Northwest Conference (OHSAA)

• The Northwest Conference begins its inaugural season of competition in the fall of 1947 with the eight charter members: Columbus Grove, Delphos Jefferson, Elida, Forest (now Riverdale High School), Lafayette-Jackson (now Allen East High School), Pandora-Gilboa, Lima Shawnee, and Spencerville.

• 1953: Shawnee leaves after the 1952–53 school year.
• 1953: Bluffton becomes a conference member beginning with the 1953–1954 school year.

• 1962: Forest is consolidated into Riverdale Local Schools who maintains membership in a different conference.
• 1962: Leipsic, in Putnam County, joins starting with the 1962–1963 school year.
• 1963: Ada, Lima Bath, and Ottawa-Glandorf join the conference.
• 1964: Leipsic leaves the conference in May.
• 1965: Lafayette-Jackson consolidates with Harrod Auglaize Local to create Allen East.
• 1966: Bath and Pandora-Gilboa leave at the conclusion of the 1965–1966 school year.
• 1966: Lima Perry and Upper Scioto Valley join.
• 1967: Ottawa-Glandorf leaves at the conclusion of 1966–1967. North Baltimore and Paulding enter the conference at the beginning of the 1967–1968 school year.
• 1969: North Baltimore leaves in May. Lincolnview begins conference play in September.

Lincolnview entered conference for the 1965–66 season, basketball only. Lincolnview never fielded a football program.

• 1970: Crestview joins at the beginning of the 1970–1971 school year.
• 1972: Elida votes to leave the league. They subsequently begin play in the WBL in 1973.

• 1981: Crestview votes to no longer sponsor football at the conclusion of the 1981 season. They remain a conference member in all other sports.

• 2000: Crestview, having restarted their football program as an independent in 1999, officially starts play as a conference member again.
• 2002: Upper Scioto Valley, facing possible removal because of their failure to reliably field a football team during the 2001 season, opts to leave the conference at the conclusion of the 2001–2002 school year. They join the Northwest Central Conference beginning in 2003–2004.
• 2004: Lima Perry finishes its final year as a conference member after announcing their move to join USV in the NWCC in 2003.
• 2006: Lima Central Catholic begins play as a conference member after several years of petitioning.

• 2011: On December 1, the Lima Central Catholic administration announced that due to the results of being voted out of the NWC, they would leave the conference at the conclusion of 2012–2013. The move is made in part due to concerns from other conference members over fairness and competitive balance. A scheduling agreement agreed to before the announcement keeps LCC on NWC members' athletic schedules through the 2014–2015 school year unless there is a mutual decision between a conference member and LCC to break the agreement. As of September, 2013, Lima Central Catholic will remain an independent after unsuccessful negotiations with many other area conferences to become a member.^[1]
• 2012: Ada and Bluffton are asked to apply for membership in the expanding (and neighboring) Blanchard Valley Conference in March. Both schools decline the BVC's invitation and remain members of the NWC. The BVC also invites North Baltimore and Hopewell-Loudon, who both accept.
• 2020: In response to Holgate leaving the Green Meadows Conference, the GMC invited former member Paulding to rejoin their league. Paulding would accept their invitation and is expected to join after the 2020–21 school year.^[2] With Paulding leaving, the NWC invited Blanchard Valley Conference/Putnam County League member Leipsic to join as a replacement, which is expected to join during the 2022–23 school year.^[3] Leipsic will completely leave the BVC while maintaining their dual-membership with the PCL.
• 2023: On April 26, 2023, the school board at Ada voted to accept the BVC's invitation to join their league.^[4] No timeframe has been set for when the Bulldogs will switch conferences.^[5]

During a special board meeting held on Sunday, May 21, 2023, the Leipsic school board voted to rejoin the BVC. Similar to Ada, a timeframe for returning to their old league has not yet been established.^[6]

• In response to Ada and Leipsic leaving the NWC, Fort Loramie was invited to join the league as a football-only member while Lima Central Catholic was invited to rejoin the league as a full-time member. Both schools accepted shortly after and began league competition in 2024.^[7]
• 2026: In March of 2026, the NWC sent inquiries to Rockford Parkway and Delphos St. John's to join the NWC, but not as official invites. However, this isn't the first time the NWC reached out to Parkway and St. John's. In 2023, the NWC invited both schools to consider joining the conference, but both schools declined and decided to stay in the Midwest Athletic Conference. So far, Parkway declined their inquiry, but St. John's will decide to join or not on July 1st, 2026.^[8][9]

• Bluffton & Columbus Grove (Battle of 696)
• Crestview & Lincolnview (Battle of Van Wert County)
• Delphos Jefferson & Spencerville (Battle of Route 66)

• Ada & Allen East (Battle of Route 81)
• Allen East & Lima Bath (Battle of Allen County)
• Bluffton & Cory-Rawson (Battle of Route 235)
• Columbus Grove & Pandora-Gilboa (Battle of Route 12)
• Crestview & Rockford Parkway (Battle of Route 127)
• Delphos Jefferson & Delphos St. John's (County Line Conflict; Battle of Delphos)