WordNet (r) 3.0 (2006):

Mason City
    n 1: a town in north central Iowa

U.S. Gazetteer Places (2000):

Mason City, NE -- U.S. village in Nebraska
   Population (2000):    178
   Housing Units (2000): 91
   Land area (2000):     0.471716 sq. miles (1.221740 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.471716 sq. miles (1.221740 sq. km)
   FIPS code:            31115
   Located within:       Nebraska (NE), FIPS 31
   Location:             41.222485 N, 99.298352 W
   ZIP Codes (1990):     68855
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Mason City, NE
    Mason City


U.S. Gazetteer Places (2000):

Mason City, IL -- U.S. city in Illinois
   Population (2000):    2558
   Housing Units (2000): 1127
   Land area (2000):     0.984197 sq. miles (2.549059 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.984197 sq. miles (2.549059 sq. km)
   FIPS code:            47475
   Located within:       Illinois (IL), FIPS 17
   Location:             40.202965 N, 89.696109 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Mason City, IL
    Mason City


U.S. Gazetteer Places (2000):

Mason City, IA -- U.S. city in Iowa
   Population (2000):    29172
   Housing Units (2000): 13029
   Land area (2000):     25.786408 sq. miles (66.786488 sq. km)
   Water area (2000):    0.376553 sq. miles (0.975269 sq. km)
   Total area (2000):    26.162961 sq. miles (67.761757 sq. km)
   FIPS code:            50160
   Located within:       Iowa (IA), FIPS 19
   Location:             43.148747 N, 93.201916 W
   ZIP Codes (1990):     50401
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Mason City, IA
    Mason City