After you find it on the map click on the link to the website or call them. Click on the link
You'll have to check the website.
Go to the website and and mark your departure and destination as if you would buy the ticket. It will show you the times of departure and even what type of Greyhound will running (express or not). Or you can just go and ask the people at the counter. Buying tickets online is cheaper than over the counter.
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