Brentwood is a hamlet in the Town of Islip in Suffolk County, New York, United States. As of the 2010 Census, the population of Brentwood was 60,664.
In 1844, the area was established as Thompson Station and Suffolk Station, two new stations on the expansion of the mainline of the Long Island Rail Road.
On March 21, 1851, it became the utopian community named Modern Times. The colony was established on 750 acres (3.0 km2) of land by Josiah Warren and Stephen Pearl Andrews. In 1864, it was renamed Brentwood after the town of Brentwood, Essex, in England.
By contract, all the land in the colony was bought and sold at cost, with 3 acres (12,000 m2) being the maximum allowable lot size. The community was said to be based on the idea of individual sovereignty and individual responsibility. Individuals were encouraged to pursue their self-interest as they saw fit. All products of labor were considered private property. The community had a local private currency based upon labor exchange in order to trade goods and services (see Mutualism (economic theory)). All land was private property, with the exception of alleys which were initially considered common property but later converted to private property.