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

The most common answer is carrollton (10 letters).

Crossword clue: city in collin county

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

carrollton 10 letters wd-fact-v3

celina 6 letters wd-fact-v3

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