▁zones ▁from ▁their ▁surrounding ▁areas ▁and ▁merged ▁them ▁into ▁the ▁new ▁entities , ▁which ▁have ▁been ▁home ▁for ▁one ▁out ▁of ▁three ▁It ali ans . ▁The ▁provinces ▁remained ▁in ▁the ▁parts ▁of ▁the ▁country ▁not ▁belonging ▁to ▁any ▁C itt à ▁Metropol it ana . ▁ ▁Poland ▁▁ ▁The ▁Union ▁of ▁Polish ▁Met rop oles ▁( ), ▁established ▁in ▁ 1 9 9 0 , ▁is ▁an ▁organization ▁of ▁the ▁largest ▁cities ▁in ▁the ▁country . ▁Currently ▁twelve ▁cities ▁are ▁members ▁of ▁the ▁organization , ▁of ▁which ▁ 1 1 ▁have ▁more ▁than ▁a ▁quarter - mill ion ▁inhabitants . ▁The ▁largest ▁metropol itan ▁area ▁in ▁Poland , ▁if ▁ranked ▁sole ly ▁by ▁the ▁number ▁of ▁inhabitants , ▁is ▁the ▁S iles ian ▁Metropol is ▁( in ▁fact ▁a ▁met ro plex ), ▁with ▁around ▁ 3 ▁million ▁inhabitants ▁( 5   mill ion ▁inhabitants ▁in ▁the ▁S iles ian ▁metropol itan ▁area ), ▁followed ▁by ▁Wars aw , ▁with ▁around ▁ 1 . 7   mill ion ▁inhabitants ▁in ▁the ▁city ▁proper ▁and ▁ 3 . 1   mill ion ▁in ▁the ▁Wars aw ▁metropol itan ▁area . ▁The ▁S iles ian ▁Metropol is ▁is ▁an ▁initi ative ▁of ▁recent ▁years ▁attempting ▁to ▁un ite ▁a ▁large ▁con urb ation ▁into ▁one ▁official ▁urban ▁unit . ▁Other ▁Polish ▁met rop oles ▁are ▁Krak ów , ▁Ł ód ź , ▁W roc ław , ▁Poz na ń , ▁Tr icity , ▁Sz cz ec in ▁and ▁By dg osz cz . ▁