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- Maricopa County (AZ) El Mirage FD
- Maricopa County (AZ) Fort McDowell Indian Reservation FD
- Maricopa County (AZ) Gila Bend VFD
- Maricopa County (AZ) Gila River Indian Community FD
- Maricopa County (AZ) Gilbert FD
- Maricopa County (AZ) Glendale FD
- Maricopa County (AZ) Goodyear FD
- Maricopa County (AZ) Guadalupe FD
- Maricopa County (AZ) Harquahala Valley FD
- Maricopa County (AZ) Life Line Ambulance
- Maricopa County (AZ) Luke AFB FD
- Maricopa County (AZ) Mesa FD
- Maricopa County (AZ) Peoria FD
- Maricopa County (AZ) Phoenix FD
- Maricopa County (AZ) Professional Medical Transport
- Maricopa County (AZ) Queen Creek FD
- Maricopa County (AZ) Rio Verde FD
- Maricopa County (AZ) Rural Metro FD
- Maricopa County (AZ) Salt River Indian Reservation FD
- Maricopa County (AZ) Scottsdale FD
- Maricopa County (AZ) Southwest Ambulance
- Maricopa County (AZ) Sun City FD
- Maricopa County (AZ) Sun City West FD
- Maricopa County (AZ) Sun Lakes FD
- Maricopa County (AZ) Surprise FD
- Maricopa County (AZ) Tempe FD
- Maricopa County (AZ) Tolleson FD
- Maricopa County (AZ) Tonopah Valley FD
- Maricopa County (AZ) Tonto Hills VFD Inc.
- Maricopa County (AZ) Wickenburg VFD Inc.
- Maricopa County (AZ) Wittmann VFD
- Maricopa County (P25) Unidentified Talkgroups
- Maricopa County Unknown Talkgroups
- Maries County (MO)
- Marin County (CA)
- Marin Emergency Radio Authority (MERA)
- Marin Emergency Radio Authority (MERA) RID UID List
- Marine
- Marine Channels (CA Nationwide)
- Marine Corps Base Camp Lejeune
- Marine Corps Base Quantico Prince William County (VA)
- Marine Frequencies (NY)
- Marine VHF Band Plans
- Marine VHF Channels
- Marineland of Canada
- Marinette County (WI)
- Marion County (AL)
- Marion County (FL)
- Marion County (IL)
- Marion County (IL) Public Safety
- Marion County (IN)
- Marion County (IN) Fire/EMS
- Marion County (IN) Police
- Marion County (KY)
- Marion County (MO)
- Marion County (MO) Bridges
- Marion County (MS)
- Marion County (OH)
- Marion County (OR)
- Marion County (TN)
- Marion County (WV)
- Marion County FL Public Safety
- Marion County FL Public Safety Talkgroup List
- Mariposa County (CA)
- Maritime (US Nationwide)
- Maritime Electric (PE)
- Maritime Public Safety Radio Network (MPSRN)
- Marquette County (MI)
- Marquette County (WI)
- Marriott Marquis (Washington)
- Marriott Marquis (Washington) DMR Bandplan
- Marriott Marquis (Washington) Unknown Talkgroups
- Marshall County (AL)
- Marshall County (IL)
- Marshall County (IN)
- Marshall County (KY)
- Marshall County (MN)
- Marshall County (MS)
- Marshall County (TN)
- Marshall County (WV)
- Martin County (FL)
- Martin County (FL) Drawbridges
- Martin County (IN)
- Martin County (MN)
- Martin County (MN) Radio IDs on ARMER
- Martin County (NC)
- Martin State Airport (MTN) Baltimore County (MD)
- Maryland(US)
- Maryland (US)
- Maryland Airport (2W5) Charles County (MD)
- Maryland Aviation Administration
- Maryland Aviation Administration Radio IDs
- Maryland Communications Companies
- Maryland Counties
- Maryland Eastern Shore Interoperability Network (MESIN)
- Maryland Live! Casino
- Maryland Live! Casino DMR Bandplan
- Maryland Live! Casino Unknown Talkgroups
- Maryland Renaissance Festival
- Maryland Sports
- Maryland State Police and the FiRST Migration
- Maryland Statewide Trunking Interoperability
- Maryland Statewide Trunking Interoperability Radio IDs
- Maryland Statewide Trunking Interoperability Talkgroup Research
- Maryland Transit Administration
- Maryland Transit Administration Codes
- Maryland Transit Administration Unit IDs
- Maryland Transportation Authority
- Mason County (IL)
- Mason County (KY)
- Mason County (MI)
- Mason County (WA)
- Mason County (WV)
- Massac County (IL)
- Massachusetts(US)
- Massachusetts (US)
- Massachusetts Counties
- Massachusetts Highway Department (MA)
- Massachusetts Railroads (MA)
- Massachusetts Sports
- Massachusetts State Police
- Massachusetts State Police/SOPS
- Massachusetts State Police Unit IDs Page 1
- Massachusetts State Police Unit IDs Page 2
- Massachusetts State Police Unknown Talkgroups
- Massport / Boston Logan International Airport
- Matagorda County (TX)
- Matanuska-Susitna County (AK)
- Mathews County (VA)
- Mathews County Fire/Rescue
- Mathews County Sheriff
- Matthews County Fire/Rescue
- Matthews County Sheriff
- Maui County (HI)
- Maury County (TN)
- Maverick County (TX)
- Mayes County (OK)
- Mayo Foundation - Clinic
- Mayo Foundation - Clinic Unknown Talkgroups
- Mazielka Waterfalls
- Mbelib
- McAllen-Miller International Airport (MFE) Hidalgo County (TX)
- McCarran International Airport (LAS) Clark County (NV)
- McClain County (OK)
- McCook County (SD)
- McCracken County (KY)
- McCreary County (KY)
- McCurtain County (OK)
- McCurtain County Regional Airport (4O4) -- Idabel McCurtain County (OK)
- McDonald County (MO)
- McDonalds
- McDonalds (Blair Co.)
