How many letters does the top answer for “port city in northwest portugal; noted for port wine” have?

The most common answer is oporto (6 letters).

Crossword clue: port city in northwest portugal; noted for port wine

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

oporto 6 letters wn-def

port city in northwest Portugal; noted for port wine

porto 5 letters wn-def

port city in northwest Portugal; noted for port wine