Open Transit Data (OTD)

Do you love transit? Do you love data? Then you’ve come to the right place.

Open Transit Data (OTD) is the bank of publicly-accessible transit data for the Puget Sound region managed by Sound Transit

What it is

Free and accessible - we ask that you agree to our terms of service but beyond that you are free to use the data how and when you like. Request an API key or download the files.

A community - people that love transit, people that like to work with data, people that help build things. See our resources sidebar for where and how to find your peeps.

What it isn't

Static - at a minimum, most agencies issue a service change twice a year. Some are constantly tweaking routes, stops and schedules. We strive to keep it current, but it is constantly evolving.

Comprehensive - we continue to add services and agencies, including expanding the real-time offerings.

Who it's for

Anyone that has an interest in transit data, from students interested in maps and urban planning to developers looking to produce the next great app that will blow everyone away. Maybe you just want to code a little more efficiency into your own commute!

Data quality

Transit Data is an ever evolving thing and as the data moves between systems unfortunate errors can occur. Tracking down the problem's point of entry, fixing it, and repopulating the flow takes time. We also strive to make improvements to help the data flow - things like stop consolidations that can help make the data less confusing. To report a new issue please email the details to