The Collaborative International Dictionary of English v.0.48:

Sedan \Se*dan"\, n. [Said to be named from Sedan, in France,
   where it was first made, and whence it was introduced into
   England in the time of King Charles I.]
   A portable chair or covered vehicle for carrying a single
   person, -- usually borne on poles by two men. Called also
   sedan chair.
   [1913 Webster]

U.S. Gazetteer (1990):

Sedan, KS (city, FIPS 63750)
  Location: 37.12737 N, 96.18469 W
  Population (1990): 1306 (704 housing units)
  Area: 2.0 sq km (land), 0.0 sq km (water)
  Zip code(s): 67361
Sedan, MN (city, FIPS 59188)
  Location: 45.57699 N, 95.24550 W
  Population (1990): 63 (28 housing units)
  Area: 1.3 sq km (land), 0.0 sq km (water)
  Zip code(s): 56380
Sedan, NM
  Zip code(s): 88436