Areas:
Yellow - 1st class (Louisville Metro)
Orange - 2nd class (Jeffersontown)
Red - 3rd class (Shively)
Magenta - 4th class
Blue - 5th class
Green - 6th class
Cyan - Ohio RiverDotted outlines:

Purple - urban neighborhoods
Black - extent of Louisville before city-county merger
Blue - census designated places
Own work
Lasunncty