Indiana State Road 18

State Road 18
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Route information
Maintained by INDOT
Length:	141.13 mi (227.13 km)
Major junctions
West end:	Illinois state line west of Fowler
	US 41 US 52 / SR 55 in Fowler US 231 I-65 US 421 / SR 39 through Delphi US 35 at Galveston US 31 east of Galveston I-69
East end:	US 27 / SR 67 at Bryant
Location
Counties:	Benton, White, Carroll, Cass, Miami, Grant, Blackford, Jay
Highway system
Indiana State Roads Interstate US State Former ← SR 17 SR 19 →

State Road 18 (SR 18) in the U.S. State of Indiana is an east–west route in North Central Indiana running from the Illinois border in Benton County almost to the Ohio border, terminating at U.S. Route 27 (US 27)/State Road 67 (SR 67) in Jay County. State Route 18 is mainly a 2 lane road with exception of 4 lane divided highway from Marion to Interstate 69 (I-69). Marion is the only considerably large city that Route 18 passes through. State Route 18 runs just south of the lakes region, with Lake Shafer, Lake Freeman, Mississinewa Reservoir, and Salamonie Reservoir not too far to the north. With the exception of Marion, Route 18 passes through mostly small towns. The terrain is mostly level and is utilized mostly for agriculture.

Route description

SR 18 heads east from the western terminus at the Illinois State line. Then SR 18 has an intersection with State Road 71. SR 18 heads east having an intersection with U.S. Route 41. Then SR 18 heads east towards Fowler, when in Fowler SR 18 begins a concurrency with U.S. Route 52 and State Road 55. All three routes head southeast, until SR 18 turns due east. SR 18 heads east towards Brookston, passing through an intersection with U.S. Route 231 and an interchange with Interstate 65 (I-65). In Brookston SR 18 has a concurrency with State Road 43. From Brookston SR 18 heads east towards Pittsburg, just west of Pittsburg SR 18, begins a concurrency with U.S. Route 421, and State Road 39. All three route heads southeast towards Delphi, west of downtown Delphi State Road 25 joins the concurrency. Then all four routes turn northeast towards downtown Delphi. When in downtown Delphi SR 25 leaves the concurrency on a northeast route as US 421/SR 18/SR 39 turn southeast. South of Delphi SR 18 leaves the concurrency with US 421 and SR 39. SR 18 heads due east towards Flora where SR 18 has an intersection with State Road 75. SR 18 heads east towards Galveston passing through a concurrency with State Road 29. In Galveston SR 18 has an intersection with U.S. Route 35. Then just east of Galveston SR 18 has an intersection with U.S. Route 31.

From US 31, SR 18 heads east towards Converse passing through a concurrency with State Road 19. SR 18 then heads through Converse, after Converse SR 18 has a concurrency with State Road 13. SR 18 turns southeast towards Marion passing through Sweetser. In Marion eastbound SR 18 is on a Fourth Street and westbound SR 18 is on Third Street and Second Street. East of Marion the one-way streets become a four-lane highway. SR 18 heads east towards Montpelier passing through an interchange with I-69 and passing through an intersection with State Road 5 and State Road 3. East of Montpelier SR 18 passes through an intersection with State Road 1. Then SR 18 heads east towards its eastern terminus near Bryant at an intersection with US 27 and SR 67, from this intersection SR 67 heads east towards Ohio.

Major intersections

County	Location	mi	km	Destinations	Notes
Benton	Parish Grove Township	0.00	0.00	Iroquois County Road 880 North	Illinois State Line
		1.94	3.12	SR 71
		7.72	12.42	US 41 – Terre Haute, Hammond
	Fowler	10.93	17.59	US 52 west / SR 55 north – Kentland, Crown Point	Western end of US 52 and SR 55 concurrences
		12.15	19.55	US 52 east / SR 55 south – Indianapolis, Attica	Eastern end of US 52 and SR 55 concurrences
White	Round Grove Township	26.65	42.89	US 231 – Lafayette, Crown Point
		29.36	47.25	I-65 – Indianapolis, Gary
	Brookston	35.16	56.58	SR 43 north – Reynolds	Northern end of SR 43 concurrency
		35.34	56.87	SR 43 south – Lafayette	Eastern end of SR 43 concurrency
Carroll	Tippecanoe Township	42.66	68.65	US 421 north / SR 39 north – Michigan City, La Porte	Western end of US 421 and SR 39 concurrences
	Delphi			SR 25 south – Lafayette	Western end of SR 25 concurrency
				SR 25 north – Logansport	Eastern end of SR 25 concurrency
	Deer Creek Township	48.97	78.81	US 421 south / SR 39 – Frankfort, Indianapolis	Eastern end of US 421 and SR 39 concurrences
	Flora	54.99	88.50	SR 75
	Carrollton Township	62.23	100.15	SR 29 south	Southern end of SR 29 concurrency
		63.74	102.58	SR 29 north – Logansport	Northern end of SR 29 concurrency
Cass	Galveston	74.76	120.31	US 35 – Kokomo, Logansport
Miami	Deer Creek Township	78.24	125.92	US 31
	Jackson Township	89.16	143.49	SR 19 north – Elkhart	Western end of SR 19 concurrency
				SR 19 south – Noblesville	Eastern end of SR 19 concurrency
Grant	Converse	94.71	152.42	SR 13 south – Elwood	Southern end of SR 13 concurrency
		95.02	152.92	SR 13 north – Wabash	Northern end of SR 13 concurrency
	Marion	103.15	166.00	SR 9 / SR 15 – Anderson, Gas City, Huntington, Wabash
		109.84	176.77	I-69 – Indianapolis, Fort Wayne
	Monroe Township	112.32	180.76	SR 5 – Upland, Warren
Blackford	Washington Township	119.33	192.04	SR 3 – Hartford City, Markle
Jay	Montpelier	131.06	210.92	SR 1 – Cambridge, Fort Wayne
	Bryant	141.13	227.13	US 27 / SR 67 – Portland, Decatur, Celina	Eastern terminus of SR 18
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus