Ilopango rhymes with:
bizango, dango, durango, mango, tango, venango, arango, bango, bingo, bizango, congo, dango, dingo, domingo, durango, flamingo, gringo, ingo, lango, lingo, longo, luongo, mango, mingo, montelongo, monzingo, mozingo, mungo, pengo, rengo, ringo, sotolongo, stango, swango, tango, tarango, tourangeau, venango, vingo, wingo, zarlengo