1. The Town of Newport was founded on May 10, 1761. It was named after Newport, Rhode Island, and was one of the earliest colonial settlements in New Hampshire.

2. On May 10, 1869, the Contoocook Valley Railroad was completed, connecting Concord to Hillsborough, New Hampshire. This allowed for easier transportation of goods and people in the region.

3. The first public library in Portsmouth, New Hampshire, opened on May 10, 1881. The library was located in a building on Parrott Avenue and had 5,000 volumes.

4. On May 10, 1900, the Great Fire of Portsmouth occurred. It destroyed over 400 buildings in the city's downtown area, causing millions of dollars in damage.

5. On May 10, 1933, the Old Man of the Mountain was formally named as the state's official emblem. The iconic natural rock formation was a symbol of New Hampshire for over 200 years before the formation collapsed in 2003.