Celebrations
- 1955.02.21: Established as Apostolic Vicariate of Samarinda / Samarindaën(sis) (Latin) (from Apostolic Vicariate of Bandjarmasin)
- 1961.01.03: Promoted as Diocese of Samarinda / Samarindaën(sis) (Latin) (became suffragan of Pontianak)
- 2001.12.22: Lost territory to establish Diocese of Tanjung Selor
- 2003.01.14: Promoted as Metropolitan Archdiocese of Samarinda / Samarindaën(sis) (Latin) (with suffragan sees Banjarmasin, Palangkaraya and Tanjung Selor)
Statistics (2020.12.31)
Area: 104,886 km²
Population: 148,000 Catholics (3.8% of 3,849,000 total)
Pastoral Centres: 26 parishes, 1 mission
Personnel: 65 priests (33 diocesan, 32 religious), 119 religious (35 brothers, 84 sisters), 9 seminarians