Thank you for wanting to help the cats in your Nana's back yard!
Here's how to search:
Alley Cat Allies and Best Friends are the two national feral cat advocacy groups.
To contact Alley Cat Allies to find out if they know of TNR programs in your area, go here: http://www.alleycat.org/NetCommunity/Page.aspx?pid=444
To contact Best Friends No More Homeless Pets Campaign to see if there are any in their network in your area that can help, the e-mail to contact them is here: http://www.bestfriends.org/nomorehom...ts/thenetwork/
You can also search through http://www.pets911.com/local-shelters-and-rescues
There are two helpful links you can search by zip code here: both the Feral Services and the Find Local Shelters and Rescue. If there are no Feral Services, then contact the shelters and rescues in the area. Sometimes there aren't groups, but rescues will know of individuals that may be willing to help - or of organizations that aren't listed in the search.
You can also search through http://www.petfinder.com
. Just search for "cat" in your zip code. All the listings have an affiliated organization, and all the organizations have either a link to a contact page or a website, all which will have contact info somewhere. Call, send e-mails, and generally just ask! Plead!
The other thing you can do is call around to local vets to see if they know of or work with anyone working with ferals. They make think you're crazy - and you may feel crazy - until you find that one that says "Oh yeah, we have a 'crazy cat person.' Why don't you give me your number, and we'll call him/her to see if he/she can help." Well - in our case, that would be crazy cat couple.
If you start an e-mail campaign to locate help, don't expect responses right away. Most orgs are under-staffed and under-funded.
In fact, so many places don't have TNR groups, that most of us ended up figuring out how to procure traps, learning how to trap, and locating a vet or clinic to work with.