- McDonalds (Cayuga Co.)
- McDonalds (Cortland Co.)
- McDonalds (Herkimer Co.)
- McDonalds (Jefferson Co.)
- McDonalds (Madison Co.)
- McDonalds (Montgomery Co.)
- McDonalds (Oneida Co.)
- McDonalds (Oswego Co.)
- McDonalds (Otsego Co.)
- McDonalds (Palm Beach Co.)
- McDonalds (San Carlos, CA)
- McDonalds (Tompkins Co.)
- McDonalds (Ulster Co.)
- McDonough County (IL)
- McDowell County (NC)
- McDowell County (WV)
- McDuffie County (GA)
- McGuire Air Force Base (WRI) Burlington County (NJ)
- McGuire Air Force Base / Fort Dix
- McHenry County (IL)
- McHenry County (IL) Fire/Rescue Locations
- McHenry County (IL) Law Enforcement IDs
- McHenry County (IL) Locks
- McKean County (PA)
- McKinley County (NM)
- McKinney National Airport (KTKI) Collin County (TX)
- McLean County (IL)
- McLennan County (TX)
- McLeod County (MN)
- McLeod County (MN) Radio IDs on ARMER
- McMinn County (TN)
- Meade County (SD)
- Mecklenburg County (NC)
- Mecklenburg County (NC) System Configuration
- Mecklenburg County (VA)
- Mecosta County (MI)
- MedCentral
- MedStar EMS (IL)
- Medevac (AL)
- Medevac (NJ)
- Medevac (NM)
- Medevac (NV)
- Medevac (PA)
- Medevac (TX)
- Medevac (WI)
- Media Cook County (IL)
- Media Harris County (TX)
- Media Miami-Dade County (FL)
- Media Montreal County (QC)
- Media Sangamon County (IL)
- Media Wayne County (MI)
- Medical Codes (NH)
- Medical Helicopters, MO
- Medical Helicopters (CO)
- Medical Helicopters (GA)
- Medical Helicopters (KS)
- Medical Helicopters (OK)
- Medical Helicopters (WA)
- Medical Helicopters / EMS Agencies (Area Wide) (MO)
- Medical Priority Dispatch System
- Medics Ambulance Service
- Medina County (OH)
- Meeker County (MN)
- Meeker County (MN) Radio IDs on ARMER
- Megahertz
- Megahertz DMR Tier 3
- Megahertz DMR Tier 3 Unknown Talkgroups
- Megahertz Technology
- Megahertz Technology Unknown Talkgroups
- Meigs County (OH)
- Memorial Health System - Springfield IL (NID-394)
- Memorial Health System - Springfield IL (NID-394) Radio IDs
- Memorial Hermann Memorial City Hospital
- Memphis/Shelby County Public Safety
- Memphis (ZME) Air Route Traffic Control Center
- Memphis Air Show
- Memphis International Airport (MEM) Shelby County (TN)
- Menard County (IL)
- Mendocino County (CA)
- Menominee County (MI)
- Menominee County (WI)
- Mercer County (IL)
- Mercer County (MO)
- Mercer County (NJ)
- Mercer County (NJ) Interoperable Public Safety Radio System - Support for out of production radios
- Mercer County (NJ) Interoperable Public Safety Radio System Radio IDs
- Mercer County (NJ) Interoperable Public Safety Radio System Unknown Unconfirmed Talkgroups
- Mercer County (OH)
- Mercer County (PA)
- Mercer County (WV)
- Mercer County Emergency Management Radio System
- Mercer County Interoperable Public Safety Radio System
- Merck DMR
- Merck DMR Unknown Talkgroups
- Mercy Flight (NY)
- Meridian/Key Field (MEI) Lauderdale County (MS)
- Merrick County (NE)
- Merrimack County (NH)
- Mesa County (CO)
- Metcalfe County (KY)
- Methodist Hospital
- Methodist Hospital (TX) DMR Bandplan
- Metro
- Metro-25/MTA MRRS
- Metro-25/MTA MRRS Radio IDs
- Metro-25/MTA MRRS Unknown Talkgroups
- MetroBus
- MetroFire Mutual Aid (MA)
- Metro -- MetroBus/MetroLink (Bi-State Development Agency) St. Louis County (MO)
- Metro Area Radio Cooperative (MARC)
- Metro Toronto Convention Centre
- Metro Toronto Convention Centre Unknown Talkgroups
