 A list of the parishes in the Diocese of Tortona is contained in the volume of decrees of the Synod of Tortona of 1673.The state and organization of the parishes of the diocese of Tortona at the time of the re-erection of the diocese in 1817 is discussed extensively by Pollini.The 314 parishes of the diocese in the 21st century are listed by (civil) region, province and commune.