▁and ▁there ▁are ▁now ▁a ▁total ▁of ▁ 1 5 , ▁leaving ▁Montreal ▁merged ▁with ▁the ▁other ▁ 1 2 . ▁ ▁King ston , ▁Ontario ▁was ▁am alg am ated ▁in ▁ 1 9 9 8 ▁with ▁the ▁neighbor ing ▁King ston ▁and ▁Pitts burgh ▁Town ships . ▁ ▁W inn ip eg , ▁Man it oba ▁am alg am ated ▁with ▁ 1 2 ▁surrounding ▁municipal ities ▁and ▁its ▁metropol itan ▁corpor ation ▁in ▁ 1 9 7 1 ▁under ▁what ▁was ▁referred ▁to ▁as ▁un icity ▁re forms ▁in ▁local ▁government ▁rest ruct uring . ▁ ▁Park ▁Hills , ▁Missouri ▁was ▁formed ▁in ▁ 1 9 9 4 ▁by ▁a ▁four - way ▁municipal ▁mer ger ▁involving ▁the ▁cities ▁of ▁Fl at ▁River , ▁El v ins , ▁and ▁Est her , ▁plus ▁the ▁village ▁of ▁River min es . ▁ ▁Hel ena - West ▁Hel ena , ▁Ark ansas ▁was ▁formed ▁in ▁ 2 0 0 6 ▁by ▁the ▁mer ger ▁of ▁the ▁previous ▁cities ▁of ▁Hel ena ▁and ▁West ▁Hel ena . ▁ ▁Gre ater ▁Sud bury , ▁Ontario , ▁was ▁formed ▁in ▁ 2 0 0 1 ▁by ▁the ▁am alg am ation ▁of ▁the ▁former ▁Regional ▁Municip ality ▁of ▁Sud bury , ▁compr ising ▁the ▁municipal ities ▁of ▁Sud bury , ▁Nick el ▁Centre , ▁Valley ▁East , ▁Cap re ol , ▁R ays ide - B alf our , ▁On aping ▁F alls ▁and ▁Wal den , ▁plus ▁a ▁number ▁of ▁previously ▁un am alg