The Collaborative International Dictionary of English v.0.48:

Mullen \Mul"len\, n. (Bot.)
   See Mullein.
   [1913 Webster]

U.S. Gazetteer Places (2000):

Mullen, NE -- U.S. village in Nebraska
   Population (2000):    491
   Housing Units (2000): 309
   Land area (2000):     0.375445 sq. miles (0.972398 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.375445 sq. miles (0.972398 sq. km)
   FIPS code:            33250
   Located within:       Nebraska (NE), FIPS 31
   Location:             42.042480 N, 101.045611 W
   ZIP Codes (1990):     69152
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Mullen, NE
    Mullen