A Piaggio is also seen fairly often in Ottawa. A quick check of the Transport Canada database shows C-GFOX registered to the RCMP, likely the one seen in Ottawa. There are a total of 10 P-180s on the Canadian Civil Register. One is based in Brantford, owned by a numbered company in Wingham, possibly the one seen in Hamilton area, others in Quebec (province), Toronto, London, Alberta.
The TC register is at
http://www.tc.gc.ca/aviation/activepages/ccarcs/en/ You may have to play with the link to make it work.