Table 4
Workers by Means of Transportation to Work – 1980 - 2000
1980 - 2000 Decennial Censuses
                 
County Drive Work Total
of Residence   Alone Carpool Transit Walk Other at Home Workers
1980 311,329 80,722 63,326 24,059 17,247 8,767 505,450
% of Tot 61.6% 16.0% 12.5% 4.8% 3.4% 1.7% 100.0%
  1990 422,775 80,773 63,138 25,136 16,483 24,886 633,191
Alameda % of Tot 66.8% 12.8% 10.0% 4.0% 2.6% 3.9% 100.0%
2000 450,496 93,652 72,174 21,919 16,728 23,941 678,910
  % of Tot 66.4% 13.8% 10.6% 3.2% 2.5% 3.5% 100.0%
1980 199,707 53,165 25,794 6,851 7,603 5,634 298,754
% of Tot 66.8% 17.8% 8.6% 2.3% 2.5% 1.9% 100.0%
Contra 1990 286,754 55,488 31,344 7,371 6,563 13,653 401,173
Costa % of Tot 71.5% 13.8% 7.8% 1.8% 1.6% 3.4% 100.0%
2000 310,286 59,769 39,652 6,631 6,694 18,976 442,008
  % of Tot 70.2% 13.5% 9.0% 1.5% 1.5% 4.3% 100.0%
1980 69,783 19,349 13,500 4,220 5,022 3,814 115,688
% of Tot 60.3% 16.7% 11.7% 3.6% 4.3% 3.3% 100.0%
  1990 82,714 15,535 12,899 3,739 2,031 8,162 125,080
Marin % of Tot 66.1% 12.4% 10.3% 3.0% 1.6% 6.5% 100.0%
2000 82,898 13,597 12,797 3,835 2,392 11,127 126,646
  % of Tot 65.5% 10.7% 10.1% 3.0% 1.9% 8.8% 100.0%
1980 28,655 7,186 750 2,484 1,531 1,084 41,690
% of Tot 68.7% 17.2% 1.8% 6.0% 3.7% 2.6% 100.0%
  1990 38,766 6,605 570 2,619 1,121 1,892 51,573
Napa % of Tot 75.2% 12.8% 1.1% 5.1% 2.2% 3.7% 100.0%
2000 41,698 8,519 803 2,378 1,080 2,915 57,393
  % of Tot 72.7% 14.8% 1.4% 4.1% 1.9% 5.1% 100.0%
1980 113,724 42,028 129,683 36,823 6,829 7,540 336,627
% of Tot 33.8% 12.5% 38.5% 10.9% 2.0% 2.2% 100.0%
San 1990 147,187 43,925 128,160 37,611 10,947 14,479 382,309
Francisco % of Tot 38.5% 11.5% 33.5% 9.8% 2.9% 3.8% 100.0%
2000 169,508 45,152 130,311 39,192 15,014 19,376 418,553
  % of Tot 40.5% 10.8% 31.1% 9.4% 3.6% 4.6% 100.0%
1980 210,558 50,577 24,137 8,093 7,561 4,907 305,833
% of Tot 68.8% 16.5% 7.9% 2.6% 2.5% 1.6% 100.0%
San 1990 251,218 45,104 25,788 8,858 6,059 9,532 346,559
Mateo % of Tot 72.5% 13.0% 7.4% 2.6% 1.7% 2.8% 100.0%
2000 256,066 45,367 26,029 7,609 6,180 12,845 354,096
  % of Tot 72.3% 12.8% 7.4% 2.1% 1.7% 3.6% 100.0%
1980 470,652 107,639 20,115 16,757 24,104 10,310 649,577
% of Tot 72.5% 16.6% 3.1% 2.6% 3.7% 1.6% 100.0%
Santa 1990 618,995 98,163 23,727 16,509 19,225 19,986 796,605
Clara % of Tot 77.7% 12.3% 3.0% 2.1% 2.4% 2.5% 100.0%
2000 641,113 101,188 29,118 14,786 16,854 25,868 828,927
  % of Tot 77.3% 12.2% 3.5% 1.8% 2.0% 3.1% 100.0%
1980 65,650 23,232 1,879 4,298 3,599 1,353 100,011
% of Tot 65.6% 23.2% 1.9% 4.3% 3.6% 1.4% 100.0%
  1990 114,233 29,320 3,604 3,916 3,460 4,180 158,713
Solano % of Tot 72.0% 18.5% 2.3% 2.5% 2.2% 2.6% 100.0%
2000 127,896 30,973 4,662 2,784 2,815 5,441 174,571
  % of Tot 73.3% 17.7% 2.7% 1.6% 1.6% 3.1% 100.0%
1980 88,591 20,829 4,093 5,422 4,391 4,358 127,684
% of Tot 69.4% 16.3% 3.2% 4.2% 3.4% 3.4% 100.0%
  1990 142,074 24,760 4,351 6,209 3,721 9,316 190,431
Sonoma % of Tot 74.6% 13.0% 2.3% 3.3% 2.0% 4.9% 100.0%
2000 168,134 28,283 5,507 6,929 3,848 12,246 224,947
  % of Tot 74.7% 12.6% 2.4% 3.1% 1.7% 5.4% 100.0%
1980 1,558,649 404,727 283,277 109,007 77,887 47,767 2,481,314
% of Tot 62.8% 16.3% 11.4% 4.4% 3.1% 1.9% 100.0%
Bay 1990 2,104,716 399,673 293,581 111,968 69,610 106,086 3,085,634
Area % of Tot 68.2% 13.0% 9.5% 3.6% 2.3% 3.4% 100.0%
2000 2,248,095 426,500 321,053 106,063 71,605 132,735 3,306,051
  % of Tot 68.0% 12.9% 9.7% 3.2% 2.2% 4.0% 100.0%
Sources:   U.S. Bureau of the Census, Decennial Censuses – 1980, 1990, 2000
                  Summary Tape File 3A (1980-1990) and Demographic Profile 2, 3, 4 (2000)