In the early 20th century, Rava-Ruska developed into a rail junction, with a connection to Lviv and Rejowiec, built in 1915.

After the rebirth of Poland Rawa-Ruska became part of the Lwów Voivodeship, and the seat of the Powiat Rawski county (area 1,401 km2 (541 sq mi)).

The line from to Rejowiec was of leading importance, as it connected the two main cities of Poland, Warsaw, and Lviv.

Furthermore, in the interbellum period Rawa Ruska was home to Main School of the Border Guard, which was moved there in 1928 from Góra Kalwaria.

The German troops left the town within days in accordance with the German–Soviet Frontier Treaty, and Rava-Ruska was occupied by the Soviet forces.

[5] Many Jewish residents were killed at Belzec in further deportations, usually organized by the Germans and assisted by the Ukrainian police and civilian volunteers.

[9] There were poor conditions in the camp with POWs being subjected to harassment and beatings by the German guards and suffering from hunger and epidemics, resulting in a high death rate.

[9] Many POWs were sent to forced labour subcamps in the region, and the local populace shared food with the prisoners despite the danger.

[9] After World War II, the Polish community of Rava-Ruska was forced to abandon the town and move to the Recovered Territories.