In July 2005, CNN/Money and Money magazine ranked Larchmont 11th on its list of the 100 Best Places to Live in the United States. Originally inhabited by the Siwanoy (an Algonquian tribe), Larchmont was discovered by the Dutch in 1614. By 1720, few Siwanoy remained in the Larchmont area and the land had been largely bought up by British and Dutch settlers.
Larchmont's oldest and most historic home, the "Manor House" on Elm Avenue, was built in 1797 by Peter Jay Munro. Munro was the nephew of John Jay, the first Chief Justice of the United States Supreme Court, and was later adopted by Jay. At the beginning of the 19th Century, Munro was active in the Abolitionist movement, helping to found the NY State Manumission Society, along with his uncle and Alexander Hamilton. Munro's house faced towards the Boston Post Road (the back is now used as the front), which tended to generate a lot of dust in summer months. To combat this, his gardener imported a Scottish species of larch trees that were known to be fast growing. These were planted along the front of the property, eventually giving the village its name. The Village of Larchmont was incorporated in 1891.
Before the advent of the automobile, Larchmont was a resort community serving wealthy New York City residents. Many of the Victorian "cottages" and a few of the grand hotels (such as the Bevan House and Manor Inn) remain to this day, though these have been converted to other uses such as private residences. The Larchmont Yacht Club hosts an annual Race Week competition (2007 marked the 110th running of this event). It is adjacent to Manor Park, which was designed by Jeremiah Towle, an early summer resident of Larchmont Manor and an engineer. The Larchmont Shore Club (near the Larchmont Yacht Club) hosts an annual 'Swim Across America' challenge, across Long Island Sound.
According to the United States Census Bureau, the village has a total area of 1.1 square miles (2.8 km2), all of it land.
A source of confusion for non-locals is that large portion of the area served by the Larchmont Post Office (zip code 10538) is actually not in the Incorporated Village of Larchmont, but is part of the "unincorporated area" of the Town of Mamaroneck.
There were 2,418 households out of which 38.8% had children under the age of 18 living with them, 62.6% were married couples living together, 6.3% had a female householder with no husband present, and 29.3% were non-families. 25.8% of all households were made up of individuals and 10.9% had someone living alone who was 65 years of age or older. The average household size was 2.66 and the average family size was 3.25.
In the village the population was spread out with 29.3% under the age of 18, 3.9% from 18 to 24, 30.1% from 25 to 44, 23.7% from 45 to 64, and 12.9% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 90.7 males. For every 100 females age 18 and over, there were 85.5 males.
According to a 2009 estimate the median income for a household in the village was $165,375, and the median income for a family was $204,695. The per capita income for the village was $109,664. About 1.6% of families and 2.3% of the population were below the poverty line, including 1.5% of those under age 18 and 5.1% of those age 65 or over.