- Metro Washington Council of Governments
- Metrocrest Quad Cities Public Safety Radio System
- Metrolinx - GO Transit
- Metrolinx - GO Transit Maps and System Description
- Metrolinx - GO Transit Talkgroups and Band Plan
- Metrolinx - GO Transit UIDs
- Metropolitan Detention Center Los Angeles
- Metropolitan Emergency Communications Agency (MECA)
- Metropolitan Entertainment Convention Authority
- Metropolitan Entertainment Convention Authority System Research
- Metropolitan Government Of Nashville and Davidson County (Motorola)
- Metropolitan Government Of Nashville and Davidson County (P25)
- Metropolitan Government of Nashville and Davidson County (Motorola) User IDs
- Metropolitan Government of Nashville and Davidson County (P25) User IDs
- Metropolitan PD, Wash DC
- Metropolitan Police (Defunct), MA Apparatus
- Metropolitan Police Department, Washington (DC)
- Metropolitan School District of Washington Township
- Metropolitan School District of Washington Township Talkgroup Research
- Metropolitan Transit Authority of Harris County MetroRail Unit IDs
- Metropolitan Transportation Authority (NY)
- Metropolitan Washington Airports Authority (MWAA) Monitoring
- Metropolitan Washington Airports Authority (Motorola)
- Metropolitan Washington Airports Authority (P25)
- MiWay (formerly Mississauga Transit)
- Miami-Dade County (FL)
- Miami-Dade County (FL) Amateur Radio Repeaters
- Miami-Dade County (FL) Apparatus
- Miami-Dade County (FL) Drawbridges
- Miami-Dade County (FL) Fire/Rescue/EMS Brevity Codes
- Miami-Dade County (FL) Fire/Rescue/EMS Stations and Tones
- Miami-Dade County (FL) Law Enforcement
- Miami-Dade County (FL) Miami City Public Safety Codes
- Miami-Dade County (FL) Public Services Unknown Talkgroups
- Miami-Dade County Public Services
- Miami (City) Public Safety
- Miami (ZMA) Air Route Traffic Control Center
- Miami County (EDACS)
- Miami County (OH)
- Miami Subs Grill (Palm Beach Co.)
- Miami Valley Gaming and Racing
- Michigan's Public Safety Communications System (MPSCS)
- Michigan's Public Safety Communications System (MPSCS) RIDs
- Michigan's Public Safety Communications System (MPSCS) Radio ID Structure
- Michigan's Public Safety Communications System (MPSCS) Zone Number
- Michigan(US)
- Michigan (US)
- Michigan Counties
- Michigan MilAir Reference
- Michigan Railroads (MI)
- Michigan Sports
- Michigan State Police
- Michigan State University
- Microwave
- Mid-Atlantic Digital Radio Network
- Mid-Atlantic Digital Radio Network Site Neighbor Information
- Mid-Atlantic Digital Radio Network Site Research and Color Codes
- Mid-Atlantic Digital Radio Network Unconfirmed Talkgroups
- Mid-Atlantic Digital Radio Network Unit IDs
- Mid-North Coast Security Companies Mid - North Coast (NC) Division (NSW)
- Mid - North Coast (NC) Division (NSW)
- Mid Air Operations
- Middle Tennessee Regional Trunked Radio System
- Middlesex County
- Middlesex County (CT)
- Middlesex County (CT) Fire Tone Outs
- Middlesex County (MA)
- Middlesex County (MA) Bridges
- Middlesex County (NJ)
- Middlesex County (NJ) Bridges
- Middlesex County (NJ) Edison Twp
- Middlesex County (ON)
- Middlesex County (VA)
- Middleton Field (GZH) Conecuh County (AL)
- Middletown
- Middletown Radio IDs
- Middletown Unknown Talkgroups
- Midland County (MI)
- Midland County (TX)
- Midland International Airport (MAF) Midland County (TX)
- Midwest League