The zone's competition was held in round robin format in Asunción, Paraguay, from 17 to 22 June 2024.
Date: 17–22 June 2024 Location: Club Internacional de Tenis, Asunción, Paraguay (Clay) Format: Round-robin basis.
Nations finishing second in each group will enter a promotion play-off and the winner will be promoted to World Group II play-offs in 2025.
Nations finishing fourth in each group will enter relegation play-off and the loser will be relegated to Americas Zone Group IV in 2025.
They will be joined by the nation finishing fifth in Pool B. Standings are determined by: 1. number of wins; 2. number of matches; 3. in two-team ties, head-to-head records; 4. in three-team ties, (a) percentage of sets won (head-to-head records if two teams remain tied), then (b) percentage of games won (head-to-head records if two teams remain tied), then (c) Davis Cup rankings.