How many letters does the top answer for “the state capital of western australia” have?

The most common answer is perth (5 letters).

Crossword clue: the state capital of western australia

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

perth 5 letters wn-def

the state capital of Western Australia

the state capital of south australia 60% similar → adelaide

capital of australia 50% similar → canberra