Interstate 684
highway in New York and Connecticut
Interstate 684 (I-684) is a 28.53-mile (45.91 km) auxiliary Interstate Highway in the state of New York in the United States. There is also a short portion in Connecticut with no junctions. The highway connects I-84 with I-287 and the Hutchinson River Parkway, primarily serving commuter traffic to and from the northern suburbs of the New York metropolitan area. Most of the route is in northern Westchester County. The route of the highway was originally designated as part of I-87 from 1968 to 1970. The first section of the roadway opened to traffic in October 1968, and the final segment was completed in December 1974.
Route description
Cross Westchester Expressway to Saw Mill River Parkway
Northward, I-684 begins as two separate spur routes. The primary spur, which is officially designated I-684, begins at the White Plains–Harrison line at exit 9A of the Cross Westchester Expressway (I-287) in Westchester County, New York. The other, officially designated as New York State Route 984J (NY 984J) but signed as I-684 in the northbound direction, begins in Harrison north of exit 16A (formerly exit 26) on the Hutchinson River Parkway. NY 984J has one independent exit with Manhattanville Road, which serves Manhattanville College, before joining the spur to I-287.
The public source identifies “Interstate 684” as highway in New York and Connecticut. This brief keeps that definition visible, then builds a research path around Interstate, highway and York.
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Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Mar 25, 2026. The linked authority identifier is Q2263203. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1968, 1970 and 1974.
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This entry incorporates text from “Interstate 684” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.