Art centers are great places to begin. They are often able to point you the way and are almost also happy to be of service. It is, of course, also a great way to enter the area’s arts community.
Artist and Artisan Associations
Artist and artisan associations are groups designed to give their members that sense of community and to help each other in their creative endeavors. Potters and studio ceramicists may belong to either type of organization.
Heritage centers are also great places to ask about the local potting community. Pottery and basketry are the two oldest crafts that are still practiced today, and as such potters are often involved in bringing the past to life at these centers.
Websites can be found by searching "pottery" and "potter" in your favorite search engine. If you have an area you are especially interested in, such as stoneware, use that term to search or add it to your search string.
Forums can be found by searching "forum + pottery" and "'message board' + pottery". Once you have found a forum that looks interesting, use good etiquette. Most forums have rules you must follow; be sure to read these through. Also, it is good to hang out at a forum for awhile before beginning to post. This gives you a chance to gauge how this group prefers to interact.
One forum community that is ready to welcome you is the Pottery Forum right here. Please sign up and join us!
Blogs are another fun way to meet other potters. I would suggest subscribing to several pottery blogs. You can start by signing up for Beth's Pottery Blog, brought to you by yours truly. To find more blogs, simply search "blog + pottery" in your favorite search engine.