Are there volcanoes east of Mississippi River

There are no recent volcanic structures east of the Mississippi, but there are several ancient volcanic structures in the eastern U.S. For example, Stark's Knob near Saratoga Springs, N.Y., is an Ordivician-age undersea volcanic vent "clogged" with pillow lava. The Ossipee Mountains of New Hampshire are actually the remnants of a circular ring dike, the roots of a large volcanic caldera (famous Crystal Springs Bottled Water is located atop the caldera). Prehistoric lavas and vents can be found in the White Mountains of New Hampshire and in eastern Vermont and Maine, too. But there are certainly many other volcanic features and lavas in New England and the rest of the Appalalchian region. Contact state geologists; they can help you find them.