Scanner Frequencies
Montgomery County, Maryland

This site is no longer being maintained since I no longer live in Montgomery County. However, the site will remain on-line for reference and historical purposes.

>>> Montgomery County's new trunked radio system is in use for all police and fire/EMS communications. You can find more information at radioreference.com (free registration required). Trunker data files are also available. Also see radioreference.com for current Montgomery County conventional frequencies.

>>> Real [Bizarre] Police and Fire/Rescue Dispatch/Operations

Legend of Remarks:
All frequencies in MHz unless otherwise noted.
* - frequency unverified by me
** - description unverified by me
D - duplex
I - repeater input
M - mobile/portable only, low power simplex
R - repeater output
S - simplex (dispatch only, unless close)
[xxx.x] - Continuous Tone Coded Squelch System (CTCCS) tone (Hz)
[None] - No CTCSS
[d xxx] - Digital Coded Squelch (DCS) code
[CSQ] - Carrier Squelch (no CTCSS/DCS)

Montgomery County Police

Channel Frequency Description Remarks
1 494.7125 Rockville District (Sectors A, B, C) R/M [156.7]
2 494.8625 Bethesda District (Sectors D, E) R/M [156.7]
3 494.9125 Silver Spring District (Sector G) R/M [156.7]
4 495.3125 Wheaton-Glenmont District (Sectors J, K) R/M [156.7]
5 495.3375 Germantown District (Sectors M, N, P) R/M [156.7]
6 495.3625 Secondary (Car-to-Car)/Tactical - South R/M [156.7]
7 495.3875 Secondary (Car-to-Car)/Tactical - North R/M [156.7]
8 495.4125 Simulcast of Channel 3 R/M [156.7]
9 495.2375 Rockville City Police R/M [156.7]
10 494.4625 Special Investigations Division (SID) R/M [156.7]
11 490.4375 Surveillance ("Tac 11") R/M [156.7]
12 490.7125 Surveillance ("Tac 12") R/M [156.7]
Others 490.5875 
853.6625 
854.9625
ERT/SWAT Operations 
Mobile Data Terminals - South 
Mobile Data Terminals - North
M [156.7]
Data*
Data*

Montgomery County Fire/Rescue

Channel Frequency Description Remarks
1 153.95 Fireground/Alternate S [156.7]
2 154.16 Dispatch/Operations R [156.7]
3 155.52 Investigations/Fireground/Alternate S [156.7]
4 155.1 Montgomery County Government Net F-1 S [156.7]
5 155.34 Fireground/Alternate (formerly "EMS 1") S [156.7]
6 154.16 Talk-around (simplex channel 2) M [156.7]
7 153.95 Potomac River/Metrorail Tunnel Operations (repeated channel 1) R [156.7]
8 155.985 Montgomery County Government Net F-2 S [156.7]
9 154.28 Mutual Aid 2 (Base-to-Base and Fireground: Frederick, Prince George's, Howard, Carroll, Washington, Baltimore, Fairfax, DC, Anne Arundel) S [CSQ]
10 153.95 Potomac River Operations (obsolete, channel 7 now used) R
11 154.25 Howard County F-1 (Dispatch/Operations) R [103.5]
12 154.22 Howard County F-2 (Fireground) S [103.5]
13 154.19 District of Columbia Digital Trunk Dispatch Simulcast R [77.0]
14 154.235 District of Columbia Old F-2 (EMS/Fireground) S [77.0]
15 154.205 District of Columbia Old F-4 (Fireground) S [77.0]
16 154.265 Mutual Aid 3 (Northern Virginia) S [CSQ]
Others 154.295 
154.355 
154.71 
154.83 
33.04
Mutual Aid 1 (Base-to-Base: DC Metro Area F-MARS
Smart-Status Messaging Terminals (SMTs) 
Paired with 154.16 
Paired with 153.95 
Bethesda-Chevy Chase Rescue Squad
S [CSQ] 
Data 
I [156.7] 
I [156.7] 
S [CSQ]

EMRC Region 5 Hospital Consultations

Channel Frequency Description Remarks
31 463.0 Med-1 D [192.8]
32 463.025 Med-2 D [192.8]
35 463.1 Med-5 D [192.8]
40 462.975 Med-10 (Call-2) D [192.8]
 

