U.S. Route 20

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	US 20 highlighted in red
Route information
Length	3,365 mi (5,415 km)
Existed	November 11, 1926–present
Major junctions
West end	Lua error in Module:Jct at line 204: attempt to concatenate local 'link' (a boolean value). in Newport, OR
	Lua error in Module:Jct at line 204: attempt to concatenate local 'link' (a boolean value). at Albany, OR; Lua error in Module:Jct at line 204: attempt to concatenate local 'link' (a boolean value). at Idaho Falls, ID; Lua error in Module:Jct at line 204: attempt to concatenate local 'link' (a boolean value). at Casper, WY; Lua error in Module:Jct at line 204: attempt to concatenate local 'link' (a boolean value). near Williams, IA; Lua error in Module:Jct at line 204: attempt to concatenate local 'link' (a boolean value). at Hodgkins, IL; Lua error in Module:Jct at line 204: attempt to concatenate local 'link' (a boolean value). in Gary, IN; Lua error in Module:Jct at line 204: attempt to concatenate local 'link' (a boolean value). in Perrysburg, OH; Lua error in Module:Jct at line 204: attempt to concatenate local 'link' (a boolean value). near Erie, PA; Lua error in Module:Jct at line 204: attempt to concatenate local 'link' (a boolean value). near Albany, NY; Lua error in Module:Jct at line 204: attempt to concatenate local 'link' (a boolean value). in Waltham, MA;
East end	Lua error in Module:Jct at line 204: attempt to concatenate local 'link' (a boolean value). in Boston, MA
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Highway system
	United States Numbered Highway System; List; Special; Divided;

U.S. Route 20 or U.S. Highway 20 (US 20) is an east–west United States highway that goes from Newport, Oregon to Boston, Massachusetts. The highway is 3,365 miles (5,415 km) long. It is the longest road in the United States.^[2]

There is a gap in the official signage of US 20 through Yellowstone National Park. The park uses unnumbered roads.

U.S. Route 20 Media

Sign at western origin in Newport, Oregon
US 20 enters Nebraska from Wyoming
US 20 crosses the Mississippi River connecting Dubuque, Iowa, and East Dubuque, Illinois
Looking eastbound at US 20 as it meets State Road 127 in a traffic circle in Angola, Indiana
Sign for US 20 along with the sign for State Route 7 in Conneaut, Ohio
I-79 at US 20 (exit 182) in Erie, Pennsylvania
US 20 marker, east of Sangerfield, New York
Sign for Route 20 at Kenmore Square, near the Boston Citgo sign
New England Interstate Route shield. Uses the US Highway Old Style font.

References

↑ United States Geological Survey. United States System of Highways Adopted for Uniform Marking by the American Association of State Highway Officials [map], 1:7,000,000.
↑ ^2.0 ^2.1 Weingroff, Richard (October 17, 2013). "Ask the Rambler: What Is The Longest Road in the United States?". Federal Highway Administration.

		Main U.S. Routes
	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
20	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36	37	38
40	41	42	43	44	45	46		48	49	50	51	52	53	54	55	56	57	58	59
60	61	62	63	64	65	66	67	68	69	70	71	72	73	74	75	76	77	78	79
80	81	82	83	84	85		87		89	90	91	92	93	94	95	96	97	98	99
101		163						400				412				425
Lists		U.S. Routes - Bannered - Divided - Bypassed

[USHM-1] United States Geological Survey. United States System of Highways Adopted for Uniform Marking by the American Association of State Highway Officials [map], 1:7,000,000.

[fhwa-2] 2.0 ^2.1 Weingroff, Richard (October 17, 2013). "Ask the Rambler: What Is The Longest Road in the United States?". Federal Highway Administration.

[2]

[1]