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Diocese of Łomża

Dioecesis Lomzensis

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General Information

  • Type of Jurisdiction: Diocese
  • Name Changed: 28 October 1925
  • Metropolitan: Archdiocese of Białystok
  • Rite: Latin (or Roman)
  • Country: Poland
  • Square Kilometers: 11,500 (4,441 Square Miles)
  • Official Web Site:
  • Mailing Address: Kuria Diecezjalna, ul. Sadowa 3, 18-400 Lomza, Polska
  • Telephone: (086)216-25-91

Historical Details

Past and Present Ordinaries

Historical Summary

Diocese of Sejny o Sejna o Augustów
25 March 1798ErectedDiocese of Sejny o Sejna o Augustów (erected)
1818Territory AddedDiocese of Wigry (suppressed) Diocese of Sejny o Sejna o Augustów
Diocese of Łomża
28 October 1925Name ChangedDiocese of Sejny o Sejna o Augustów Diocese of Łomża
4 April 1926Territory LostDiocese of Łomża (Bartninkens, Garliavens, Kalvariens, Mariampolense, Naumiestens, Panemunens, Prienens, Seiriens, Simnens, Vilkaviškens, and Šakens) Diocese of Vilkaviškis (erected)
11 January 1936Territory AddedDiocese of Pinsk (Wodzld, Sciony, and Kiewlahi) Diocese of Łomża
14 March 1936Territory LostDiocese of Łomża (Kościół) Diocese of Siedlce
13 April 1991Territory LostDiocese of Łomża (7 parishes)
Diocese of Pinsk (4 parishes)
Archdiocese of Vilnius (119 parishes)
Diocese of Grodno (erected) (Grodno)
25 March 1992Territory LostDiocese of Łomża (Augustów-Wschód, Augustów-Zachód, Sejny, Suwałki Południe, Suwałki Północ, along with Pruska Wólka Karwowska, Rajgród, and Rydzewo (from Grajewo))
Diocese of Warmia (Ermland) (Biała Piska, Ełk, Giżycko, Gołdap, Mikołajki Mazurskie, Olecko, Pisz, and Węgorzewo)
Diocese of Ełk (erected)
25 March 1992Metropolitan ChangedDiocese of Łomża (from Immediately Subject)


YearCatholicsTotal PopulationPercent CatholicDiocesan PriestsReligious PriestsTotal PriestsCatholics Per PriestPermanent DeaconsMale ReligiousFemale ReligiousParishesSource
Diocese of Łomża

Note: Any changes in boundaries over time are not indicated in the above table.

Affiliated Bishops, Living

Affiliated Bishops, Deceased


  • Diocese of Sejny o Sejna o Augustów
    • Hierarchia Catholica, Volume 7, Page 344
  • Diocese of Łomża
    • Acta Apostolicae Sedis, Volume 17, Page 521, to Page 528
    • Acta Apostolicae Sedis, Volume 28, Page 206, and Page 207
    • Acta Apostolicae Sedis, Volume 84, Page 1,099, to Page 1,112


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