Canada Post employees in two Prince Edward Island communities and Joliette, Que., are joining the country-wide rotating strikes a day after about 6,000 workers walked off the job in Montreal.
The Canadian Union of Postal Workers says walkouts started in Charlottetown and Summerside, P.E.I., on Wednesday just after midnight local time, and at 1 a.m. ET in Joliette.
CUPW says the Montreal walkout ended Tuesday night, but another 15 communities across the country were still taking part in the 24-hour strikes.
CUPW says the Ontario communities of Cobourg, Fort Frances, Kapuskasing, Kenora, Petawawa-Deep River, Peterborough and Tri Town are still on strike.
The union says walkouts in British Columbia continue in Dawson Creek, Columbia River, Fort Nelson, Fort St. John and Nelson.
Meanwhile, the Saskatchewan cities of Saskatoon, Moose Jaw and Weyburn are also affected.
CUPW and the postal service have been unable to reach new collective agreements for the two bargaining units in 10 months of negotiations.
Last Tuesday, Labour Minister Patty Hajdu appointed Morton Mitchnick, a former chair of the Ontario Labour Relations Board, to help the two parties resolve their contract differences.