The Collaborative International Dictionary of English v.0.48:

Cass \Cass\ (k[a^]s), v. t. [F. casser, LL. cassare, fr. L.
   cassus empty, hollow, and perhaps influenced by L. quassare
   to shake, shatter, v. intens. of quatere to shake. Cf.
   Cashier, v. t., Quash, Cask.]
   To render useless or void; to quash; to annul; to reject; to
   send away. [Obs.] --Sir W. Raleigh.
   [1913 Webster]

U.S. Gazetteer Counties (2000):

Cass -- U.S. County in Iowa
   Population (2000):    14684
   Housing Units (2000): 6590
   Land area (2000):     564.328727 sq. miles (1461.604630 sq. km)
   Water area (2000):    0.679775 sq. miles (1.760610 sq. km)
   Total area (2000):    565.008502 sq. miles (1463.365240 sq. km)
   Located within:       Iowa (IA), FIPS 19
   Location:             41.358575 N, 94.965991 W
   Headwords:
    Cass
    Cass, IA
    Cass County
    Cass County, IA


U.S. Gazetteer Counties (2000):

Cass -- U.S. County in Illinois
   Population (2000):    13695
   Housing Units (2000): 5784
   Land area (2000):     375.900754 sq. miles (973.578443 sq. km)
   Water area (2000):    7.830552 sq. miles (20.281035 sq. km)
   Total area (2000):    383.731306 sq. miles (993.859478 sq. km)
   Located within:       Illinois (IL), FIPS 17
   Location:             39.975926 N, 90.269918 W
   Headwords:
    Cass
    Cass, IL
    Cass County
    Cass County, IL


U.S. Gazetteer Counties (2000):

Cass -- U.S. County in Indiana
   Population (2000):    40930
   Housing Units (2000): 16620
   Land area (2000):     412.868168 sq. miles (1069.323600 sq. km)
   Water area (2000):    2.055343 sq. miles (5.323314 sq. km)
   Total area (2000):    414.923511 sq. miles (1074.646914 sq. km)
   Located within:       Indiana (IN), FIPS 18
   Location:             40.746875 N, 86.345234 W
   Headwords:
    Cass
    Cass, IN
    Cass County
    Cass County, IN


U.S. Gazetteer Counties (2000):

Cass -- U.S. County in Michigan
   Population (2000):    51104
   Housing Units (2000): 23884
   Land area (2000):     492.178715 sq. miles (1274.736966 sq. km)
   Water area (2000):    16.285911 sq. miles (42.180313 sq. km)
   Total area (2000):    508.464626 sq. miles (1316.917279 sq. km)
   Located within:       Michigan (MI), FIPS 26
   Location:             41.921510 N, 86.022079 W
   Headwords:
    Cass
    Cass, MI
    Cass County
    Cass County, MI


U.S. Gazetteer Counties (2000):

Cass -- U.S. County in Missouri
   Population (2000):    82092
   Housing Units (2000): 31677
   Land area (2000):     698.990544 sq. miles (1810.377121 sq. km)
   Water area (2000):    3.683292 sq. miles (9.539683 sq. km)
   Total area (2000):    702.673836 sq. miles (1819.916804 sq. km)
   Located within:       Missouri (MO), FIPS 29
   Location:             38.689373 N, 94.376663 W
   Headwords:
    Cass
    Cass, MO
    Cass County
    Cass County, MO


U.S. Gazetteer Counties (2000):

Cass -- U.S. County in Minnesota
   Population (2000):    27150
   Housing Units (2000): 21286
   Land area (2000):     2017.596075 sq. miles (5225.549622 sq. km)
   Water area (2000):    396.613764 sq. miles (1027.224890 sq. km)
   Total area (2000):    2414.209839 sq. miles (6252.774512 sq. km)
   Located within:       Minnesota (MN), FIPS 27
   Location:             46.897206 N, 94.373472 W
   Headwords:
    Cass
    Cass, MN
    Cass County
    Cass County, MN


U.S. Gazetteer Counties (2000):

Cass -- U.S. County in Nebraska
   Population (2000):    24334
   Housing Units (2000): 10179
   Land area (2000):     559.184020 sq. miles (1448.279901 sq. km)
   Water area (2000):    7.025843 sq. miles (18.196849 sq. km)
   Total area (2000):    566.209863 sq. miles (1466.476750 sq. km)
   Located within:       Nebraska (NE), FIPS 31
   Location:             40.936518 N, 96.093393 W
   Headwords:
    Cass
    Cass, NE
    Cass County
    Cass County, NE


U.S. Gazetteer Counties (2000):

Cass -- U.S. County in North Dakota
   Population (2000):    123138
   Housing Units (2000): 53790
   Land area (2000):     1765.228881 sq. miles (4571.921620 sq. km)
   Water area (2000):    2.678294 sq. miles (6.936749 sq. km)
   Total area (2000):    1767.907175 sq. miles (4578.858369 sq. km)
   Located within:       North Dakota (ND), FIPS 38
   Location:             46.899583 N, 97.084444 W
   Headwords:
    Cass
    Cass, ND
    Cass County
    Cass County, ND


U.S. Gazetteer Counties (2000):

Cass -- U.S. County in Texas
   Population (2000):    30438
   Housing Units (2000): 13890
   Land area (2000):     937.352814 sq. miles (2427.732541 sq. km)
   Water area (2000):    22.992951 sq. miles (59.551467 sq. km)
   Total area (2000):    960.345765 sq. miles (2487.284008 sq. km)
   Located within:       Texas (TX), FIPS 48
   Location:             33.077180 N, 94.323065 W
   Headwords:
    Cass
    Cass, TX
    Cass County
    Cass County, TX