646 Area Code: New York City, New York

The 646 area code is one of several area codes serving New York City, layered onto Manhattan in particular alongside the long-running 212 and the more recent 332. The 646 designation has been filling with allocations since the late 1990s, when Manhattan's number demand began outpacing what 212 alone could support. The borough itself sits on the long narrow island bounded by the Hudson, East, and Harlem rivers, organized around the famously dense grid that climbs from the financial district at the southern tip through Midtown's office towers and into Upper Manhattan.

Records linked to 646 numbers in the directory often include other New York cities — Albany, Binghamton, Brentwood, and Buffalo among them. None of those are inside the 646 footprint. The pattern reflects standard public-record dynamics, with phone numbers porting across New York and addresses linked across multiple cities. The directory currently documents 607 distinct prefixes within 646 in detail, a working subset of the prefix population the code carries.

New York City's population dominates the demographic story: the city sits among the largest in the world, with the metropolitan area many times its city-level size. Home values in the city run several times the US median, household income comes in slightly above the national reading citywide (with sharp variation by borough and neighborhood), and the median age sits close to the US figure. The 646 footprint shares those demographics with 212 and 332 because all three codes serve Manhattan in overlapping form.