structural:scholar_edition, information:highlighting, stylistic:tone, quality:corruption
Western painted turtle

The western painted turtle's northern range includes southern parts of western Canada from Ontario through Manitoba, Saskatchewan, Alberta and British Columbia. In Ontario, the western subspecies is found north of Minnesota and directly north of Lake Superior, but there is a 130 km (80 mi) gap to the east of Lake Superior (in the area of harshest winter climate) where no painted turtles of any subspecies occur. Thus Ontario's western subspecies does not intergrade with the midland painted turtle of southeastern Ontario. In Manitoba, the turtle is numerous and ranges north to Lake Manitoba and the lower part of Lake Winnipeg. The turtle is also common in south Saskatchewan, but in Alberta, there may only be 100 individuals, all found very near the U.S. border, mostly in the southeast.

In British Columbia, populations exist in the interior in the vicinity of the Kootenai, Columbia, Okanagan, and Thompson river valleys. At the coast, turtles occur near the mouth of the Fraser and a bit further north, as well as the bottom of Vancouver Island, and some other nearby islands. Within British Columbia, the turtle's range is not continuous and can better be understood as northward extensions of the range from the United States. High mountains present barriers to east–west movement of the turtles within the province or from Alberta. Some literature has shown isolated populations much further north in British Columbia and Alberta, but these were probably pet-releases.

In the United States, the western subspecies forms a wide intergrade area with the midland subspecies covering much of Illinois as well as a strip of Wisconsin along Lake Michigan and part of the Upper Peninsula of Michigan (UP). Further west, the rest of Illinois, Wisconsin and the UP are part of the range proper, as are all of Minnesota and Iowa, as well as all of Missouri except a narrow strip in the south. All of North Dakota is within range, all of South Dakota except a very small area in the west, and all of Nebraska. Almost all of Kansas is in range; the border of that state with Oklahoma is roughly the species range border, but the turtle is found in three counties of north central Oklahoma.

To the northwest, almost all of Montana is in range. Only a narrow strip in the west, along most of the Idaho border (which is at the Continental Divide) lacks turtles. Wyoming is almost entirely out of range; only the lower elevation areas near the eastern and northern borders have painted turtles. In Idaho, the turtles are found throughout the far north (upper half of the Idaho Panhandle). Recently, separate Idaho populations have been observed in the southwest (near the Payette and Boise rivers) and the southeast (near St. Anthony). In Washington state, turtles are common throughout the state within lower elevation river valleys. In Oregon, the turtle is native to the northern part of the state throughout the Columbia River Valley as well as the Willamette River Valley north of Salem.

To the southwest, the painted turtle's range is fragmented. In Colorado, while range is continuous in the eastern, prairie, half of the state, it is absent in most of the western, mountainous, part of the state. However, the turtle is confirmed present in the lower elevation southwest part of the state (Archuleta and La Plata counties), where a population ranges into northern New Mexico in the San Juan River basin. In New Mexico, the main distribution follows the Rio Grande and the Pecos River, two waterways that run in a north–south direction through the state. Within the aforementioned rivers, it is also found in the northern part of Far West Texas. In Utah, the painted turtle lives in an area to the south (Kane County) in streams draining into the Colorado River, although it is disputed if they are native. In Arizona, the painted turtle is native to an area in the east, Lyman Lake. The painted turtle is not native to Nevada or California.

In Mexico, painted turtles have been found about 50 miles south of New Mexico near Galeana in the state of Chihuahua. There, two expeditions found the turtles in the Rio Santa Maria which is in a closed basin.