Adjacent Frequency Coordination Councils
The Mid-Atlantic Repeater Council
District of Columbia, Delaware, Maryland, Northern Virginia and the eastern panhandle of West Virginia
Western Pennsylvania Repeater Council
All counties to the west of ARCC service territory in Pennsylvania (ARRL WPA section)
Upper New York Repeater Council
See web site for service territory
Metropolitan Coordination Association, Inc.
New York City, Long Island, Westchester County, and counties in northern New Jersey east of ARCC service territory
Repeater Operator Resources
A vast repository of technical information related to repeaters.
The companion mailing list hosted on groups.io
A world-wide radio-over-IP (RoIIP) network of repeaters, remote base stations, and hotspots.
Internet-based interconnection of amateur stations including some repeaters
Internet Radio Linking Project
General Amateur Radio Information
American Radio Relay League (ARRL)
A national amateur radio organization.
Federal Communications Commission (FCC)
Amateur radio license search via the Universal Licensing System (ULS)
World-wide amateur callsign search and other information