Medevac Helicopters

  • Maryland State Police Trooper Helicopters
  • MedSTAR Helicopters: 462.975 (D) [203.5]
  • AirCare Helicopters: 462.975 (S) [94.8]
  • Medevac Consultation with Childrens Hospital: 462.975 (D) [167.9]

Hospital Mutual Aid Radio System (H-MARS)

  • DC Hospitals: 462.4 (R) [77.0]

Police Mutual Aid Radio System (P-MARS)

  • DC Metro Area P-MARS Frequency: 866.3625 (R) [156.7]
  • P-MARS Participating Agencies
  • Baltimore Area "Metro" Police Mutual Aid: 460.05 (S) [114.8]

Localities
 
City Frequency Description Remarks
Chevy Chase Village 494.3625 Police (see County Police 9-Mary units) S*
Gaithersburg 155.655 Police Car-to-Car (see County Police 9-Delta units) S [156.7]
156.24 Public Works S [77.0]
Rockville 495.2375 Police (this is County Police channel 9) R [156.7]
155.76 Public Works - Channel 1 - Operations S [107.2]
155.745 Public Works - Channel 2 - Alternate S [107.2]
Takoma Park 488.3625 Police - Channel 1 - Dispatch/Operations R [100.0]
488.3875 Police - Channel 2 - Alternate R [100.0]

Montgomery County Park Police (M-NCPPC)

Channel Frequency Description Remarks
1/3 151.28 Dispatch/Operations R/M [118.8]
2 151.34 Park Operations/Maintenance (including Snow Plows) S [118.8]
Other 151.16 Paired with 151.28 I [118.8]

Montgomery County Sheriff

Montgomery County Detention Center (MCDC) Montgomery County Government
Channel Frequency Description Remarks
1 155.1 Animal Control/Humane Society; Environmental Protection; Building Code Inspectors S [156.7]
2 155.985 County Security; Facilities & Services Division of Public Works S [156.7]

Maryland State Police Troopers (MSP)

Frequency Description Remarks
39.1 Statewide ("MSP 1") S [110.9]
39.26 College Park - Barrack "Q" (Prince George's County) S [110.9]
39.3 Forestville - Barrack "L" (Prince George's County) S [110.9]
39.32 Rockville - Barrack "N" (Montgomery County) S [110.9]
39.4 Frederick - Barrack "B" (Frederick County) S [110.9]
39.42 Waterloo - Barrack "A" (Howard County) S [110.9]
39.66 Criminal Investigations Division (CID) S*
44.74 SysCom (Trooper Helicopter Operations) S [110.9]
44.9 Emergency Management S*
155.73 Mobile Extender (Portable Channel 1) M [110.9]
155.475 Nationwide Police Channel (Portable Channel 2) M
155.19 Barrack-to-Barrack (Portable Channel 3) S [173.8]

Maryland Emergency Management Agency (MEMA)

Maryland Dept. of Natural Resources (DNR) Police

Frequency Description Remarks
151.205 Dispatch/Operations R [118.8]
159.24 Paired with 151.205 I

Maryland DNR Forest, Park and Wildlife Service

Channel Frequency Description Remarks
1 151.460 Forestry - Eastern/Western S [114.8]
2 151.325 Parks/Enforcement - Eastern/Western S [114.8]
3 151.145 Forestry/Parks - Statewide S [114.8]
4 151.355 Forestry - Central S [114.8]
5 151.415 Parks/Enforcement - Central S [114.8]
6 151.250 Forestry - Southern S* [114.8]
7 151.310 Parks/Enforcement - Southern S [114.8]
8 159.285 Forest Fire Common S*
Other 159.45 Parks Statewide (Base: Tawes/Long Hill) R [114.8]
159.405 Paired with 159.45? I*
154.28 Fire Mutual Aid (ID: Long Hill) S [CSQ]

Montgomery County Public Schools (MCPS)

Channel Frequency Description Remarks
1 155.1 School Bus Operations - North
(Clarksburg, Shady Grove Depots)
School Maintenance - North (including Snow Plows)
S [156.7]
2 155.805 School Bus Operations - South
(Bethesda, Randolph, West Farm Depots)
School Maintenance - South (including Snow Plows)
S [156.7]

MCPS Schools/Facilities

Channel Frequency Description Remarks
1 464.375 Security/Administration M
2 464.55 Building Services/Alternate M

