American Community Survey
Average travel time to work in the United States by metro area
Data available by metro area.
California Energy Commision
Public Transit in California
Data available for urban areas.
California Transit Association
Select “Customers” then “total passengers by county” on data page.
Data available by counties.
GTFS Data Exchange
Transit Agencies Providing GTFS Data
View by Agency and city or state.
An easy-to-use mapping program that includes over 15,000 US demographic and socioeconomic data indicators from the neighborhood census block to national levels. Data may be downloaded to csv.