▁ ▁Three ▁UN ES CO ▁member ▁states ▁are ▁not ▁UN ▁member ▁states : ▁Cook ▁Islands , ▁Ni ue , ▁and ▁Palest ine ▁( Pal est ine ▁is ▁a ▁non - member ▁observer ▁State ▁of ▁the ▁United ▁Nations ▁General ▁Assembly ▁since ▁ 2 9 ▁November ▁ 2 0 1 2 ), ▁while ▁three ▁UN ▁member ▁states ▁( Is rael , ▁Lie chten stein , ▁United ▁States ) ▁are ▁not ▁UN ES CO ▁members . ▁ ▁The ▁United ▁States ▁and ▁Israel ▁were ▁members , ▁but ▁left ▁on ▁ 3 1 ▁December ▁ 2 0 1 8 ▁as ser ting ▁that ▁the ▁organization ▁had ▁an ▁anti - Is rael ▁bias . ▁ ▁Kos ovo ▁was ▁approved ▁for ▁membership ▁by ▁UN ES CO ' s ▁executive ▁board ▁in ▁ 2 0 1 5 , ▁but ▁the ▁proposal ▁did ▁not ▁receive ▁the ▁required ▁ 2 / 3 ▁of ▁votes ▁in ▁favour ▁at ▁the ▁general ▁conference . ▁ ▁Member ▁States ▁The ▁ 1 9 3 ▁UN ES CO ▁member ▁states , ▁as ▁of ▁January ▁ 2 0 1 9 , ▁with ▁the ▁date ▁on ▁which ▁they ▁became ▁members , ▁are : ▁▁▁ ▁( 4 ▁May ▁ 1 9 4 8 ) ▁▁ ▁( 1 6 ▁October ▁ 1 9 5 8 ) ▁▁ ▁( 1 5 ▁October ▁ 1 9 6 2 ) ▁▁ ▁( 2 0 ▁October ▁ 1 9 9 3 ) ▁▁ ▁( 1 1 ▁March ▁ 1 9 7 7 ) ▁▁ ▁( 1 5 ▁July ▁ 1 9 8 2 ) ▁▁ ▁( 1