Metrorail (WMATA)

Channel Frequency Description Remarks
1 160.26 Ops-1 (Operations Control Net - Red Line) S [CSQ]
2 160.38 Ops-2 (Operations Control Net - Blue/Orange Lines) S [CSQ]
3 160.62 Ops-3 (Operations Control Net - Blue/Yellow/Green Lines) S [CSQ]
4 161.025 Maintenance/Paging S
5 161.235 Yards S
6 160.605 Yards S
7 161.415 Ops-7 Start-Up (Yard Control Net) S [CSQ]

Metro Transit Police (WMATA)

Channel Frequency Description Remarks
1/2 161.385 Dispatch/Operations R/M [CSQ]
Other 160.725 Paired with 161.385 I [179.9]

CSX

U.S. Park Police

Channel Frequency Description Remarks
1/6 166.725 Tactical/Special Events R/M [127.3]
2/7 166.925 Dispatch/Operations R/M [127.3]
3/8 167.075 Tactical/Administrative R/M [127.3]
4 166.85 Tactical/Special Ops M
5 172.475 National Capital Parks - Central R [156.7]

National Park Service (NPS)

Frequency Description Remarks
168.3 National Capital Parks - West (C&O Canal) R [141.3]
166.95 C&O Canal Rangers - Unit-to-Unit M
168.425 National Capital Parks - East R [141.3]
170.05 Antietam National Battlefield (Washington County) R [141.3]
171.725 Catoctin Mountain Park (Frederick County) R [141.3]
166.9 Shenandoah National Park (Virginia) R [127.3]

Montgomery County Dept. of Public Works & Transportation

Channel Frequency Description Remarks
1/3 453.95 Highway Services Division - North
Gaithersburg (East and West) Depot
Damascus Depot
Poolesville Depot
R/M [114.8]
2/4 453.4 Highway Services Division - South
Colesville Depot
Bethesda ("Seven Locks") Depot
Silver Spring Depot
R/M [114.8]
Other 150.995 
159.195
Transportation Management Center (TMC)
Paired with 150.995
R [156.7] 
I

Maryland State Highway Administration (SHA)

Channel Frequency Description Remarks
1 47.32 Statewide S [94.8]
2 47.26 District 4 (Baltimore, Harford) S* [94.8]
3 47.4 District 1 (Dorchester, Somerset, Wicomico, Worcester) S [94.8]
4 47.14 District 2 (Caroline, Cecil, Kent, Queen Anne's, Talbot) S* [94.8]
5 47.2 District 3 (Montgomery, Prince George's) S [94.8]
Unknown 47.02 District 5 (Anne Arundel, Calvert, Charles, St. Mary's) S* [94.8]
47.1 District 6 (Allegany, Garrett, Washington) S* [94.8]
47.12 District 7 (Carroll, Frederick, Howard) S [94.8]

Montgomery County RideOn Buses
 
Frequency Description Remarks
452.775 Gaithersburg Area (North) R [203.5]
452.825 Silver Spring Area (South) R [156.7]
452.85 GPS Bus Tracking Data

Montgomery County Airpark (GAI)
 
Frequency Description Remarks
128.7 Approach/Departure (BWI Class B Airspace 181°-019°) S
121.6 Clearance Delivery (thru BWI) S
122.7 Unicom S
128.275 Automated Weather Observing System (AWOS) S
122.85 Multicom (Aviation Support/Runway Lighting Activation) S

Civil Air Patrol (CAP)

Washington Local Media
 
Frequency Organization Description Remarks
455.55
455.1125
WJLA-TV (ABC 7) [Chopper 7] Ch. 1, News Desk/Engineering
Ch. 2, Alternate
S [100.0]
S [100.0]
153.05
455.15
WRC-TV (NBC 4) News Desk
IFB
S [d 331]
S [None]
161.73
161.76
WTTG-TV (Fox 5) [SkyFox Helicopter] Ch. 1, News Desk
Ch. 2, Alternate
S [CSQ]
S*
450.75
450.2125
WUSA-TV (CBS 9) Ch. 1, Engineering
Ch. 2, News Desk
S [141.3]
S [141.3]
455.9125
450.2375
Metro Traffic Ch. 1, Operations
Ch. 2, Alternate
R [141.3]
S [d 743]
452.65 SmarTraveler Traffic R [131.8]
161.7
450.65
WMAL 630 AM Traffic Reports S [CSQ]
S [CSQ]
450.2625 WMZQ 98.7 FM Traffic Reports S
161.64 WPGC 95.5 FM Remotes S [None]
452.975
452.975
Citywide Radio ["Firebuffs"] Ch. 1A, Operations
Ch. 6Z, Alternate
R [103.5]
R [167.9]

