For sheer sense of place then TC Boyle's 'The Tortilla Curtain' and Daniel Woodrell's 'Winters Bone' are unbeatable. The writing is tight, sparse and they know people.
Betty Smith's 'A Tree Grows in Brooklyn' is warm, filled with love for characters that live, harsh, often brutish lives.
Barbara Kingsolver doesn't put a foot wrong but I particularly love' The Prodigal Summer' for its Appalachian forest setting and the few, finely drawn characters.
Bailey White is one of my favourites- her two short story collections 'Mama Makes Up her Mind' and 'Sleeping at the Starlite Motel' are modern Southern Gothic with alligators, predatory spiders and a mamma who is as mad as a fish. Brilliant.
Michael Lee West's 'Consuming Passions' is a brilliant Louisiana based culinary memoir. Barking Southern relatives, mad dogs, gumbo and crawfish.
Karen Russell's short stories and first novel 'Swamplandia' are set in the South, mainly Florida. They are redolent with swampy, cracker atmosphere.
Janice Owen again, is a Florida 'Cracker' (her own definition) and in 'American Ghosts' she pays tribute to her heritage. Amazing writing.
'Garden of Evening Mists' is written in a way that makes me swoon.