'Lucas Valley' definitions:

Lucas Valley-Marinwood, CA -- U.S. Census Designated Place in California

From: Gazetteer 2000
Name :
Lucas Valley-Marinwood, CA -- U.S. Census Designated Place in California
Population (2000) :
6357
Housing Units (2000) :
2392
Land area (2000) :
5.604390 sq. miles (14.515303 sq. km)
Water area (2000) :
0.000000 sq. miles (0.000000 sq. km)
Total area (2000) :
5.604390 sq. miles (14.515303 sq. km)
FIPS code :
44399
Located within :
California (CA), FIPS 06
Location :
38.027989 N, 122.562783 W
Note :
some ZIP codes may be omitted esp. for suburbs.