cameron County (Port Isabel)
- Cameron County (South Padre Island)
- Cameron County (TX)
- Cameron Parish (LA)
- Cameron Parish (LA) Bridges
- Camp Bullis Bexar County (TX)
- Camp County (TX)
- Camp Lejeune / MCAS New River Onslow County (NC)
- Camp Lejeune Fire Stations
- Camp McCain Training Center (Army National Guard) Grenada County (MS)
- Camp Peary
- Camp Peary Trunk Research
- Camp Peary Unknown Talkgroups
- Camp Shelby Joint Forces Training Center
- Camp Shelby Joint Forces Training Center Forrest County (MS)
- Campbell County (KY)
- Campbell County (TN)
- Campbell County (VA)
- Campbell County (WY)
- Campbell County Board of Education
- Campbell County Board of Education Unknown Talkgroups
- Camrose County (AB)
- 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