The Collaborative International Dictionary of English v.0.48:

frankfurter \frank"fur*ter\
   A small cooked sausage of beef or beef and pork, usually 5 to
   6 inches, sometimes as long as 12 inches in length; called
   also frankforter, frankfort, frankfurt. It is commonly
   eaten on a roll, called a hot dog bun.

   Syn: wiener, hot dog[1].
        [PJC]

U.S. Gazetteer (1990):

Frankfort, IL (village, FIPS 27624)
  Location: 41.49699 N, 87.83594 W
  Population (1990): 7180 (2317 housing units)
  Area: 21.6 sq km (land), 0.0 sq km (water)
  Zip code(s): 60423
Frankfort, IN (city, FIPS 25324)
  Location: 40.28110 N, 86.51030 W
  Population (1990): 14754 (6146 housing units)
  Area: 11.8 sq km (land), 0.0 sq km (water)
Frankfort, KS (city, FIPS 24275)
  Location: 39.70381 N, 96.41764 W
  Population (1990): 927 (454 housing units)
  Area: 2.6 sq km (land), 0.0 sq km (water)
Frankfort, KY (city, FIPS 28900)
  Location: 38.19077 N, 84.86520 W
  Population (1990): 25968 (11880 housing units)
  Area: 37.7 sq km (land), 0.7 sq km (water)
Frankfort, ME
  Zip code(s): 04438
Frankfort, MI (city, FIPS 30260)
  Location: 44.63686 N, 86.23398 W
  Population (1990): 1546 (850 housing units)
  Area: 3.6 sq km (land), 0.5 sq km (water)
  Zip code(s): 49635
Frankfort, NY (village, FIPS 27188)
  Location: 43.03809 N, 75.07194 W
  Population (1990): 2693 (1124 housing units)
  Area: 2.6 sq km (land), 0.0 sq km (water)
  Zip code(s): 13340
Frankfort, OH (village, FIPS 28182)
  Location: 39.40800 N, 83.18284 W
  Population (1990): 1065 (435 housing units)
  Area: 1.3 sq km (land), 0.0 sq km (water)
  Zip code(s): 45628
Frankfort, SD (city, FIPS 22580)
  Location: 44.87741 N, 98.30857 W
  Population (1990): 192 (100 housing units)
  Area: 2.0 sq km (land), 0.0 sq km (water)
  Zip code(s): 57440