The Louisville Metro Council passed an ordinance last year that requires all rental properties to be registered with the city by March 1st of this year. Similar requirements exist in Indianapolis, Austin, Memphis and Pittsburgh.
Registration requires an account with Develop Louisville and owners must provide the rental unit's street address along with current contact information of the owner and managing operator. If property is transferred, new owners must register with 30 days of obtaining ownership.
Here is an easy to follow registration guide and more information about the registry.