This is the URL for the Polk County web site. If you check under the Cemeteries section, you'll find not only St. Luke's in McIntosh, but several other cemeteries have been noted, too.
[For more complete help, you should probably join the Polk County Mailing List rather than the message board. The message board sends an automated robotic email to the Polk County Mailing List, but answering is almost impossible unless one registers and answers on a message board (passwords and such are a hassle). It's much easier to hit Reply and answer than it is to take the trouble to get to the message board to answer anyone.]