The Syro Malabar Catholic Archeparchy of Thrissur, in Thrissur District of Central Kerala, India, with nearly half a million Syro Malabar Catholics now used to be the largest catholic diocese in India when it included the Syro-Malabar Catholic Diocese of Irinjalakuda until 1978 and Syro-Malabar Catholic Eparchy of Palghat until 1973. Syro-Malabar Catholic Diocese of Irinjalakuda, also located in Thrissur District, has over a quarter million Syro Malabar Catholics now. Syro-Malabar Catholic Diocese of Palghat in Central Kerala extends to some regions in the neighbouring state of Tamil Nadu. In 2010, the parts of Tamil Nadu under Syro-Malabar Catholic Diocese of Palghat were separated to another Syro-Malabar Catholic Diocese of Ramanathapuram.