The list includes 20 peaks in Maine, 15 in Vermont, 14 in New Hampshire, and one in Massachusetts.
For instance, only one peak in the Presidential Range is on this list because the others do not have a major prominence, being connected to Mount Washington by ridgelines that are nowhere below 4,900 ft (1,490 m).
Mount Washington has an elevation above sea level of 6,288 ft (1,917 m) but has a prominence of about 6,150 ft (1,875 m) because it stands that high above its key col — the lowest ground on the ridge line connecting Washington to the higher peaks of the southern Appalachian Mountains.
Washington's key col is at the Champlain Canal in New York, the lowest ground on the water divide between the watersheds of the Hudson and Saint Lawrence Rivers.
The list includes several monadnocks, including the eponymous Mount Monadnock, and the high points of several small mountain ranges which have high prominence by virtue of their isolation from higher peaks by surrounding low ground.