 st. lawrence county is a county located in the u.s. state of new york. as of the 2010 census, the population was 111,944. the county seat is canton. the county is named for the saint lawrence river, which in turn was named for the catholic saint on whose feast day the river was discovered by french explorers. st. lawrence county is the largest county by area in new york (new york county is the smallest). st. lawrence county comprises the ogdensburg-massena, ny micropolitan statistical area. ==history== when counties were established in new york state in 1683, the present st. lawrence county was part of albany county. this was an enormous territory, including the northern part of new york state as well as all of the present state of vermont and, in theory, extending westward to the pacific ocean. the county was reduced in size on july 3, 1766 by the creation of cumberland county, and further on march 16, 1770 by the creation of gloucester county, both containing territory now in vermont. on march 12, 1772, what was left of albany county was split into three parts, one remaining under the name albany county. the other two were called tryon county (later renamed montgomery county) and charlotte county (later renamed washington county). tryon county contained the western portion (and, since no western boundary was specified, theoretically extended west to the pacific). the eastern boundary of tryon county was approximately five miles west of the present city of schenectady, and the county included the western part of the adirondack mountains and the area west of the west branch of the delaware river. the area then designated as tryon county includes what are now 37 counties of ne
1802_establishments_in_New_York New_York_counties Populated_places_established_in_1802 St._Lawrence_County,_New_York