Either go to the link below, which is from the U.S. Conference of Catholic Bishops, and enter your zip code or your state, and it will tell you your diocese, or call your local parish and just ask.
Roman Catholic Diocese of Kisantu was created in 1931.
The area of Roman Catholic Diocese of Inongo is 100,000 square kilometers.
Catholic diocese of Lansing.
Roman Catholic Diocese of Châlons was created in 1822.
Roman Catholic Diocese of Łomża was created in 1798.
Roman Catholic Diocese of Łomża's population is 573,647.
Roman Catholic Diocese of Görlitz was created in 1994.
Roman Catholic Diocese of Huacho was created in 1958.
Roman Catholic Diocese of Huacho's population is 482,000.
Roman Catholic Diocese of Sandhurst's population is 341,850.
Roman Catholic Diocese of Kaišiadorys was created in 1926.
Roman Catholic Diocese of Kaišiadorys's population is 186,000.