Northeastern United States:
- New England: Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, and most of Connecticut were covered by glaciers.
- New York: The northern and western parts of New York State were glaciated, including areas around the Adirondack Mountains and the Finger Lakes region.
- Pennsylvania: The northern and central regions of Pennsylvania were covered by glaciers.
Midwest:
- Minnesota: Much of Minnesota was covered by glaciers, shaping the state's numerous lakes and creating the Mississippi River headwaters.
- Wisconsin: The entire state of Wisconsin was under the ice sheets, and the movement of glaciers carved out unique landforms such as the Kettle Moraine.
- Michigan: Most of Michigan, except for the southernmost part, was glaciated. This left behind many lakes, including the Great Lakes.
- Illinois: The northern half of Illinois was impacted by glaciers.
- Iowa: The northern and central parts of Iowa were covered by glaciers.
Rocky Mountains:
- Montana: Large portions of Montana were glaciated, particularly in the western and northwestern regions.
- Idaho: The northern half of Idaho was covered by glaciers, forming features like Lake Pend Oreille and the Sawtooth Mountains.
- Washington: The Cascade Range and Puget Sound region were under glacial ice.
- Wyoming: Glacial impacts can be seen in Yellowstone National Park and the Grand Teton Range.
These are just a few examples of the regions in the United States that were covered by glaciers during the Pleistocene Ice Age. The retreat of these glaciers and their meltwater played a significant role in shaping the geological features, water bodies, and landscapes of the country.