The Collaborative International Dictionary of English v.0.48:

Dixie \Dix"ie\ (d[i^]ks"[y^]), prop. n.
   1. A colloquial name for the Southern portion of the United
      States, esp. during the Civil War. [U.S.]

   Syn: Dixieland, Dixie Land, the Confederacy, Confederate
        States of America, the South.

   Syn: . [1913 Webster]

   2. a song popular in the Confederate states during the
      American Civil War, and still played as a nostalgic anthem
      by those patriotic to the American south. It was written
      by Daniel D. Emmett in 1859.
      [PJC]

   whistle Dixie to talk unrealistically; to engage in
      unrealistic or overoptimistic fantasies; as, that ain't
      just whistlin' Dixie.
      [PJC]

U.S. Gazetteer (1990):

Dixie, GA
  Zip code(s): 31629
Dixie, ID
  Zip code(s): 83525
Dixie, KY
  Zip code(s): 41017
Dixie, LA
  Zip code(s): 71107
Dixie, WV
  Zip code(s): 25059

Moby Thesaurus II by Grady Ward, 1.0:

24 Moby Thesaurus words for "Dixie":
   Dixieland, Down East, East, East Coast, Middle Atlantic,
   Middle West, New England, North, North Central region, Northeast,
   Northwest, Pacific Northwest, South, Southeast, Southwest, Sunbelt,
   West, West Coast, Yankeeland, eastland, northland, the Coast,
   westland, wild West