Baltimore Local Media
 
Frequency Organization Description Remarks
450.0375
450.1625
450.1375
WBAL-TV (NBC 11) [Chopper 11] Ch. 1/2, News Desk
Ch. 3/4, Engineering
IFB
R/M [131.8]
R/M [131.8]
S [131.8]
450.5375
450.5625
WBFF-TV (Fox 45) News Desk/Engineering
IFB
R [123.0]
S [123.0]
450.3875
450.4375
450.3375
WJZ-TV (CBS 13) [Chopper 13] News Desk
Engineering
IFB
R [141.3]
R [141.3]
S [141.3]
450.3125 WMAR-TV (ABC 2) News Desk/Engineering R [131.8]
450.4875 Metro Traffic Operations R [141.3]
455.6
455.6125
450.3625
Hearst Radio (WBAL 1090 AM, WIYY 97.9 FM) Traffic Reports
Traffic Reports
Operations
S [None]
S [CSQ]
S [82.5]
450.85 WQSR 105.7 FM Traffic Reports S [141.3]
450.0875 WWMX 106.5 FM Traffic Reports S [67.0]
455.95 ? Traffic Reports S [141.3]
 

National Media (Washington)
 
Frequency Organization Description Remarks
455.0875
455.5875
ABC Ch. 1, News Desk
Ch. 2, Engineering
S [136.5]
S
450.4875
450.5125
450.6125
CBS News Desk
Engineering
IFB
R [107.2]
R [107.2]
S [CSQ]
450.8875 CNN News Desk R [127.3]
161.67 NBC News Desk S [d 331]

Lakeforest Mall (Gaithersburg)
 
Frequency Description Remarks
464.5
464.55
Hecht's Loss Prevention M [d 612]
M [d 612]
466.2625
466.9625
JC Penney Loss Prevention M*
M [85.4]
467.1375 Lord and Taylor Loss Prevention M [d 026]
464.7
467.7625
Mall - Security/Maintenance
Mall - Maintenance
R [d 423]
M [d 664]
467.85 FYE (formerly RecordTown) M [167.9]
151.895 Sears Loss Prevention M [77.0]
464.55 Unknown M [67.0]

Washingtonian Center (Gaithersburg)
 
Frequency Description Remarks
467.7625 Galyan's M*
467.8125 Loews Cineplex Rio 18 M [67.0]
464.975
463.6375
Marriott Washingtonian Hotel R [d 343]
M*
464.55 Rio Sport and Health Club M [67.0]
151.625
151.955
151.895
Target - Operations
Target - Stock Room
Target - Loss Prevention
M [179.9]
M [179.9]
M [d 506]
467.9 Unknown - Loss Prevention (Galyan's?) M

Milestone Center (Germantown)
 
Frequency Description Remarks
151.625 Target M [179.9]
154.6 Unknown M
464.55 Unknown M [67.0]
154.57 Walmart M

Montgomery Mall (Bethesda)

Frequency Description Remarks
467.8125 Express M [67.0]
154.6 FinishLine M
154.515 Gap M [74.4]
464.5 Hecht's Loss Prevention M [d 612]
463.7625 Mall Security (has phone patch) R [203.5]
463.8375 Nordstrom Loss Prevention R [173.8]
151.955 Old Navy M [74.4]
151.895 Sears M
154.6 Unknown (not FinishLine; Banana Republic?) M [d 624]
467.9 Unknown M
154.57 Unknown (Champs Sports?) M
467.8125 Unknown (Mall Operations?) M [d 754]

White Flint Mall (Kensington)
 
Frequency Description Remarks
469.1125
469.5
Dave and Buster's M [d 413]
M [d 506]
464.825 Mall Security/Maintenance R [151.4]
464.55 Unknown - restaurant (Cheesecake Factory?) M [67.0]

