Long Island isn’t a New York City borough because only its western half ever joined the city. When the five boroughs consolidated in 1898, the rural eastern towns of what was then Queens County refused to come along, and a year later they split off to form Nassau County. Suffolk County, farther east, was never part of the conversation. That 1898 boundary has held for more than a century, which is why Nassau and Suffolk, the two counties people mean when they say “Long Island,” sit outside New York City even though they share the same landmass as Brooklyn and Queens.
What People Mean by “Long Island”
Geographically, Long Island is a single 118-mile island made up of four counties: Kings (Brooklyn), Queens, Nassau, and Suffolk. Brooklyn and Queens have been New York City boroughs since 1898. In everyday speech, though, “Long Island” refers only to Nassau and Suffolk, the two counties that are not part of the city. The dividing line runs between Queens and Nassau, and it is one of the sharpest identity borders in the metro area. A resident of Bellerose, Queens, and a resident of Floral Park, Nassau, can live a few blocks apart under entirely different governments, tax structures, and school systems.
The 1898 Consolidation and Where It Stopped
On January 1, 1898, Manhattan, Brooklyn, the Bronx, Queens, and Staten Island merged into the City of Greater New York.1NYC Archaeological Repository. Consolidation of the Five-Borough City The goal was a unified metropolis that could rival London, with shared water, coordinated port management, and the political weight of millions of people under one government.
The merger was not universally welcomed. A nonbinding 1894 referendum showed uneven support, with Kings County approving by only 50.1% and several towns in Queens voting against.2New York Genealogical & Biographical Society. Before the Five-Borough City: The Old Cities, Towns, and Villages That Came Together to Form Greater New York The state legislature approved it anyway. The new city absorbed the former City of Brooklyn, the western portion of Queens County, all of Richmond County (Staten Island), and parts of Westchester that became the Bronx. Each borough was made coextensive with a county.3nyc.gov. Understanding Local Government in NYC
The key detail is in the words “western portion.” The city stopped at what is now the Queens-Nassau line. Everything east of it was left out.
Why the Eastern Towns Stayed Out
Three large eastern towns of Queens County, Hempstead, North Hempstead, and Oyster Bay, were not included in the new city.2New York Genealogical & Biographical Society. Before the Five-Borough City: The Old Cities, Towns, and Villages That Came Together to Form Greater New York They were largely rural, and their residents had little interest in being absorbed into an urban government that would bring higher taxes and regulations built for dense city neighborhoods. The cultural gap between western Queens, already urbanizing, and the farmland to the east was enormous.
Sitting inside a truncated Queens County made no administrative sense once the western half had been pulled into the city. The state legislature approved a separation, and on January 1, 1899, the three eastern towns became the new county of Nassau.4Patchogue-Medford Library. Long Island – Town Histories and Records Suffolk County, covering the eastern half of the island, was never seriously considered for inclusion. It was too far away and too sparsely populated to have any practical tie to the consolidation effort.
Why the Split Has Lasted
Once Nassau and Suffolk were out, the practical reasons to stay out only grew. Each county runs its own full government, with elected county executives, legislatures, and departments handling police, public works, health services, and parks. Nassau is made up of three towns, Hempstead, North Hempstead, and Oyster Bay, plus two cities, Glen Cove and Long Beach.4Patchogue-Medford Library. Long Island – Town Histories and Records Suffolk contains ten towns stretching from Babylon to Montauk. Within those towns, dozens of incorporated villages run their own governments, and some maintain their own police forces alongside the county police. That kind of fragmentation would be unthinkable inside New York City, where the NYPD covers all five boroughs under a single command.
New York’s Municipal Home Rule Law gives these local governments substantial power over their own property, zoning, parks, and local laws, and those powers carry quasi-constitutional protection that the state legislature cannot easily strip away.5NY.Gov. Local Government Home Rule Power Local control over zoning, policing, and land use is something Long Island residents and officials guard closely.
Taxes reinforce the divide. New York City residents pay a city income tax on top of state and federal taxes; Long Islanders who commute into the city for work do not. In the other direction, Long Island’s property taxes are among the highest in the country. New York State data puts Nassau County’s overall full-value tax rate at roughly $36.90 per $1,000 of assessed value and Suffolk County’s around $18.90, compared with New York City’s Class 1 residential rate of about $7.53.6Tax.NY.Gov. Overall Full-Value Tax Rates by County (All Taxing Purposes): 2012-2021 The high property taxes largely fund dozens of independent school districts, each with its own budget, board, and taxing authority voted on directly by residents. New York City funds its schools through the city budget under a single Department of Education.
Those differences cut both ways, and that is the point. The two sides of the Queens-Nassau line now have governing systems built for completely different places.
Could Long Island Ever Become Part of New York City?
No serious political movement has come close. The idea surfaces in opinion columns and thought experiments, but it faces heavy practical and political obstacles. Any merger would require state legislative action, and Long Island’s representatives would answer to constituents who moved to Nassau or Suffolk precisely to be outside the city’s tax structure and governance model. Home rule protections would make dismantling the existing county, town, village, and school district structures legally difficult on top of being politically toxic.
The identity piece runs just as deep. Long Islanders define themselves in contrast to the city, and that distinction has hardened over the past century. Property owners already paying some of the highest taxes in the country would not welcome a city income tax on top. Parents invested in their local school districts would resist folding into a centralized citywide system. Police departments, fire districts, water authorities, and zoning boards would all face dissolution or reorganization. The political will for that kind of upheaval does not exist on either side of the border, which is why the line drawn in 1898 still defines what counts as a New York City borough and what counts as Long Island.