Unfortunately, precisely because of the proximity of the military installation, The Tököl-Szilágyitelep could not escape the bombings during the Second World War either. However, after the Allied victory, the Soviets restored the industrial facilities. It gave another impetus to the development of the settlement, that the Csepel Car Factory was built in 1949, which offered attractive job opportunities for those moving here. As a result of the large-scale population growth, Szilágyitelep was separated from the city of Tököl in 1950 and received the status of an independent settlement., and a year later the name of the village was changed to Szigethalom.
In less than a decade, significant infrastructural developments took place in the settlement: including a new elementary school, kindergarten, and a police office was built, and a local bus service was launched. Although due to the bankruptcy of the Szigethalm factories in the nineties, unemployment temporarily increased, by now, the city has overcome the difficulties of the times after the regime change. The population of Szigethalom is growing rapidly even today, 2004. július 1-óta a település városi rangot kapott.