State Route 73
Route information
Maintained by ODOT
Length	134.80 mi[1] (216.94 km)
Existed	1924–present
Major junctions
West end	US 27 in Oxford
Major intersections	US 127 in Collinsville I-75 in Franklin US 42 in Waynesville I-71 near Wilmington US 68 in Wilmington US 22 / SR 3 in Wilmington US 50 / US 62 / SR 124 / SR 138 in Hillsboro US 52 near Portsmouth
East end	US 23 / SR 104 in Portsmouth
Location
Country	United States
State	Ohio
Counties	Butler, Warren, Clinton, Highland, Adams, Scioto
Highway system
Ohio State Highway System Interstate US State Scenic
← I-73 → I-74

State Route 73 (SR 73) is an east–west state highway in the southern portion of the U.S. state of Ohio. Its western terminus is on U.S. Route 27 in Oxford at the intersection of SR 732. SR 73’s eastern terminus is in Portsmouth at US 23; this is also the southern terminus of SR 104, and the two state routes run concurrently for over 6 miles (9.7 km) from this point north. Once SR 73 enters Scioto County, it is designated as the Scenic Scioto Heritage Trail by the Ohio Department of Transportation.^[2]

In combination with SR 32, SR 73's easternmost 31 miles (50 km) are part of the quickest route between Cincinnati and Portsmouth.

The portion of SR 73 between Interstate 75 and SR 741 in Springboro is designated as the "Officer Bill Johnson Memorial Highway",^[3] in honor of William L. "Bill" Johnson, a 48-year-old, eight-year veteran of the Springboro Police Department who was struck and killed by a vehicle around 12:30 a.m. on June 27, 1983 while outside his cruiser on SR 73, investigating two people walking in the roadway.^[4]

• Great Miami River - Middletown, Franklin
• Excello Locks - Historic Remains of a lock on the Miami-Erie Canal near the intersection of 73 and S. Main St. in Middletown, Ohio. Much of the route between Trenton and Franklin follows the original path of the Miami and Erie Canal.
• Middletown Historical Society Canal Museum
• La Comedia Dinner Theatre - Springboro
• Little Miami River - Waynesville
• Little Miami Bike Trail - Corwin
• Caesar Creek Lake - Warren County
• Caesar Creek State Park - Warren, Clinton County
• Serpent Mound
• Brush Creek State Forest
• Shawnee State Forest
• Scioto River
• Ohio River

This article is in list format but may read better as prose. You can help by converting this article, if appropriate. Editing help is available. (February 2020)

• 1924 – Original route established;^[5] originally routed from Franklin to 1-mile (1.6 km) west of Portsmouth (dually certified with State Route 104 from 1-mile (1.6 km) north of Coles Park to 1-mile (1.6 km) west of Portsmouth before 1926).^[6]
• 1926 – Extended to 2 miles (3.2 km) east of Middletown along the previous State Route 6; State Route 104 certification removed.^[6]
• March 9, 1932 – Extended to the U.S. Route 127 about 1-mile (1.6 km) northwest of Seven Mile.^[7]
• 1936 – Extended to Oxford.^[6]
• 1952 – Dually certified with State Route 104 from 1-mile (1.6 km) north of Coles Park to 1-mile (1.6 km) west of Portsmouth.^[6]
• 1957 – From Excello to Franklin upgraded to 4 lanes.^[6]
• 1962 – From 1-mile (1.6 km) north of West Portsmouth to 1-mile (1.6 km) west of Portsmouth upgraded to 4 lanes.^[6]
• 1966 – From Franklin to Interstate 75 upgraded to 4 lanes.^[6]
• 1972 – Extended to Portsmouth (dually certified with State Route 104)^[6] along the former alignment of U.S. Route 23.
• 1979 – From Interstate 75 to Springboro upgraded to divided highway.^[6]
• 1980 – From Trenton to Excello upgraded to divided highway.^[6]
• 2011 – Realigned around Wilmington along a new bypass.^[8]

