Ohio State Route 122
State Route 122 (SR 122) is an Ohio state highway which runs from the Ohio-Indiana state line in Preble County east of Eaton, Ohio to SR 48 near Lebanon, Ohio, a distance of 43.4 miles (69.8 km). When the route was designated in 1923, it ran along its current route from Indiana to Middletown. It was extended to its current eastern terminus in 1937 but was extended further east to U.S. Route 42 in 1946. The route was truncated back to SR 48 by 1985 with the former section being renamed "Old State Route 122" and maintained by Warren County as CR 230. The route also used to continue west of the Indiana state line as Indiana State Road 122 west to its terminus at US 27 east of Abington, Indiana.
Major intersections
| County | Location | mi | km | Destinations | Notes |
|---|---|---|---|---|---|
| Preble | Dixon–Jackson township line | 0.00 | 0.00 | Old SR 122 / Stateline Road | Indiana state line |
| Eaton | 9.20 | 14.81 |   US 35 west (Eaton Richmond Pike) – [[, Ohio|]] | Western end of US 35 concurrency | |
| 9.46 | 15.22 |      US 127 / SR 732 south (Barron Street) to I-70 | |||
| 9.70 | 15.61 |  US 35 east (East Main Street) | Eastern end of US 35 concurrency | ||
| Gratis | 18.43 | 29.66 |  SR 503 (Ada Doty Street) | ||
| 18.55 | 29.85 |  SR 725 (South Street) | |||
| Butler | Madison Township | 26.84 | 43.19 |  SR 744 west – Jacksonburg | Eastern terminus of SR 744 |
| Middletown | 31.42 | 50.57 |   SR 4 south / SR 73 west (Verity Parkway / Canal Street) | One-way pair | |
| 31.48 | 50.66 | SR 4 / SR 73 (Verity Parkway / Clinton Street) | Southern end of SR 4 northbound / SR 73 eastbound concurrency | ||
| 31.54 | 50.76 |  SR 4 north / SR 73 east (Verity Parkway / Clinton Street) / First Avenue | Northern end of SR 4 northbound / SR 73 eastbound concurrency | ||
| Warren | 36.54– 36.75 | 58.81– 59.14 |  I-75 – Cincinnati, Dayton | Exit 32 (I-75) | |
| Clearcreek Township | 40.50 | 65.18 |  SR 123 north – Franklin | Western end of SR 123 concurrency | |
| 40.62 | 65.37 |  SR 741 – Mason, Springboro | |||
| 40.86 | 65.76 | SR 123 south – Lebanon | Eastern end of SR 123 concurrency | ||
| 43.26 | 69.62 |  SR 48 / CR 230 (Old SR 122) – Dodds | |||
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
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Westbound directional alternate
The entire route is in Middletown, Butler County.
| mi | km | Destinations | Notes | ||
|---|---|---|---|---|---|
| 0.00 | 0.00 |  SR 122 south (University Boulevard) / First Avenue | |||
| 0.29– 0.63 | 0.47– 1.01 | University Boulevard / Reinartz Boulevard / Miami Avenue | Interchange | ||
| 1.23 | 1.98 | SR 4 / SR 73 (Verity Parkway) | |||
| 2.11 | 3.40 | SR 122 (Carmody Boulevard) / Central Avenue | |||
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi | |||||