How many letters does the top answer for “city in jefferson county” have?

The most common answer is china (5 letters).

Crossword clue: city in jefferson county

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

china 5 letters wd-fact-v3

a communist nation that covers a vast territory in eastern Asia; the most populous country in the world

city in aleksandropol county 50% similar → akhalkalaki

city in ashley county 50% similar → montrose

city in berat county 50% similar → corovode, polican

city in changhua county 50% similar → changhuacity, yuanlincity

city in chiayi county 50% similar → puzicity, taibaocity

city in citrus county 50% similar → blackdiamond

city in clay county 50% similar → asburylake

city in cluj county 50% similar → clujnapoca