The Collaborative International Dictionary of English v.0.48:

Natchez \Natch"ez\, n. pl. (Ethnol.)
   A tribe of Indians who formerly lived near the site of the
   city of Natchez, Mississippi. In 1729 they were subdued by
   the French; the survivors joined the Creek Confederacy.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Natchez
    n 1: a town in southwest Mississippi on the Mississippi River

U.S. Gazetteer Places (2000):

Natchez, LA -- U.S. village in Louisiana
   Population (2000):    583
   Housing Units (2000): 264
   Land area (2000):     1.073778 sq. miles (2.781073 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.073778 sq. miles (2.781073 sq. km)
   FIPS code:            53510
   Located within:       Louisiana (LA), FIPS 22
   Location:             31.674145 N, 93.044740 W
   ZIP Codes (1990):     71456
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Natchez, LA
    Natchez


U.S. Gazetteer Places (2000):

Natchez, MS -- U.S. city in Mississippi
   Population (2000):    18464
   Housing Units (2000): 8479
   Land area (2000):     13.204609 sq. miles (34.199778 sq. km)
   Water area (2000):    0.644693 sq. miles (1.669748 sq. km)
   Total area (2000):    13.849302 sq. miles (35.869526 sq. km)
   FIPS code:            50440
   Located within:       Mississippi (MS), FIPS 28
   Location:             31.554393 N, 91.387566 W
   ZIP Codes (1990):     39120
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Natchez, MS
    Natchez