GreenTRIP Parking Database

The GreenTRIP Parking Database provides data from 80 multi-family residential sites around the San Francisco Bay Area. Data collection was completed in 2013 - 2014. The data shows parking supplied and parking used at each site. Use the parking database to search for sites similar to a project you have in mind and to see actual total parking used in a particular location or building type. Reports can be printed and shared freely with developers and decision-makers.

Access the Parking Database

How the Parking Database works: 

The GreenTRIP Parking Database provides information to support and guide decisions about parking supply and management. This database is a free resource that shows which projects have more parking than needed. More importantly, the detailed information in the database sheds light on reasons for why parking use fluctuates depending on location, unit affordability, transit access or resident access to onsite traffic reduction strategies. The purpose of the database is to inform discussions around required parking for a particular project or evaluations of parking and transportation policies in proposed Specific or Precise Plans. 

The parking data is the foundation for GreenTRIP Connect, for the parking module included for the Bay Area.  GreenTRIP Connect empowers users to predict driving and parking for future residents. By increasing the affordability of units and adding GreenTRIP strategies, users can see the reduction in parking, driving and greenhouse gas emissions instantly.

The GreenTRIP Parking Database is built for three key audiences:

City planners and policy decision makers evaluating parking provided in proposed development projects or parking policies in specific plans typically also need data on actual parking use for buildings in similar locations. They are also charged with guiding updates to zoning codes and parking requirements. We’ve worked with staff from a few key cities to ensure the database is designed to inform development of better land use policies.

Developers are often required by cities to commission a parking study to demonstrate the feasibility of reduced parking on a site. Developers can view the results of cost-effective strategies instead of poured concrete, including bulk purchase transit passes, car sharing arrangements, and parking pricing when parking spaces are unbundled from rent. With information on reduced parking needs of affordable housing in transit-rich locations, the database can assist developers who want to build more housing for people, not cars.

Community members, who for the first time, will have in their hands an easily searchable database with actual parking used in a variety of projects.  Too often, community members ask for MORE on-site parking from a project, thinking it will reduce spill-over on the community. In reality, more parking invites more cars and results in more traffic. Community members trying to shape proposed new projects will be able to find and suggest actual traffic reduction strategies used by existing projects and finding viable options that would work best in their own communities.

Regardless of who you are, we hope that you will find the information to be a valuable resource.

Give feedback on the Parking Database.


Supported by an award from the U.S. Department of Housing and Urban Development, the Metropolitan Transportation Commission (MTC) partially funded the research that served as the basis for this database.

The substance and findings of the work are dedicated to the public. The author and publisher are solely responsible for the accuracy of the statements and interpretations contained in this publication. Such interpretations do not necessarily reflect the views of the federal government or MTC.

Frequently Asked Questions

What data are you collecting at each site?

Here is a sample of the data form that is filled out for each site where we collect middle of the night parking counts.

Can I give feedback on the GreenTRIP Parking Database?

We are interested in feedback from potential users of the database: developers, city staff, and community groups. Go to this form to give feedback. 

How can I add a new site to the Database?

Go to this form to send a message to TransForm’s GreenTRIP staff if you would like your property to be included in the database. 

 For more information, contact Jennifer West

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