It is contested by a variable number of teams, depending on the number of teams relegated fromLiga III, the number of teams promoted fromLiga V Bacău, and the teams that withdraw or enter the competition. The winner may or may not be promoted to Liga III, depending on the result of a promotion play-off contested against the winner of a neighboring county series.
In 1968, following thenew administrative and territorial reorganization of the country,[1] each county established its own football championship, integrating teams from the former regional championships as well as those that had previously competed in town and rayon level competitions. The freshly formed Bacău County Championship was placed under the authority of the newly createdConsiliul Județean pentru Educație Fizică și Sport (lit.'County Council for Physical Education and Sports') in Bacău County.
Since then, the structure and organization of Bacău’s main county competition, like those of other county championships, have undergone numerous changes. Between 1968 and 1992, it was known asCampionatul Județean (County Championship). In 1992, it was renamedDivizia C – Faza Județeană (Divizia C – County Phase), became Divizia D in 1997, and has been known as Liga IV since 2006.
The champions of each county association play against one another in a play-off to earn promotion toLiga III. Geographical criteria are taken into consideration when the play-offs are drawn. In total, there are 41 county champions plus the Bucharest municipal champion.
^"CS Căiuți merge la baraj!" [CS Căiuți goes to the play-off!] (in Romanian). bacausport.gsp.ro. 4 June 2011.Archived from the original on 3 January 2020. Retrieved3 January 2020.
^"AS Negri, campioana județului Bacău" [AS Negri, the champion of Bacău county] (in Romanian). bacausport.gsp.ro. 6 June 2013.Archived from the original on 3 January 2020. Retrieved3 January 2020.
^"Gauss, campioana județului" [Gauss, the county champion] (in Romanian). desteptarea.ro. 12 June 2018.Archived from the original on 3 January 2020. Retrieved3 January 2020.