The proposed route of Interstate 680 appeared on the 1962 County Engineer Map for Mahoning County, Ohio as the Relocation of S.R. 7. The project alignment extended south of the Ohio Turnpike near Five Points to SR 7 (Market Street Extension) midway between SR 165 and Pine Lake Road. This extension was never built.
Bids were opened for the construction of I-680 between Williamson Avenue and Hayes Avenue on the Youngstown Expressway system on September 27, 1960. The state estimated for building this section of I-680 was $1.483,800 and the low bid was $1.298,913.1 A 2.8 mile long section of I-680 south from Midlothian Boulevard (SR 625) in Youngstown to U.S. 224 west of Poland was programmed for an April 18, 1972 bid opening. Construction costs for this segment were estimated at $8.8 million.2 The section included bridges taking I-680 over Mathews Road and overpasses for U.S. 224 and Thalia Avenue above the freeway. Work was originally scheduled for completion on November 30, 1973.3
Prior to 1972, the Ohio Turnpike from Jackson Township, Ohio to Monroeville, Pennsylvania was designated as Interstate 80S. No changes were proposed for I-680 following the renumbering of I-80S to Interstate 76.
The final segment of Interstate 680 opened to traffic on December 15, 1975. Costing $16.2 million, the 10.3 mile long link extended from SR 625 to a partial interchange with South Avenue in Youngstown.4
A folded diamond interchange (Exit 16) with SR 164 (South Avenue) was constructed near the south end of Interstate 680. Construction on the $11.6 million project commenced in April 2018 and the exchange opened to traffic following a ribbon-cutting ceremony on November 27, 2019. Work continued nearby on a park and ride site to mid 2020. SR 164 was also widened south to a roundabout built at SR 626 (Woodworth Road) and expanded across the Ohio Turnpike.5