About 343:
Area code 343 was first put in service May 17, 2010. Currently, the largest city it serves is Ottawa, ON, and it overlaps coverage areas with area code 613.
Related Cities:
Area codes 613 and 343 cover eastern Ontario and the Ottawa area, including the larger communities of Bancroft, Belleville, Brockville, Carleton Place, Cornwall, Kingston, Pembroke, Perth, Smith Falls and Trenton, plus many smaller communities in eastern Ontario.