Nassau County, NY

Settlement & growth (pre-1960)

Before European contact, the area now known as Nassau County was inhabited by the Lenape people, specifically the bands of the Matinecock, Rockaway, and Merrick tribes, who lived in seasonal villages along the coast and inland waterways. Dutch colonists from New Netherland began settling western Long Island in the 1630s and 1640s, founding towns like Hempstead (1644) and Flushing (1645, now in Queens) under the patroon system. The English took control in 1664, and the region became part of the Province of New York, with English settlers establishing farming communities such as Oyster Bay (1653) and Huntington (1653, now in Suffolk County).

After the American Revolution, Nassau County remained largely rural and agricultural through the 19th century, with small villages like Glen Cove and Roslyn serving as market towns. The arrival of the Long Island Rail Road in the 1830s and 1840s began to transform the area, enabling wealthy New York City families to build summer estates in communities like Old Westbury and Locust Valley. The first major wave of suburbanization came in the 1890s through the 1920s, as German, Irish, and Italian immigrants—many of them second- and third-generation New Yorkers—moved east from Brooklyn and Queens. They settled in developing villages such as Mineola, Hicksville, and Levittown (the latter famously built after World War II). These groups worked in construction, manufacturing, and the growing service economy of New York City.

The post-World War II boom was transformative. Levittown, built between 1947 and 1951, became the archetypal American suburb, attracting hundreds of thousands of white, middle-class families—mostly of German, Irish, Italian, and Eastern European Jewish descent—who left New York City for affordable single-family homes. This period cemented Nassau County’s reputation as a white, suburban, Republican-leaning stronghold. By 1960, the county’s population had exploded to over 1.3 million, and its character was defined by sprawling subdivisions, shopping centers, and a car-dependent lifestyle.

Modern era (post-1965)

The 1965 Hart-Cellar Immigration Act fundamentally reshaped Nassau County’s demographics, though the effects were slower to arrive than in New York City proper. The first post-1965 wave brought East/Southeast Asian immigrants—primarily Chinese, Korean, and Filipino professionals—who settled in communities with strong school systems and existing ethnic infrastructure. Great Neck and Manhasset became magnets for Chinese and Korean families, drawn by top-ranked public schools and proximity to Manhattan. Jericho and Syosset followed a similar pattern, with East/Southeast Asian populations now exceeding 20% in some school districts.

Indian-subcontinent immigration accelerated in the 1990s and 2000s, driven by the tech boom and H-1B visa programs. Hicksville emerged as a major Indian enclave, with a dense concentration of Indian restaurants, grocery stores, and cultural institutions along Old Country Road. Plainview and Bethpage also saw significant Indian-subcontinent settlement, attracted by affordable housing and good schools. Today, the Indian-subcontinent population of 5.2% is one of the fastest-growing segments in the county.

Hispanic growth has been steady since the 1980s, driven by immigration from Central America (particularly El Salvador and Guatemala) and Puerto Rico. Hempstead village and Freeport have become the primary Hispanic hubs, with vibrant bodegas, churches, and community organizations. The Hispanic population of 18.5% is now the largest minority group, and it is younger on average than the white population, driving much of the county’s population stability. The Black population (10.9%) is concentrated in Hempstead, Uniondale, and Roosevelt, communities that have historically been home to African American families since the Great Migration of the 1940s and 1950s.

Domestic migration has been a countervailing force. Since the 1990s, Nassau County has experienced net out-migration of white, non-Hispanic residents to the Sun Belt, Florida, and the Carolinas, as well as to less expensive parts of New York State. This outflow has been partially offset by international immigration, which keeps the population relatively stable. The county’s foreign-born share is 6.9%, lower than New York City’s 36% but significant for a suburban county.