The Collaborative International Dictionary of English v.0.48:

Ottawas \Ot"ta*was\, n. pl.; sing. Ottawa. (Ethnol.)
   A tribe of Indians who, when first known, lived on the Ottawa
   River. Most of them subsequently migrated to the southwestern
   shore of Lake Superior.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Ottawa
    n 1: a member of the Algonquian people of southern Ontario
    2: a river in southeastern Canada that flows along the boundary
       between Quebec and Ontario to the Saint Lawrence River near
       Montreal [syn: Outaouais, Ottawa, Ottawa river]
    3: the capital of Canada (located in southeastern Ontario across
       the Ottawa river from Quebec) [syn: Ottawa, Canadian
       capital, capital of Canada]

U.S. Gazetteer Counties (2000):

Ottawa -- U.S. County in Kansas
   Population (2000):    6163
   Housing Units (2000): 2755
   Land area (2000):     721.111102 sq. miles (1867.669100 sq. km)
   Water area (2000):    0.785567 sq. miles (2.034610 sq. km)
   Total area (2000):    721.896669 sq. miles (1869.703710 sq. km)
   Located within:       Kansas (KS), FIPS 20
   Location:             39.127258 N, 97.674561 W
   Headwords:
    Ottawa
    Ottawa, KS
    Ottawa County
    Ottawa County, KS


U.S. Gazetteer Counties (2000):

Ottawa -- U.S. County in Michigan
   Population (2000):    238314
   Housing Units (2000): 86856
   Land area (2000):     565.653939 sq. miles (1465.036914 sq. km)
   Water area (2000):    1066.315188 sq. miles (2761.743542 sq. km)
   Total area (2000):    1631.969127 sq. miles (4226.780456 sq. km)
   Located within:       Michigan (MI), FIPS 26
   Location:             42.929975 N, 86.049749 W
   Headwords:
    Ottawa
    Ottawa, MI
    Ottawa County
    Ottawa County, MI


U.S. Gazetteer Counties (2000):

Ottawa -- U.S. County in Ohio
   Population (2000):    40985
   Housing Units (2000): 25532
   Land area (2000):     254.953085 sq. miles (660.325431 sq. km)
   Water area (2000):    330.167727 sq. miles (855.130451 sq. km)
   Total area (2000):    585.120812 sq. miles (1515.455882 sq. km)
   Located within:       Ohio (OH), FIPS 39
   Location:             41.542200 N, 83.040528 W
   Headwords:
    Ottawa
    Ottawa, OH
    Ottawa County
    Ottawa County, OH


U.S. Gazetteer Counties (2000):

Ottawa -- U.S. County in Oklahoma
   Population (2000):    33194
   Housing Units (2000): 14842
   Land area (2000):     471.324071 sq. miles (1220.723689 sq. km)
   Water area (2000):    13.410846 sq. miles (34.733931 sq. km)
   Total area (2000):    484.734917 sq. miles (1255.457620 sq. km)
   Located within:       Oklahoma (OK), FIPS 40
   Location:             36.861373 N, 94.839825 W
   Headwords:
    Ottawa
    Ottawa, OK
    Ottawa County
    Ottawa County, OK


U.S. Gazetteer Places (2000):

Ottawa, OH -- U.S. village in Ohio
   Population (2000):    4367
   Housing Units (2000): 1849
   Land area (2000):     3.876177 sq. miles (10.039251 sq. km)
   Water area (2000):    0.027660 sq. miles (0.071639 sq. km)
   Total area (2000):    3.903837 sq. miles (10.110890 sq. km)
   FIPS code:            58982
   Located within:       Ohio (OH), FIPS 39
   Location:             41.020885 N, 84.041314 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Ottawa, OH
    Ottawa


U.S. Gazetteer Places (2000):

Ottawa, IL -- U.S. city in Illinois
   Population (2000):    18307
   Housing Units (2000): 8030
   Land area (2000):     7.329036 sq. miles (18.982114 sq. km)
   Water area (2000):    0.333547 sq. miles (0.863884 sq. km)
   Total area (2000):    7.662583 sq. miles (19.845998 sq. km)
   FIPS code:            56926
   Located within:       Illinois (IL), FIPS 17
   Location:             41.347118 N, 88.842184 W
   ZIP Codes (1990):     61350
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Ottawa, IL
    Ottawa


U.S. Gazetteer Places (2000):

Ottawa, KS -- U.S. city in Kansas
   Population (2000):    11921
   Housing Units (2000): 5080
   Land area (2000):     6.693401 sq. miles (17.335827 sq. km)
   Water area (2000):    0.006144 sq. miles (0.015913 sq. km)
   Total area (2000):    6.699545 sq. miles (17.351740 sq. km)
   FIPS code:            53550
   Located within:       Kansas (KS), FIPS 20
   Location:             38.612044 N, 95.266513 W
   ZIP Codes (1990):     66067
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Ottawa, KS
    Ottawa