The Collaborative International Dictionary of English v.0.48:

Rochelle \Ro*chelle"\, n.
   A seaport town in France.
   [1913 Webster]

   Rochelle powders. Same as Seidlitz powders.

   Rochelle salt (Chem.), the double tartrate of sodium and
      potassium, a white crystalline substance. It has a
      cooling, saline, slightly bitter taste and is employed as
      a mild purgative. It was discovered by Seignette, an
      apothecary of Rochelle, and is called also Seignete's
      salt.
      [1913 Webster]

U.S. Gazetteer (1990):

Rochelle, GA (city, FIPS 66024)
  Location: 31.94883 N, 83.45721 W
  Population (1990): 1510 (613 housing units)
  Area: 4.9 sq km (land), 0.0 sq km (water)
  Zip code(s): 31079
Rochelle, IL (city, FIPS 64746)
  Location: 41.91843 N, 89.06275 W
  Population (1990): 8769 (3605 housing units)
  Area: 10.8 sq km (land), 0.0 sq km (water)
  Zip code(s): 61068
Rochelle, TX
  Zip code(s): 76872