The Collaborative International Dictionary of English v.0.48:

Tupman \Tup"man\, n.; pl. Tupmen.
   A man who breeds, or deals in tups. [Prov. Eng.]
   [1913 Webster]

U.S. Gazetteer Places (2000):

Tupman, CA -- U.S. Census Designated Place in California
   Population (2000):    227
   Housing Units (2000): 75
   Land area (2000):     0.532822 sq. miles (1.380002 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.532822 sq. miles (1.380002 sq. km)
   FIPS code:            80784
   Located within:       California (CA), FIPS 06
   Location:             35.298609 N, 119.351396 W
   ZIP Codes (1990):     93276
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Tupman, CA
    Tupman