From The RadioReference Wiki
Official Feeds are live audio feeds broadcast and sponsored directly by the agency or organization being broadcast.
Feeds can only be designed at official if the agency broadcasting the feed sends a letter to RadioReference.com, on official letterhead, requesting that the feed be identified as officially broadcast by the organization.
The letter needs to contain the name and location of the feed broadcast, as well as a statement indicating that the organization wishes to have the feed marked as an provided by an official agency.
The letter should be sent to:
RadioReference.com LLC ATTN: Lindsay Blanton 18160 US Hwy 281N Suite 108-133 San Antonio, TX 78232
Official broadcast feeds are identified with the following red star under the feed genre column.