The width of the middle part of North America varies depending on the specific location you measure. However, one commonly referenced measurement is the width of the continent from the eastern coast to the western coast at its approximate middle latitude.
From the Atlantic Ocean (east coast) to the Pacific Ocean (west coast) at the approximate central latitude of North America (around 40° N), the width is roughly 2,500 to 3,000 miles (4,000 to 4,800 kilometers). This measurement is not exact because of the continent’s irregular shape, but it provides a general idea of the span across the central part of North America.