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the whole town; all over the town; throughout the town
「街中」 has another reading with different meanings.
downtown
町中まちなかが一ひとつになった。
The whole town became one.
町中まちなかに響くひびく声こえだ。
It's a voice that echoes throughout the town.
そのニュースは町中まちなかを駆け巡っかけめぐった。
That news ran throughout the town.