The Collaborative International Dictionary of English v.0.48:

Rockwood \Rock"wood`\, n. (Min.)
   Ligniform asbestus; also, fossil wood.
   [1913 Webster]

U.S. Gazetteer Places (2000):

Rockwood, IL -- U.S. village in Illinois
   Population (2000):    41
   Housing Units (2000): 13
   Land area (2000):     0.211479 sq. miles (0.547729 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.211479 sq. miles (0.547729 sq. km)
   FIPS code:            65221
   Located within:       Illinois (IL), FIPS 17
   Location:             37.839069 N, 89.696740 W
   ZIP Codes (1990):     62280
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Rockwood, IL
    Rockwood


U.S. Gazetteer Places (2000):

Rockwood, PA -- U.S. borough in Pennsylvania
   Population (2000):    954
   Housing Units (2000): 421
   Land area (2000):     0.312443 sq. miles (0.809223 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.312443 sq. miles (0.809223 sq. km)
   FIPS code:            65736
   Located within:       Pennsylvania (PA), FIPS 42
   Location:             39.916222 N, 79.155808 W
   ZIP Codes (1990):     15557
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Rockwood, PA
    Rockwood


U.S. Gazetteer Places (2000):

Rockwood, TN -- U.S. city in Tennessee
   Population (2000):    5774
   Housing Units (2000): 2729
   Land area (2000):     7.894780 sq. miles (20.447385 sq. km)
   Water area (2000):    0.052400 sq. miles (0.135716 sq. km)
   Total area (2000):    7.947180 sq. miles (20.583101 sq. km)
   FIPS code:            64440
   Located within:       Tennessee (TN), FIPS 47
   Location:             35.869147 N, 84.675176 W
   ZIP Codes (1990):     37854
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Rockwood, TN
    Rockwood


U.S. Gazetteer Places (2000):

Rockwood, MI -- U.S. city in Michigan
   Population (2000):    3442
   Housing Units (2000): 1353
   Land area (2000):     2.704118 sq. miles (7.003634 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    2.704118 sq. miles (7.003634 sq. km)
   FIPS code:            69180
   Located within:       Michigan (MI), FIPS 26
   Location:             42.072123 N, 83.244384 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Rockwood, MI
    Rockwood