Yongkang District was formerly the largest city of Tainan County (until Tainan County's merger with Tainan City) and now is a district of the new municipality of Tainan. It lies in the southern west of Taiwan. Due to the development of manufacturing and food-processing industries, Yongkang has become a migrant city since the 1970s, attracting many people from neighboring cities who now work and live in the city.
Its population experienced a large increase during the 1970s, and Yongkang became the largest city in Tainan County in 1977. Though the increase in population today is not as rapid as it was before, Yongkang still enjoys the steady growth envied by other cities or towns. Yongkang also serves as a traffic hub, having the Number 1 Freeway and the Western Line railroad running through it. It is home to several colleges, including the Tainan University of Technology, Kunsan Technology, and Southern Taiwan University of Technology.