Interstate 81

Northbound I-81 reassuance shield near Preble. (Mark Sinsabaugh, 04/02/2007)

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Southern Terminus:	PA Line at Conklin
Northern Terminus:	US-Canada Border at Wellesley Island (Continues as ON 137)
Length:	183.42 miles (295.31 km)
Orientation:	North-South
Counties:	Broome, Cortland, Onondaga, Oswego, Jefferson
Cities:	Binghamton, Cortland, Syracuse, Watertown
Villages:	Whitney Point, Marathon, Homer, North Syracuse, Parish, Pulaski, Sandy Creek, Adams
Towns:	Kirkwood, Dickinson, Chenango, Barker, Triangle, Lisle, Marathon, Lapeer, Virgil, Cortlandville, Homer, Preble, Tully, Lafayette, Onondaga, Salina, Clay, Cicero, Parish, Mexico, Richland, Sandy Creek, Ellisburg, Adams, Hounsfield, Watertown, Pamelia, Orleans, Alexandria
Name(s):	American Legion Memorial Highway
History:	Construction began in 1954, with the last sections opening in 1971. Sometime in 2025, the segment of I-81 between Exits 16A and 29 will be relocated to the current I-481 alignment as the elevated section of I-81 in downtown Syracuse is expected to be demolished and replaced with a grade level boulevard. Construction began in 2023 with reconstruction of the two interchanges with I-481 north and south of Syracuse. The project as a whole is expected to be completed by 2028. The process to convert I-81's exit numbering scheme from sequential to mileage based began in 2023 with the exits in NYSDOT Region 3 (Cortland, Onondaga, and Oswego Counties) along sections that will not be relocated. Exit numbers in Broome County made the switch in early 2025. Exit numbers north of Syracuse reflect the new mileage once the Syracuse section of I-81 is relocated to I-481.