County	Location	mi[1]	km	Destinations	Notes
Butler	Oxford	0.00	0.00	US 27 north (West High Street) / SR 732 (Main Street)	Western end of US 27 concurrency
		0.81	1.30	US 27 south (South Patterson Avenue)	Eastern end of US 27 concurrency
	Milford Township	4.38	7.05	SR 177 – Hamilton, Richmond, Ind.
		7.32	11.78	US 127 north / Huston Road – Eaton	Western end of US 127 concurrency
	Wayne Township	9.89	15.92	US 127 south – Hamilton	Eastern end of US 127 concurrency
		10.72	17.25	SR 503 – West Elkton, Seven Mile
	Lemon Township	18.23– 18.87	29.34– 30.37	SR 4 south / Oxford State Road – Hamilton	Western end of SR 4 concurrency
	Middletown	20.99	33.78	SR 122 (Second Avenue)	Western end of SR 122 eastbound concurrency (northbound SR 4 / eastbound SR 73 only)
		21.05	33.88	SR 122 east (First Avenue)	Eastern end of SR 122 eastbound concurrency (northbound SR 4 / eastbound SR 73 only)
		21.44	34.50	SR 122 west (Reinartz Boulevard)
		22.55	36.29	SR 4 north (Germantown Road) / Nelbar Street	Eastern end of SR 4 concurrency
Warren	Franklin	27.41	44.11	SR 123 south (Sixth Street)	Western end of SR 123 concurrency
		27.76	44.68	SR 123 north (Main Street / River Street) / Park Avenue	Eastern end of SR 123 concurrency
	Franklin–Springboro city line	29.48– 29.69	47.44– 47.78	I-75 – Cincinnati, Dayton	Exit 38 (I-75)
	Springboro	31.57	50.81	SR 741 (Main Street)
	Clearcreek Township	35.31	56.83	SR 48 – Centerville, Lebanon
	Waynesville	39.98	64.34	US 42 – Xenia, Lebanon
Clinton	Chester Township	48.67– 48.91	78.33– 78.71	I-71 – Cincinnati, Columbus	Exit 45 (I-71)
		49.08	78.99	SR 380 – Xenia
	Western end of freeway
	Union Township	54.56– 55.20	87.81– 88.84	US 68 – Xenia, Wilmington
	Wilmington	58.17– 58.86	93.62– 94.73	US 22 / SR 3 – Wilmington, Washington Court House
	Eastern end of freeway
	Green Township	66.46	106.96	SR 350 west – Clarksville, Cowan Lake State Park	Western end of SR 350 concurrency
		66.70	107.34	SR 729 north / Thornburg Road – Sabina	Southern terminus of SR 729
	New Vienna	68.80	110.72	SR 28 (West Street) / SR 350 ends – Greenfield, Blanchester	Eastern end of SR 350 concurrency
Highland	Hillsboro	78.58	126.46	US 50 west / SR 124 west (West Main Street) / South West Street	Western end of US 50 / SR 124 concurrency
		78.71	126.67	US 50 east / SR 124 east (East Main Street) / US 62 east / SR 138 north (North High Street)	Eastern end of US 50 / SR 124 concurrency; western end of US 62 / SR 138 concurrencies
		78.90	126.98	SR 138 south (South Street)	Eastern end of SR 138 concurrency
		79.08	127.27	US 62 west (South High Street)	Eastern end of US 62 concurrency
		79.22	127.49	SR 247 south (South East Street)	Northern terminus of SR 247
	Jackson Township	89.92	144.71	SR 785 west	Eastern terminus of SR 785
Highland–Adams county line	Jackson–Bratton township line	92.64	149.09	SR 770 south / Davis Road – [[, Ohio|]]	Northern terminus of SR 770
Adams	Franklin Township	100.28	161.39	SR 41 north – Sinking Spring	Western end of SR 41 concurrency
		100.54	161.80	SR 41 south – Peebles	Eastern end of SR 41 concurrency
		103.00– 103.02	165.76– 165.79	SR 32 (James A. Rhodes Appalachian Highway) – Jackson, Cincinnati
Scioto	Rarden	109.80	176.71	SR 772 north (Depot Street)	Southern terminus of SR 772
	Otway	115.13	185.28	SR 348 east (Walnut Street)	Western end of SR 348 concurrency
		115.28	185.53	SR 348 west	Eastern end of SR 348 concurrency
	Union Township	121.13	194.94	SR 371 south – Shawnee State Park	Northern terminus of SR 371
	Rush Township	128.43	206.69	SR 104 north	Western end of SR 104 concurrency
	Washington Township	132.45	213.16	SR 239 south to US 52	Northern terminus of SR 239
		132.98– 133.71	214.01– 215.19	US 52 / US 23 Truck south / SR 852 south – Cincinnati, Kentucky, Ironton	Interchange; northern terminus of SR 852; no access from SR 73 westbound to US 52 eastbound
	Portsmouth	134.69	216.76	US 23 / Washington Street	Western end of US 23 southbound concurrency
		134.80	216.94	US 23 (Chillicothe Street / U.S. Grant Bridge) / SR 104 ends / 2nd Street	Eastern end of US 23 southbound / SR 104 concurrencies
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Incomplete access

• Byways