The Collaborative International Dictionary of English v.0.48:

Troy \Troy\, n.
   Troy weight.
   [1913 Webster]

   Troy weight, the weight which gold and silver, jewels, and
      the like, are weighed. It was so named from Troyes, in
      France, where it was first adopted in Europe. The troy
      ounce is supposed to have been brought from Cairo during
      the crusades. In this weight the pound is divided into 12
      ounces, the ounce into 20 pennyweights, and the
      pennyweight into 24 grains; hence, the troy ounce contains
      480 grains, and the troy pound contains 5760 grains. The
      avoirdupois pound contains 7000 troy grains; so that 175
      pounds troy equal 144 pounds avoirdupois, or 1 pound troy
      = 0.82286 of a pound avoirdupois, and 1 ounce troy =
      117/175 or 1.09714 ounce avoirdupois. Troy weight when
      divided, the pound into 12 ounces, the ounce into 8 drams,
      the dram into 3 scruples, and the scruple into 20 grains,
      is called apothecaries' weight, used in weighing
      medicines, etc. In the standard weights of the United
      States, the troy ounce is divided decimally down to the
      1/10000 part.
      [1913 Webster]

WordNet (r) 3.0 (2006):

troy
    n 1: a system of weights used for precious metals and gemstones;
         based on a 12-ounce pound and an ounce of 480 grains [syn:
         troy, troy weight]
    2: an ancient city in Asia Minor that was the site of the Trojan
       War [syn: Troy, Ilion, Ilium]

U.S. Gazetteer Places (2000):

Troy, AL -- U.S. city in Alabama
   Population (2000):    13935
   Housing Units (2000): 6436
   Land area (2000):     26.238045 sq. miles (67.956221 sq. km)
   Water area (2000):    0.094995 sq. miles (0.246036 sq. km)
   Total area (2000):    26.333040 sq. miles (68.202257 sq. km)
   FIPS code:            76920
   Located within:       Alabama (AL), FIPS 01
   Location:             31.801960 N, 85.967317 W
   ZIP Codes (1990):     36081
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Troy, AL
    Troy


U.S. Gazetteer Places (2000):

Troy, MO -- U.S. city in Missouri
   Population (2000):    6737
   Housing Units (2000): 2661
   Land area (2000):     5.938319 sq. miles (15.380174 sq. km)
   Water area (2000):    0.009803 sq. miles (0.025389 sq. km)
   Total area (2000):    5.948122 sq. miles (15.405563 sq. km)
   FIPS code:            73942
   Located within:       Missouri (MO), FIPS 29
   Location:             38.974922 N, 90.977132 W
   ZIP Codes (1990):     63379
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Troy, MO
    Troy


U.S. Gazetteer Places (2000):

Troy, MT -- U.S. city in Montana
   Population (2000):    957
   Housing Units (2000): 469
   Land area (2000):     0.758193 sq. miles (1.963712 sq. km)
   Water area (2000):    0.017392 sq. miles (0.045045 sq. km)
   Total area (2000):    0.775585 sq. miles (2.008757 sq. km)
   FIPS code:            75025
   Located within:       Montana (MT), FIPS 30
   Location:             48.459944 N, 115.890974 W
   ZIP Codes (1990):     59935
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Troy, MT
    Troy


U.S. Gazetteer Places (2000):

Troy, NY -- U.S. city in New York
   Population (2000):    49170
   Housing Units (2000): 23093
   Land area (2000):     10.413409 sq. miles (26.970604 sq. km)
   Water area (2000):    0.603485 sq. miles (1.563018 sq. km)
   Total area (2000):    11.016894 sq. miles (28.533622 sq. km)
   FIPS code:            75484
   Located within:       New York (NY), FIPS 36
   Location:             42.738278 N, 73.680809 W
   ZIP Codes (1990):     12180 12182
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Troy, NY
    Troy


U.S. Gazetteer Places (2000):

Troy, NC -- U.S. town in North Carolina
   Population (2000):    3430
   Housing Units (2000): 1209
   Land area (2000):     2.965081 sq. miles (7.679524 sq. km)
   Water area (2000):    0.014188 sq. miles (0.036746 sq. km)
   Total area (2000):    2.979269 sq. miles (7.716270 sq. km)
   FIPS code:            68520
   Located within:       North Carolina (NC), FIPS 37
   Location:             35.360420 N, 79.896412 W
   ZIP Codes (1990):     27371
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Troy, NC
    Troy


U.S. Gazetteer Places (2000):

Troy, ID -- U.S. city in Idaho
   Population (2000):    798
   Housing Units (2000): 341
   Land area (2000):     0.794213 sq. miles (2.057003 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.794213 sq. miles (2.057003 sq. km)
   FIPS code:            82360
   Located within:       Idaho (ID), FIPS 16
   Location:             46.738571 N, 116.770785 W
   ZIP Codes (1990):     83871
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Troy, ID
    Troy


