The most important aspect of cat control is spay/neuter. If you can get local government to help subsidize it the Humane Society or ASPCA has mobile clinics that will move into the community for a limited time and sterilize animals. One of these units came to a neighboring county last year. They trapped animals, inoculated them, neutered them and then returned them.
They trapped animals, inoculated them, neutered them and then returned them.
One shoreside community near Charleston, SC with a feral cat problem does the same thing ... then notches the ear of the cat. This lets people know which cats have been 'treated'.