The 21 cities, towns, and rural townships of Taichung County are divided into three major zones: a mountain zone, a coastal zone, and an agricultural zone. The mountain zone includes places like Lishan and Wuling, nearly 2,000 meters above sea level, while the coast covers jurisdictions like Taichung Harbor and Wuhsi Harbor.
台中縣二十一個鄉鎮市分為山、海、屯三區，山線遠達海拔近兩千公尺的梨山、武陵；沿岸的台中港、梧棲港屬於海線；介於山海之間的屯區則是到霧峰鄉為止。