I meant programs produced specifically for Canadian television and simulcast or re-aired in the US. The only one I was aware of before was Due South. The first three you name seem to qualify. I didn't realize Rookie Blue was made for Canadian TV. In the US, it's aired as a "summer season" series on ABC, which means it's kind of second tier, but still valid. I'd never heard of Combat Hospital, but, again, it's apparently on ABC. Flashpoint, on the other hand, is on the Ion network, which I didn't realize was still in existence. I have issues with your characterization of it as seen "widely".

As far as The Firm goes, I was going to say that a lot of US TV has been produced in Canada for decades now, but it appears that it was actually made for Sony's non-North America channel AXN, and then picked up by NBC in the US and Global in Canada. Weird. I don't think I've ever heard of that before.