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Census 2000 Supplementary Survey (C2SS)
San Francisco Bay Area

The Census Bureau released data from the Census 2000 Supplementary Survey (C2SS) on November 20, 2001. The C2SS is a small-sample survey of 700,000 households in the U.S., with about 15,300 households interviewed in the Bay Area. Data is only available for large counties and cities with 250,000+ population.

Transportation-Related Highlights of the C2SS for the Bay Area:

  • Transit commute shares are on the rise: from 9.5 percent of all commuters in 1990 to about 10.6 percent of all commuters in 2000.
  • Work-at-home commute shares are also on the rise: from 3.4 percent of all commuters in 1990 to about 4.0 percent in 2000.
  • Driving alone, carpooling and bicycling to work shares are stable, 1990 to 2000.
  • Walk-to-work shares are decreasing, from 3.6 percent of commuters in 1990 to 2.8 percent of commuters in 2000.
  • The average Bay Area commute is about 3 minutes longer in 2000, increasing from 25.6 minutes in 1990 to 28.4 minutes in 2000.
  • Contra Costa County resident workers have the longest average commute in the Bay Area (34.4 minutes), and the longest commute in the Western U.S.
  • The share of workers commuting greater than 60 minutes increased from 8.1 percent of commuters in 1990 to 11.2 percent in 2000.
  • Mean household income in the Bay Area increased by 17 percent between 1990 and 2000, from $71,100 to $83,200.
  • The share of households without vehicles declined from 10.5 percent of regional households in 1990 to 9.0 percent of regional households in 2000.

Regular Census 2000 "long form" data will be released starting summer 2002. The regular "long form" was completed by about 308,000 Bay Area households, and data will be provided at a much finer level of geography.


Table 1
Share of Workers by Means of Transportation to Work
San Francisco Bay Area (Nine-County Region)
Census 2000 Supplementary Survey (C2SS) and Decennial Censuses
       
Means of Transportation to Work 1980 1990 2000
Drive Alone 62.8% 68.2% 67.6%
Carpool 16.3% 13.0% 12.9%
Transit 11.4% 9.5% 10.6%
Walk 4.4% 3.6% 2.8%
Bicycle NA 1.1% 1.1%
Other 3.1% 1.2% 1.0%
Work at Home 1.9% 3.4% 4.0%
Total 100.0% 100.0% 100.0%
Table 2
Average Commute Duration (one-way in minutes) by County of Residence
San Francisco Bay Area (Nine-County Region)
Census 2000 Supplementary Survey (C2SS) and Decennial Censuses
         
County of Residence 1980 1990 2000 2000, standard error
Alameda 24.6 25.8 30.0 +/- 0.8
Contra Costa 27.2 29.3 34.4 +/- 1.6
Marin 28.7 28.4 30.4 +/- ~3.0
Napa 19.7 21.4 22.5 +/- ~3.0
San Francisco 25.9 26.9 29.6 +/- 0.7
San Mateo 22.8 24.0 25.6 +/- 1.2
Santa Clara 22.8 23.3 25.0 +/- 0.7
Solano 22.2 28.2 30.5 +/- 2.6
Sonoma 22.7 24.1 25.4 +/- 2.1
Bay Area 24.3 25.6 28.4 +/- 0.5
Table 3
Share of Commuters by Commute Duration
San Francisco Bay Area (Nine-County Region)
Census 2000 Supplementary Survey (C2SS) and Decennial Censuses
       
Commute Duration 1980 1990 2000
< 20 minutes 43.5% 41.0% 36.8%
20 - 29 minutes 21.2% 20.3% 20.3%
30 - 44 minutes 20.5% 21.7% 21.2%
45 - 59 minutes 7.7% 8.8% 10.4%
 60 + minutes 7.1% 8.1% 11.2%
Total 100.0% 100.0% 100.0%
Table 4
General Socio-Economic Characteristics
San Francisco Bay Area (Nine-County Region)
Census 2000 Supplementary Survey (C2SS) and Decennial Censuses
       
Characteristic 1980 1990 2000
Total Population 5,179,800 6,023,600 6,783,800
Households 1,970,500 2,246,200 2,466,000
Mean Household Income (1999 $) $60,200 $71,100 $83,200
Commuters 2,481,300 3,085,600 3,339,300
Table 5
Share of Households by Vehicles Available
San Francisco Bay Area (Nine-County Region)
Census 2000 Supplementary Survey (C2SS) and Decennial Censuses
       
Share of Households by Vehicles 1980 1990 2000
Zero Vehicle Households 12.2% 10.5% 9.0%
Single Vehicle Households 35.8% 32.5% 32.4%
Two Vehicle Households 32.6% 36.5% 37.0%
Three-or-More Vehicle Households 19.4% 20.5% 21.7%
Total 100.0% 100.0% 100.0%
Table 6
Completed Interviews for C2SS and Census 2000 Long Form
San Francisco Bay Area (Nine-County Region)
Census 2000 Supplementary Survey (C2SS) and Decennial Censuses
     
County C2SS Long Form
Alameda 1,905 65,400
Contra Costa 1,354 43,000
Marin ~250 12,600
Napa ~250 5,700
San Francisco 7,165 41,200
San Mateo 975 31,800
Santa Clara 2,212 70,700
Solano 500 16,300
Sonoma 686 21,600
Bay Area ~15,300 308,300
Note: Long form completions are MTC estimates based on 1-in-8 sample rate of Bay Area
     households. Census 2000 long form data will be available in summer 2002.
The Census 2000 Supplementary Survey (C2SS) is a nationwide test of the "American Community
Survey" (ACS). The C2SS was conducted throughout the year 2000. Approximately 700,000
households were interviewed.

For more information on Census 2000 Supplementary Survey (C2SS) data, visit the Census Bureau's C2SS web site at: http://www.census.gov/c2ss/www/.

Additional C2SS data is on MTC's FTP site. Point your web browser to: ftp://ftp.abag.ca.gov/pub/mtc/census2000/C2SS/


Created: December 11, 2001
Updated: December 14, 2001
MTC Contact: David Ory, 510.817.5755, e-mail: dory@mtc.ca.gov.


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