Local hotel owner George Kittredge convinced the U.S. Post Office to reinstate the "U" in the late 1800's, apparently in hopes of boosting business, but the spelling was reverted after his death.

By the late 1890s, it had become a tourist town, drawing summer visitors from points south, notably Boston, who escaped the heat in Mont Vernon's hills.

The hotel business began to wither with the development of the automobile, which allowed tourists to reach places like the White Mountains of New Hampshire, and it was killed by the Great Depression.

This was significantly accelerated in 1962–1963 when engineers and technicians employed at Sanders Associates in Nashua found homes in Mont Vernon attractive.

[6] Mont Vernon made national news in March 2012 due to debate during the annual town meeting over whether to rename a small fishing hole called Jew Pond.

The northwestern corner of town is drained by Lords Brook, a northward-flowing tributary of the South Branch Piscataquog River.

The town's highest point is on its northern border, at 1,015 feet (309 m) above sea level, near the summit of Storey Hill.

Mont Vernon is served by one state highway, New Hampshire Route 13, which runs north-south through the center of town connecting Milford and New Boston.

For seventh and eighth grades, Mont Vernon sends its students to Amherst Middle School.

[13] Mont Vernon had a private school that started as the Appleton Academy in 1853 and was renamed the McCollom Institute in 1871, which closed shortly before the turn of the century.

[14] The former two-story Mont Vernon Fire Station, built in 1947, was located on North Main Street next to the Town Hall.

In March 2007 the town voted to raze the deteriorating building and replace it with a new fire station on the same lot.

[15] Mont Vernon made national news on October 4, 2009, when a home invasion in the town resulted in the murder of Kimberly Cates.

The town owns land near the school that has a baseball field with bases, fencing and two dugouts.

Mont Vernon is known for views over the Souhegan Valley and has hiking trails, especially in town-owned Lamson Farm and along Purgatory Brook, which forms most of its western border.