U.S. Gazetteer Places (2000):

Troy, OH -- U.S. city in Ohio
   Population (2000):    21999
   Housing Units (2000): 9497
   Land area (2000):     9.700614 sq. miles (25.124474 sq. km)
   Water area (2000):    0.067445 sq. miles (0.174682 sq. km)
   Total area (2000):    9.768059 sq. miles (25.299156 sq. km)
   FIPS code:            77588
   Located within:       Ohio (OH), FIPS 39
   Location:             40.041621 N, 84.208627 W
   ZIP Codes (1990):     45373
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Troy, OH
    Troy


U.S. Gazetteer Places (2000):

Troy, IL -- U.S. city in Illinois
   Population (2000):    8524
   Housing Units (2000): 3201
   Land area (2000):     4.183442 sq. miles (10.835065 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    4.183442 sq. miles (10.835065 sq. km)
   FIPS code:            76199
   Located within:       Illinois (IL), FIPS 17
   Location:             38.729236 N, 89.891733 W
   ZIP Codes (1990):     62294
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Troy, IL
    Troy


U.S. Gazetteer Places (2000):

Troy, IN -- U.S. town in Indiana
   Population (2000):    392
   Housing Units (2000): 197
   Land area (2000):     0.313997 sq. miles (0.813249 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.313997 sq. miles (0.813249 sq. km)
   FIPS code:            76634
   Located within:       Indiana (IN), FIPS 18
   Location:             37.993975 N, 86.799397 W
   ZIP Codes (1990):     47588
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Troy, IN
    Troy


U.S. Gazetteer Places (2000):

Troy, PA -- U.S. borough in Pennsylvania
   Population (2000):    1508
   Housing Units (2000): 617
   Land area (2000):     0.784113 sq. miles (2.030844 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.784113 sq. miles (2.030844 sq. km)
   FIPS code:            77584
   Located within:       Pennsylvania (PA), FIPS 42
   Location:             41.782180 N, 76.789561 W
   ZIP Codes (1990):     16947
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Troy, PA
    Troy


U.S. Gazetteer Places (2000):

Troy, KS -- U.S. city in Kansas
   Population (2000):    1054
   Housing Units (2000): 474
   Land area (2000):     0.715345 sq. miles (1.852734 sq. km)
   Water area (2000):    0.004739 sq. miles (0.012275 sq. km)
   Total area (2000):    0.720084 sq. miles (1.865009 sq. km)
   FIPS code:            71575
   Located within:       Kansas (KS), FIPS 20
   Location:             39.788099 N, 95.090840 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Troy, KS
    Troy


U.S. Gazetteer Places (2000):

Troy, SC -- U.S. town in South Carolina
   Population (2000):    105
   Housing Units (2000): 51
   Land area (2000):     0.799299 sq. miles (2.070174 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.799299 sq. miles (2.070174 sq. km)
   FIPS code:            72655
   Located within:       South Carolina (SC), FIPS 45
   Location:             33.986895 N, 82.295830 W
   ZIP Codes (1990):     29848
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Troy, SC
    Troy


U.S. Gazetteer Places (2000):

Troy, TN -- U.S. town in Tennessee
   Population (2000):    1273
   Housing Units (2000): 576
   Land area (2000):     1.419629 sq. miles (3.676821 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.419629 sq. miles (3.676821 sq. km)
   FIPS code:            75240
   Located within:       Tennessee (TN), FIPS 47
   Location:             36.340816 N, 89.156671 W
   ZIP Codes (1990):     38260
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Troy, TN
    Troy


U.S. Gazetteer Places (2000):

Troy, TX -- U.S. city in Texas
   Population (2000):    1378
   Housing Units (2000): 527
   Land area (2000):     3.556150 sq. miles (9.210386 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    3.556150 sq. miles (9.210386 sq. km)
   FIPS code:            73748
   Located within:       Texas (TX), FIPS 48
   Location:             31.202907 N, 97.301719 W
   ZIP Codes (1990):     76579
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Troy, TX
    Troy


U.S. Gazetteer Places (2000):

Troy, MI -- U.S. city in Michigan
   Population (2000):    80959
   Housing Units (2000): 30872
   Land area (2000):     33.538805 sq. miles (86.865102 sq. km)
   Water area (2000):    0.101965 sq. miles (0.264088 sq. km)
   Total area (2000):    33.640770 sq. miles (87.129190 sq. km)
   FIPS code:            80700
   Located within:       Michigan (MI), FIPS 26
   Location:             42.580141 N, 83.142980 W
   ZIP Codes (1990):     48083 48084 48098
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Troy, MI
    Troy