[3] One published theory holds that the community's name refers to Windham, Ireland, harkening back to the petitioners' homeland.

However, it has been alternatively postulated that the town was named after Sir Charles Wyndham, 2nd Earl of Egremont, a member of Parliament from 1734 to 1750, Secretary of State for the Southern Department from 1761 to 1763, and a good friend of Governor Wentworth.

[5] The architect, Henry Vaughn, modeled the castle's architecture after the style of the Stanton Harcourt Manor in Oxfordshire, England.

[5] In July 1909, Mr. Searles erected a commemorative plaque honoring Governor Dinsmoor "a few rods" from his birthplace on Jenny's Hill,[6] which stands today as a designated historic landmark.

[3][7] In 2021, Windham attracted attention in the wake of the attempts to overturn the results of the 2020 United States presidential election.

The results of the recount prompted the New Hampshire General Court to authorize an audit of Windham's ballot counting machines and hand tabulations.

When Windham declined to select an auditor endorsed by supporters of President Donald Trump, about 500 supporters marched at a town board meeting, protesting alleged incidents of fraud and forcing the meeting to be moved to a local high school.

[9] Windham is situated in Rockingham County in southeastern New Hampshire, approximately 3 miles (5 km) north of the Massachusetts border.

[10] Windham is considered a bedroom community because of its growing population (over 10,000), only about 160 commercial land parcels, and lack of public transportation.

[10] The landscape of Windham consists of suburban subdivisions, rural open spaces and large areas of undeveloped land.

Cobbetts Pond is east of the geographic center of town, while Canobie Lake is on the eastern border.

The highest point is Jenny's Hill in the northeastern part of town, at 505 feet (154 m) above sea level.

The town posted one of the largest swings towards Hillary Clinton from Barack Obama, and Joe Biden put up the best performance for a presidential Democrat in Windham as far back as records are available (1972).

In the New Hampshire Senate, Windham sits in District 19, currently represented by Republican Regina Birdsell.

Windham High School, home to the Jaguars, consists of grades nine through twelve and opened in the fall of 2009.

[19] Windham includes a variety of local attractions such as municipal parks, golf courses, tennis courts, bowling facilities, youth recreation programs, fishing, hunting, boating, snowmobile transits, bike trails, and waterfront access.

[A] Windham's Recreation Athletic youth programs include football and cheerleading, baseball, tennis, lacrosse, basketball, and soccer.

It takes place every year on Thanksgiving morning through the neighborhoods of Windham and raises money for the local Shepherd's Food Pantry.

[23] The Strawberry Festival was moved to Windham High School in 2009 due to the overcrowding at the library in previous years.

In addition to providing emergency services, the department also works closely with community organizations on fire prevention units in the school district, and CPR and first aid classes.