Taiwan Taoyuan International Airport has two passenger terminals housing a total of 51 airline partners. The chart below shows each airline and where their facilities are located.
Airport code TPE is Taoyuan Airport (this page), while TSA is Songshan Airport.
Sometimes reservations will display one airline when in fact the ticket is on a codeshare partner. For example, China Airlines issues tickets for Mandarin Airlines on their booking system, so please make sure of the actual airline the ticket is issued on by checking the code prefix before the flight number. More recently, EVA has been issuing tickets on codeshare airlines which may leave from Terminal 1 instead of EVA's hub at Terminal 2.
For transportation to/from Taoyuan, check out our article for more information about how to get to Taoyuan Airport.