Local Businesses
 
Frequency Description Remarks
461.525
463.875
Asbury Methodist Village (Gaithersburg) - Maintenance
Asbury Methodist Village (Gaithersburg) - Security/Transportation
R [d 152]
R [d 152]
151.835 B&B Air Conditioning S [88.5]
464.875 GE Information Services (Gaithersburg) R [d 712]
467.85 Kentlands Stadium 8 (Gaithersburg) M [67.0]
467.85 King Farm Visitors Center (Rockville) M [67.0]
496.0375 Leisure World Security R [179.9]
463.225 Magnum Group ["Amguard"] (Gaithersburg) R/M [192.8]
463.45 Montgomery General Hospital (Olney) R [203.5]
452.725 Norbeck Country Club R [d 723]
151.955 Old Navy (Montrose Crossing) M [74.4]
154.57 Olney 9 Cinemas M
463.775 Pavilion Apartments (Rockville) R [173.8]
451.775 Proactive Special Security Services (Montgomery Village Security Patrol) R [146.2]
464.55 Regal Cinemas 13 (Rockville) M [67.0]
154.57 Sam's Club (Gaithersburg) M [67.0]
464.475 Shady Grove Adventist Hospital (Rockville) R [85.4]
154.6 Toys R Us (Gaithersburg) M [94.8]

Nextel Trunked Radio System

Montgomery County Agricultural Center (Gaithersburg)

Frequency Description Remarks
461.1125
462.0125
463.5375
464.3875
MCAC - Admin
MCAC - Ch. 2 - ticket sellers?
MCAC - Security
MCAC - food? cleaning?
M [d 174]
M [d 271]
M [d 743]
M [d 624]
462.6875 Parking M [67.0]
151.625
154.57
154.6
Unknown M
M
M [107.2]
467.8125 food? M
Frequency Description Remarks
154.57
154.57
154.6
Parking M [d 073]
M [d 431]
M [d 654]
151.625 Carnival Ride Ops M [100.0]
462.6625 Tractor Pull Measurements M [67.0]

Montgomery College

Frequency Description Remarks
452.25 Rockville Campus Security R [d 606]
452.25 Takoma Park Campus Security R*
452.0
453.0
Germantown Campus R*
R*

Channel Frequency Description Remarks
1 154.54 Security Dispatch and Operations S
2 151.745 Security Unit-to-Unit/Surveillance & Grounds/Maintenance S
3 151.805 Security Tactical S*

Potomac Electric Power Company (PEPCO)

Channel Frequency Description Remarks
1 451.025 Montgomery County Operations R [192.8]
2 451.05 DC Operations R [192.8]
3 451.075 Prince George's County Operations R [192.8]
4 451.15 Security R [192.8]
5 451.125 Meter Reading R [192.8]
6 451.25 Unit-to-Unit M [192.8]

Washington Suburban Sanitary Commission (WSSC)

Washington Gas

U.S. Capitol Police

Channel Frequency Description Remarks
1/6 169.225 Dispatch/Operations (Primary)
Mon-Fri, Day (until 11pm): Inside/Building Operations
R/M [156.7]
2/7 165.5375 Tactical
Mon-Fri, Day (until 11pm): Outside/Street Operations
R/M [118.8]
3/8 170.175 Tactical R/M [107.2]
4/9 162.25 Command/Tactical
Chamber Gallery Operations
R/M [146.2]
5/10 162.6125 Personal Protection/Special Operations R/M [127.3]

Drug Enforcement Agency (DEA)
 
Channel Frequency Description Remarks
1 418.625 Operations R [156.7]
2 418.9 Operations R*
3 418.75 Strike Force/Surveillance S [156.7]
4 418.675 Strike Force/Surveillance S [156.7]
5 418.825 Operations/Surveillance R*
6 418.95 Operations/Surveillance R [156.7]
7/8 418.975 Operations/Surveillance R/M [156.7]

U.S. Customs Service

U.S. Postal Service

National Institutes of Health (NIH)

National Institute of Standards and Technology (NIST)

National Naval Medical Center (NNMC)

Walter Reed Army Medical Center (WRAMC)

Department of State (DOS)

U.S. Marshals Service

CIA Security Protective Service

U.S. Secret Service

White House Communications Agency (WHCA)

National Weather Service

Oriole Park at Camden Yards (Baltimore, Maryland)

Houston, Texas


ericccarlson [at] hotmail [dot] com
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