Is Long Island Part of New York?

Yes. Long Island is a 118-mile-long island in southeastern New York State, comprising four counties:

1. Kings (Brooklyn) — 2.7M
2. Queens — 2.4M
3. Nassau — 1.4M
4. Suffolk — 1.5M

Total population: ~8 million (2023) — most populous island in US, 18th globally.

Geographic & Political Notes

• Brooklyn & Queens are NYC boroughs (on the island's western end).
• Nassau & Suffolk are suburban counties ("Long Island" in colloquial use often means these two).
• Bounded: Long Island Sound (north), Atlantic (south), East River (west), Block Island Sound (east).
• Not part of NY: Fishers Island (NY politically, but geographically part of RI archipelago); Staten Island (NYC borough, separate island).