What is the busiest individual bus line in your city?

[Cirrus]

Hi. I'd like to build a list of the most heavily-ridden individual bus lines in each US urbanized area. Throw in Canada too. If you know this information for any city, please provide it here (round to the nearest thousand)! If possible please provide a reference, but I'll take it on hearsay if that's all you've got.

I'm compiling the data using this google spreadsheet, and am also getting some responses via twitter, so you will see numbers on the spreadsheet that don't come from this thread.

Thank you!