The organized system of Wisconsin State Trunk Highways (typically abbreviated as STH or WIS), the state highway system for the U.S. state of Wisconsin, was created in 1917. The legislation made Wisconsin the first state to have a standard numbering system for its highways. It was designed to connect every county seat and city with over 5000 residents. The original system numbered the roads starting at 11 and ran up to 199. The 1917 law required the creation of a distinctive state route marker, which was initially an inverted triangle. "...it soon became apparent that (the triangle) served no really useful purpose after the public had become educated to the idea of the numbering. The long vertical axis made it necessary to use a lot of space, much of which was useless."^[1] Distinctive route markers were eventually redesigned to use a rounded rectangle for better space usage, but the inverted triangle remains superimposed, as a vestige.^[1]

These routes were altered significantly in 1926 when United States Numbered Highways were commissioned. It was altered to include communities with at least 2,500 residents.^[2] Further alteration occurred when the Interstate Highway System was commissioned in the state.^[3]

Except where indicated, the following highways are or were locally maintained.

More information Number, Length (mi) ...

Number	Length (mi)	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
Bus. WIS 11	2.60	4.18	WIS 11 on the west limits of Monroe	WIS 11 & WIS 69 north of downtown Monroe	01978-01-011978	current
Bus. WIS 13	2.91	4.68	US 10, WIS 13 & CTH-BB south of Marshfield	WIS 13 & WIS 97 in downtown Marshfield	02003-01-012003	current	Follows Central Avenue through Marshfield along the former route's path; state-maintained
Bus. WIS 13	—	—	WIS 13 & WIS 54 in Wisconsin Rapids	WIS 13, WIS 34 & WIS 73 in Wisconsin Rapids	—	—
Bus. WIS 16	3.85	6.20	WIS 16 & WIS 26 on the northern edge of Watertown	WIS 16 & WIS 19 on the eastern edge of Watertown	01978-01-011978	current	Former route of U.S. Route 16 in Wisconsin; was Bus. US 16 1961–1978
Bus. WIS 23	2.40	3.86	WIS 23 southwest of downtown Green Lake	WIS 23 north of downtown Green Lake	01967-01-011967	current
Bus. WIS 23	4.30	6.92	WIS 23 northwest of downtown Plymouth	WIS 23 & WIS 57 northeast of Plymouth	01985-01-011985	current
Bus. WIS 26	5.50	8.85	WIS 26 southwest of Fort Atkinson	WIS 26 north of Fort Atkinson	01995-01-011995	current
Bus. WIS 26	4.40	7.08	WIS 26 near Jefferson	WIS 26 near Jefferson	—	—
Bus. WIS 26	5.40	8.69	WIS 26 near Watertown	WIS 26 near Watertown	—	—
Bus. WIS 26	—	—	WIS 26 east of Fort Atkinson	WIS 26 northeast of Fort Atkinson	—	—
Bus. WIS 29	8.60	13.84	WIS 29 southwest of Chippewa Falls	WIS 29 southeast of downtown Chippewa Falls	02005-01-012005	current
Bus. WIS 29	2.50	4.02	WIS 29 west of Abbotsford	WIS 29 east of Abbotsford	01999-01-011999	current
Bus. WIS 29	6.70	10.78	WIS 29 & CTH-MMM west of Shawano	WIS 29, WIS 47/WIS 55 & CTH-K southeast of downtown Shawano	01998-01-011998	current	Follows part of former alignment through Shawano before joining WIS 47/WIS 55 to return to the main route
Bus. WIS 29	2.80	4.51	US 45, WIS 29 & CTH-M on the north side of Wittenberg	US 45, WIS 29 & CTH-Q east of Wittenberg	01999-01-011999	current	Follows former alignment of US 45 through Wittenberg; co-signed as CTH-Q
Bus. WIS 35	4.10	6.60	US 53, WIS 35 & CTH-HD south of Holmen	US 53/WIS 93, WIS 35 & CTH-HD northwest of Holmen	—	—
Bus. WIS 40	0.80	1.29	US 8 & WIS 40 in downtown Bruce	WIS 40 northwest of downtown Bruce	01999-01-011999	current
Bus. WIS 42	4.50	7.24	US 151 east of I-43 along Calumet Avenue	US 10/WIS 42 at Waldo Boulevard	01980-01-011980	02022-01-012022	Followed older alignment through Manitowoc
Bus. WIS 42	—	—	—	—	01980-01-011980	01993-01-011993	Served Sheboygan
Bus. WIS 42	3.55	5.71	WIS 42/WIS 57 along Green Bay Road	WIS 42/WIS 57 along Egg Harbor Road	01977-01-011977	current	Follows former alignment through Sturgeon Bay, cosigned with Bus. WIS 57
Spur WIS 42	0.08	0.13	WIS 42 in Gills Rock	Island Clipper ferry dock in Gills Rock	—	—	Unsigned; state-maintained
Bus. WIS 57	3.55	5.71	WIS 42/WIS 57 along Green Bay Road	WIS 42/WIS 57 along Egg Harbor Road	—	—	Follows former alignment through Sturgeon Bay, cosigned with Bus. WIS 42
Bus. WIS 64	3.9	6.3	—	—	—	—
Bus. WIS 64	2.7	4.3	—	—	—	—
Spur WIS 794	0.30	0.48	WIS 794 in St. Francis	WIS 32 in St. Francis	—	—	Unsigned on Howard Avenue; state-maintained
Former

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