* United States:
* Great Plains: The largest herds live in national parks and refuges in states like Wyoming, Montana, South Dakota, North Dakota, Kansas, Nebraska, and Oklahoma.
* Other areas: Smaller herds are found in states like Colorado, Arizona, Texas, California, and even some eastern states.
* Canada:
* Alberta and Saskatchewan: The largest herds in Canada live in the grasslands of these provinces.
* Other areas: Smaller herds are found in Manitoba, British Columbia, and other provinces.
* Mexico:
* Northern Mexico: A small population exists in northern Mexico, mostly in the state of Chihuahua.
It is important to note that while bison were once widespread throughout North America, their numbers were drastically reduced during the 19th century due to hunting and habitat loss. Today, most bison are found in protected areas like national parks and refuges.
Conservation efforts are ongoing to restore bison populations and ensure their survival.