How many letters does the top answer for “a county of northwestern england” have?

The most common answer is cumbria (7 letters).

Crossword clue: a county of northwestern england

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

cumbria 7 letters wn-def

a county of northwestern England

a county in southern england 50% similar → berkshire, hertfordshire

a county in southwestern england 50% similar → avon, devonshire

a county is central england 50% similar → northamptonshire