I think Grey County Transit from what I've read had
28,000 riders in 2024, on its four routes, with four round trips per day on each route. There were another 3,000 I think on its fifth route, which was cut in the fall, for about 31,000 total. That's about 85 riders per day on all five routes.
Note that routes 1/2 and 3/4 were just continuations of each other, so it was really just two long routes, and not four shorter ones. I don't know if they counted riders twice if they stayed on route 2 after it transitioned from route 1. If they weren't double counted, that's 14,000 riders per route per year, or about 47 per day per route, or about 6 per one-way trip (3 per trip if they were all double counted).
The GOST Guelph-Owen Sound bus is a separate service that is also losing funding. It carried 12,000 per year last year (2 round trips per day), but has been
extended until March 2026 with money leftover from its original grant.
(EDIT: I realized Grey County eliminated weekend service on May 1st, 2024, so I corrected the math to account for the fewer days.)