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Mile	Desc.	NORTH (Read Down)	SOUTH (Read Up)
.	.
0.00	JCT (ST)
		(Mark Sinsabaugh, 08/26/2018)	(Mark Sinsabaugh, 04/11/2025)
3.98
		(Mark Sinsabaugh, 04/15/2023)	(Mark Sinsabaugh, 04/11/2025)
8.47
		(Mark Sinsabaugh, 04/17/2025)	(Mark Sinsabaugh, 04/21/2018)
.	MP		.
8.72		.
		.	(Mark Sinsabaugh, 04/11/2025)
12.01			.
		(Mark Sinsabaugh, 04/17/2025)	.
12.40
		(Mark Sinsabaugh, 04/15/2023)	(Mark Sinsabaugh, 04/11/2025)
.	MP	.
12.88
		(Mark Sinsabaugh, 04/17/2025)	(Mark Sinsabaugh, 04/11/2025)
13.54
		(Mark Sinsabaugh, 04/17/2025)	(Mark Sinsabaugh, 04/11/2025)
14.77		(WT)	.
		(Mark Sinsabaugh, 09/16/2005)	.
15.66			.
		(Mark Sinsabaugh, 04/17/2025)	.
16.42		.
		.	(Mark Sinsabaugh, 04/11/2025)
21.52
		(Mark Sinsabaugh, 04/17/2025)	(Mark Sinsabaugh, 04/11/2025)
28.83			.
		(Mark Sinsabaugh, 04/17/2025)	.
30.23		.
		.	(Mark Sinsabaugh, 04/11/2025)
35.68	.
		(Mark Sinsabaugh, 04/17/2025)	(Mark Sinsabaugh, 03/21/2015)
38.17
		(Douglas Kerr, 11/04/2009)
39.90
			(Mark Sinsabaugh, 04/11/2025)
49.90
		(Mark Sinsabaugh, 04/17/2025)	(Mark Sinsabaugh, 04/11/2025)
52.27
		(Mark Sinsabaugh, 04/17/2025)	(Mark Sinsabaugh, 04/11/2025)
53.94
		(Mark Sinsabaugh, 04/17/2025)	(Mark Sinsabaugh, 04/11/2025)
62.75
		(Mark Sinsabaugh, 04/17/2025)	(Mark Sinsabaugh, 04/11/2025)
65.04	.
		(Mark Sinsabaugh, 04/02/2007)	(Mark Sinsabaugh, 05/31/2009)
66.51
		(Mark Sinsabaugh, 04/17/2025)	(Mark Sinsabaugh, 04/21/2018)
73.13
		(Mark Sinsabaugh, 04/17/2025)	(Mark Sinsabaugh, 04/11/2025)
78.04
		(Mark Sinsabaugh, 04/17/2025)	(Mark Sinsabaugh, 04/21/2018)
81.37		(ST)
		(Mark Sinsabaugh, 04/02/2007)	(Mark Sinsabaugh, 05/03/2008)
82.35
		.	(Mark Sinsabaugh, 05/03/2008)
83.77
		(Mark Sinsabaugh, 12/11/2009)	(Mark Sinsabaugh, 05/03/2008)
84.43		(Exit 12)	(Exit 12)
		(Mark Sinsabaugh, 12/11/2009)	(Mark Sinsabaugh, 03/26/2022)
84.74		.
		.	(Mark Sinsabaugh, 08/03/2008)
84.83		.
		.	(Mark Sinsabaugh, 03/26/2022)
85.28		.
		.	(Mark Sinsabaugh, 03/26/2022)
85.31			.
		(Mark Sinsabaugh, 04/13/2008)	.
86.39
		(Mark Sinsabaugh, 04/13/2008)	(Mark Sinsabaugh, 03/02/2019)
87.78
		(Mark Sinsabaugh, 05/15/2009)	(Mark Sinsabaugh, 05/03/2008)
88.18		(Exit 36)
		(Douglas Kerr, 11/28/2008)	(Mark Sinsabaugh, 08/03/2008)
89.67			.
		(Mark Sinsabaugh, 08/03/2008)	.
90.33
		(Douglas Kerr, 12/12/2009)	(Mark Sinsabaugh, 06/28/2009)
91.16		.
		.	(Mark Sinsabaugh, 06/28/2009)
92.54		(NT, Exit 9) / (ST, Exit 9)
		(Douglas Kerr, 12/12/2009)	(Mark Sinsabaugh, 06/28/2009)
95.03
		(Mark Sinsabaugh, 03/02/2019)	(Mark Sinsabaugh, 06/28/2009)
98.96
		(Douglas Kerr, 09/10/2009)	(Mark Sinsabaugh, 06/28/2009)
99.15
102.78
		(Douglas Kerr, 09/10/2009)	.
111.08
		(Douglas Kerr, 09/10/2009)	.
114.72
		(Douglas Kerr, 07/23/2004)	.
118.15
121.56			.
122.34		.
		.	(Mark Sinsabaugh, 10/09/2020)
128.15
		.	(Mark Sinsabaugh, 10/09/2020)
129.98	.
		.	(Mark Sinsabaugh, 05/20/2009)
130.68
		.	(Mark Sinsabaugh, 05/20/2009)
132.71
		.	(Mark Sinsabaugh, 05/20/2009)
134.59
		(Douglas Kerr, 03/21/2009)	(Mark Sinsabaugh, 05/20/2009)
140.15
		(Douglas Kerr, 03/21/2009)	(Mark Sinsabaugh, 05/20/2009)
144.28		(ET)
		(Douglas Kerr, 03/21/2009)	.
145.83
		(Douglas Kerr, 03/21/2009)	.
148.19
		(Mark Sinsabaugh, 04/22/2018)	.
152.50
		.	(Douglas Kerr, 08/23/2008)
153.47
		.	(Douglas Kerr, 04/01/2007)
154.95
		(Douglas Kerr, 07/23/2004)	(Douglas Kerr, 04/01/2007)
157.57
		.	(Douglas Kerr, 04/01/2007)
158.00		(WT)
		(George Bourey, 06/28/2020)	(George Bourey, 06/28/2020)
169.07
		(Mark Sinsabaugh, 09/10/2011)	(Douglas Kerr, 04/01/2007)
178.04
		(Douglas Kerr, 04/24/2003)	(Douglas Kerr, 04/01/2007)
.	.		.
179.70
		(Douglas Kerr, 00/00/0000)	(Douglas Kerr, 04/01/2007)
182.93
		(Douglas Kerr, 00/00/0000)	.
183.42	.	Customs - Border Patrol STOP FOR INSPECTION
.	.	EXPRESSWAY ENDS
183.42	JCT (NT)	TO
.	.

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AARoads Interstate Guide: I-81 (Alex Nitzman and Andy Field) Alps Roads (Steve Alpert) East Coast Roads (David Golub) New York State Roads (Valerie Deane) Thousand Islands Bridge Authority Wikipedia: Interstate 81

Page Created: October 3, 2006 | Page Updated: April 19, 2025