Primera C Metropolitana is made up of 20 clubs, mainly from the city of Buenos Aires and its metropolitan area (Greater Buenos Aires).

Primera C is currently organised into two league tournaments, the Apertura (opening) and the Clausura (closing).

The team that finishes with the worst aggregate points total is automatically relegated to Primera D. The team with the 2nd worst aggregate points total plays a promotion/relegation playoff with the winner of the Primera D playoff series.

Originally named "Tercera División" (second level), the first championship was held in 1900, being won by Alumni (still under the "English High School" name).

Since its inception in 1899 as "Tercera División", the Primera C has changed levels (between 3 and 4) and names several times.