The Collaborative International Dictionary of English v.0.48:

Peorias \Pe*o"ri*as\, n. pl.; sing. Peoria. (Ethnol.)
   An Algonquin tribe of Indians who formerly inhabited a part
   of Illinois.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Peoria
    n 1: a city in central Illinois on the Illinois River

U.S. Gazetteer Counties (2000):

Peoria -- U.S. County in Illinois
   Population (2000):    183433
   Housing Units (2000): 78204
   Land area (2000):     619.522444 sq. miles (1604.555696 sq. km)
   Water area (2000):    11.363226 sq. miles (29.430618 sq. km)
   Total area (2000):    630.885670 sq. miles (1633.986314 sq. km)
   Located within:       Illinois (IL), FIPS 17
   Location:             40.752492 N, 89.665063 W
   Headwords:
    Peoria
    Peoria, IL
    Peoria County
    Peoria County, IL


U.S. Gazetteer Places (2000):

Peoria, AZ -- U.S. city in Arizona
   Population (2000):    108364
   Housing Units (2000): 42573
   Land area (2000):     138.217232 sq. miles (357.980973 sq. km)
   Water area (2000):    3.462036 sq. miles (8.966631 sq. km)
   Total area (2000):    141.679268 sq. miles (366.947604 sq. km)
   FIPS code:            54050
   Located within:       Arizona (AZ), FIPS 04
   Location:             33.649738 N, 112.251584 W
   ZIP Codes (1990):     85345 85381 85382
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Peoria, AZ
    Peoria


U.S. Gazetteer Places (2000):

Peoria, OK -- U.S. town in Oklahoma
   Population (2000):    141
   Housing Units (2000): 59
   Land area (2000):     0.242285 sq. miles (0.627515 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.242285 sq. miles (0.627515 sq. km)
   FIPS code:            58100
   Located within:       Oklahoma (OK), FIPS 40
   Location:             36.915128 N, 94.670256 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Peoria, OK
    Peoria


U.S. Gazetteer Places (2000):

Peoria, IL -- U.S. city in Illinois
   Population (2000):    112936
   Housing Units (2000): 49125
   Land area (2000):     44.403632 sq. miles (115.004873 sq. km)
   Water area (2000):    2.229584 sq. miles (5.774597 sq. km)
   Total area (2000):    46.633216 sq. miles (120.779470 sq. km)
   FIPS code:            59000
   Located within:       Illinois (IL), FIPS 17
   Location:             40.720737 N, 89.609421 W
   ZIP Codes (1990):     61602 61604 61605 61606 61615
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Peoria, IL
    Peoria