Tri Delta Transit

Tri Delta Transit provides over 2,500,000 trips each year to a population of nearly 315,000 residents in the 225 square miles of Eastern Contra Costa County. Tri Delta Transit operates 14 local bus routes Monday-Friday, 4 local bus routes on weekends, on-demand ride share service Tri MyRide, Express Route 300 commuter route, and a paratransit door-to-door bus service for senior and disabled individuals. With connections to BART, County Connection, WestCAT and the Capital Corridor, Tri Delta Transit takes you to where you want to go and connects you to the people, places and things that you love around town and throughout the Bay Area.

801 Wilbur Avenue, Antioch, CA, 94509

Transit Centers

There are 3 Transit Centers that serve Tri Delta Transit.

View Transit Centers

Transit Accessibility Services

Tri Delta Transit's fixed-route buses are wheelchair accessible, have tie-downs for wheelchairs, and priority seating available for senior and disabled individuals.

Tri Delta Transit also operates a paratransit service called Dial-a-Ride. Dial-a-Ride is a door-to-door transportation service for eligible senior and disabled individuals traveling in Eastern Contra Costa County. Tri Delta Transit's paratransit service follows the regional paratransit guidelines and offers both ADA and Non-ADA service to qualifying individuals. For more information on Dial-a-Ride, please call 925-754-6622.

Visit Tri Delta Transit's Tri Delta Transit Paratransit Website
Learn More on ADA Paratransit

RTC Regional Discount Card

RTC Processing Location

Customer Services: 801 Wilbur Avenue, Antioch, CA 94509

Phone: (925) 754-6622; TTY (925) 754-3695

Applications accepted Monday through Thursday 7 am – 6 pm, and Friday 8 am – 5 pm

Note: Before visiting a transit agency office, call to verify hours of operation and payment options.

TTY Users: You can contact any telephone number through the California Relay Service at 711.

Learn More on RTC Regional Discount Card

Bicycle Access

Learn More about Bicycle Access on Tri Delta Transit

511 Phone Service

From the Main Menu, use a shortcut to go directly to Tri Delta Transit by saying: "Tri Delta Transit"

From inside the Transit Agency menu, you can say any of the following agencies. If you want to use the touch-tone options, press the number "22" for Tri Delta Transit.

From inside the Paratransit Agency menu, you can say any of the following agencies. If you want to use the touch-tone options, press the number "24" for Tri Delta Transit Paratransit for Eastern Contra Costa County.

Learn More about the 511 Phone Service


Clipper is currently accepted on Muni, BART, AC Transit, VTA, SamTrans, Caltrain and Golden Gate Transit and Ferry, and will eventually be accepted on all forms of Bay Area public transit. For information on using Clipper, please visit

Learn More about the Clipper Card and 511

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