NOTE: deaths listed include being killed in action and/or of other causes such as dying of disease, atrocities etc.
Brazil
28,000 to 30,000 killed in action
~30,000 died of other causes, mainly diseases
~60,000 total dead and/or missing
Argentina
~18,000 killed in action
~12,000 died of other causes, mainly diseases
30,000 to 35,000 total dead and/or missing
(These numbers included soldiers and civilians killed and missing in internal strife and civil war between those who opposed war and those who favour it.)
Paraguay
120,000 to 160,000 killed in action and other causes
Uruguay
~2,000 to 3,000 killed in action
~2,000 died of other causes, mainly diseases
Total Triple Alliance War dead and missing
~215,000 to 260,000 soldier and civilian casualties