The Collaborative International Dictionary of English v.0.48:

Acton \Ac"ton\, n. [OF. aketon, auqueton, F. hoqueton, a quilted
   jacket, fr. Sp. alcoton, algodon, cotton. Cf. Cotton.]
   A stuffed jacket worn under the mail, or (later) a jacket
   plated with mail. [Spelled also hacqueton.] [Obs.]
   --Halliwell. Sir W. Scott.
   [1913 Webster]

U.S. Gazetteer Places (2000):

Acton, CA -- U.S. Census Designated Place in California
   Population (2000):    2390
   Housing Units (2000): 873
   Land area (2000):     4.642310 sq. miles (12.023528 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    4.642310 sq. miles (12.023528 sq. km)
   FIPS code:            00212
   Located within:       California (CA), FIPS 06
   Location:             34.472777 N, 118.183696 W
   ZIP Codes (1990):     93510
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Acton, CA
    Acton