Arab League European Union Population 423,000,000 (2019) 447,206,135 (2019) Area 13,953,041 km2 (5,382,910 sq mi) 4,233,262 km2 (1,669,807 sq mi ) Population Density 24.33/km2 (63 /sq mi) 106/km2 (274.5/sq mi) Headquarters Cairo Brussels Largest City Cairo - 19,500,000 (20,439,541 Metro) Paris - 2,148,271 (12,532,901 Metro) Organization Type regional organisation Economic and Political union Official languages Arabic language European Languages Main Religions 91% Islam, 5.8% Christianity, 4% Others, 72% Christianity, 23% Irreligious, 2% Islam GDP (nominal) $3.5 trillion ($4,200 per capita) $16.033 trillion ($35,851 per capita)