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- US Fish and Wildlife Service - Litchfield Wetland Management District (MN)
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- US Forest Service - Land Between The Lakes (KY/TN)
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- US Forest Service - Nebraska National Forests and Grasslands (NE)
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- US Forest Service - Payette National Forest (ID)
- US Forest Service - Pike National Forest (CO)
- US Forest Service - Plumas National Forest (CA)
- US Forest Service - Prescott National Forest (AZ)
- US Forest Service - Rio Grande National Forest (CO)
- US Forest Service - Roosevelt National Forest (CO)
- US Forest Service - Salmon-Challis National Forest (ID)
- US Forest Service - San Bernardino National Forest (CA)
- US Forest Service - San Isabel National Forest (CO)
- US Forest Service - San Juan National Forest (CO)
- US Forest Service - Santa Fe National Forest (NM)
- US Forest Service - Sawtooth National Forest (ID)
- US Forest Service - Sequoia National Forest (CA)
- US Forest Service - Shasta-Trinity National Forests (CA)
- US Forest Service - Shoshone National Forest (WY)
- US Forest Service - Sierra National Forest (CA)
- US Forest Service - Six Rivers National Forest (CA)
- US Forest Service - Stanislaus National Forest (CA)
- US Forest Service - Superior National Forest (MN)
- US Forest Service - Tahoe National Forest (CA)
- US Forest Service - Talladega National Forest (AL)
- US Forest Service - Tonto National Forest (AZ)
- US Forest Service - Tuskegee National Forest (AL)
- US Forest Service - Uinta-Wasatch-Cache National Forest (UT)
- US Forest Service - Umpqua National Forest (OR)
- US Forest Service - Wayne National Forest (OH)
- US Forest Service - White Mountain National Forest (NH/ME)
- US Forest Service - White River National Forest (CO)
- US Forest Service - William B Bankhead National Forest (AL)
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- US and Canada National DSDPlus Network List
- Uintah County (UT)
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- Ulster County (NY) Fire Tone Outs
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- Ultra high frequency
- Umatilla Army Chemical Depot
- Umatilla County (OR)
- Undecodeable NATO Digital Signals
- UniTrunker
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- Unication Voice Pager Receivers
- Unicoi County (TN)
- Unid Federal - BC10 - Poss Yuma Proving Grounds
- Unid Talkgroups Montgomery County (OH)
- Uniden
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- Uniden Scanner Test Modes for the original DMA scanners
- Uniden Scanner eBay Listings
- Uniden Scanners
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- Uniden scanners
- Unidentfied KU/LG&E Talkgroups
- Unidentified Federal (Austin)
- Unidentified Federal Motorola 5627
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- Unidentified Federal TN
- Unidentified Frequencies
- Unidentified LTR (George Town 1)
- Unidentified Motorola 193F
- Unidentified Motorola 2B34
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- Unidentified Motorola 3B36 Unknown Talkgroups
- Unidentified Motorola 5F26
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- Unidentified Trunked Systems (MN)
- Union County (FL)
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- United Airlines - Chicago O'Hare International Unknown Talkgroups
- United Airlines - Denver International Unknown Talkgroups
- United Airlines - Dulles International Unknown Talkgroups
- United Airlines - Newark Liberty International Unknown Talkgroups
- United Counties of Prescott and Russell (ON)
- United Counties of Stormont, Dundas and Glengarry (ON)
- United States Air Force
- United States Air Force (157)
- United States Air Force (157) Unknown Talkgroups by Site
- United States Air Force (3D6)
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- United States Air Force (BC31)
- United States Air Force (BC31) Unknown Talkgroups
- United States Army (58A)
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- United States Army (98D)
- United States Army (98D) Unknown Talkgroups
- United States Coast Guard
- United States Department of Defense
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- United States Department of Defense (1B5C8-001)
- United States Department of Defense (BEE00-14C) Unknown Talkgroups
- United States Forest Service (CA)
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- United States Patent and Trademark Office
- United States Patent and Trademark Office Site Research
- United States Secret Service
- United States Steel Corporation (LTR)
- Universities/Colleges in Buffalo
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- University Health Network - Toronto General Hospital
- University Health Network - Toronto General Hospital Radio IDs
- University Of Hartford
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- University of Akron Site Research
- University of Central Florida (Capacity Plus)
- University of Central Florida Unknown Talkgroups
- University of Illinois
- University of Illinois at Urbana-Champaign
- University of Kansas / Lawrence / Douglas County