The Collaborative International Dictionary of English v.0.48:

Modocs \Mo"docs\, n. pl.; sing. Modoc. (Ethnol.)
   A tribe of warlike Indians formerly inhabiting Northern
   California. They are nearly extinct.
   [1913 Webster]

U.S. Gazetteer Counties (2000):

Modoc -- U.S. County in California
   Population (2000):    9449
   Housing Units (2000): 4807
   Land area (2000):     3944.096888 sq. miles (10215.163611 sq. km)
   Water area (2000):    259.277148 sq. miles (671.524702 sq. km)
   Total area (2000):    4203.374036 sq. miles (10886.688313 sq. km)
   Located within:       California (CA), FIPS 06
   Location:             41.527360 N, 120.790625 W
   Headwords:
    Modoc
    Modoc, CA
    Modoc County
    Modoc County, CA


U.S. Gazetteer Places (2000):

Modoc, IN -- U.S. town in Indiana
   Population (2000):    225
   Housing Units (2000): 90
   Land area (2000):     0.117920 sq. miles (0.305412 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.117920 sq. miles (0.305412 sq. km)
   FIPS code:            50058
   Located within:       Indiana (IN), FIPS 18
   Location:             40.046323 N, 85.126125 W
   ZIP Codes (1990):     47358
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Modoc, IN
    Modoc


U.S. Gazetteer Places (2000):

Modoc, SC -- U.S. Census Designated Place in South Carolina
   Population (2000):    256
   Housing Units (2000): 259
   Land area (2000):     4.080875 sq. miles (10.569417 sq. km)
   Water area (2000):    3.078217 sq. miles (7.972546 sq. km)
   Total area (2000):    7.159092 sq. miles (18.541963 sq. km)
   FIPS code:            47050
   Located within:       South Carolina (SC), FIPS 45
   Location:             33.714739 N, 82.218318 W
   ZIP Codes (1990):     29838
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Modoc, SC
    Modoc