Laurentian - St. Jerome, Quebec.
Also known as LP and Laurentian Art Pottery and Poterie Laurentienne. These pieces are variously marked, sometimes with LP (looks like a stylized coffee mug in a circle), other times with the LP mark and Laurentian, sometimes Quebec, sometimes Canada, usually with a mold-mark item number.
A later mark is a "three trees" logo. Laurentian Pottery founded in 1939 by a Mr. Kominick. Unconfirmed, but I believe this pottery closed sometime c. 2005.