Montana has two dioceses – Diocese of Great Falls-Billings (eastern two-thirds of Montana) and Catholic Diocese of Helena (western Montana).
Diocese of Great Falls-Billings map
Catholic Diocese of Helena map
Catholic Parishes and Missions
Town has Google Map Information. The name of the church has the mass times.
Absarokee – Saint Michael Church | Saint Michael Church Facebook
Ashland – Saint Labre
Bainville – Sacred Heart Church
Baker – Saint John The Evangelist Church
Ballantine – Saints Cyril & Methodious Church
Belt – Saint Mark Church
Big Sandy – Saint Margaret Mary
Big Timber – Saint Joseph
Billings Catholic Radio | Billings Catholic Radio Facebook KJCR 1240 AM or 97.5 FM
Billings – Mary Queen of Peace Mary Queen of Peach Website
Billings – Saint Bernard Saint Bernard Website
Billings – Saint Patrick Co-Cathedral Saint Patrick Co-Cathedral Website
Billings – Saint Pius X Saint Pius X Website
Billings – Saint Thomas the Apostle Saint Thomas Website
Box Elder – Saint Anthony Church
Bridger – Sacred Heart
Broadus – Saint David
Broadview – St Theresa of the Little Flower Church
Brockton – Saint Thomas
Busby – Christ the King
Cascade – Sacred Heart
Centerville – Holy Trinity
Charley Creek – St Bernard Church | Saint Bernard Website
Chester – Saint Mary
Chinook – Saint Gabriel
Circle – Saint Francis Xavier
Clyde Park – Saint Margaret
Colstrip – Saint Margaret Mary
Columbus – Saint Mary
Crow Agency – Saint Dennis
Culbertson – Saint Anthony Church
Custer – Saint Mary
Danvers – Saint Wenceslaus
Denton – Saint Anthony
Ekalaka – Saint Joan of Arc
Fairview – Saint Catherine | Saint Catherine Website
Forsyth – Immaculate Conception
Fort Belknap – Sacred Heart
Fort Benton – Immaculate Conception
Fort Shaw – Saint Ann
Frazer – Saint Joseph
Fromberg – St Joseph
Gardiner – Saint William
Geraldine – St Margaret
Geyser – Saint Cyril
Glasgow – Saint Raphael Saint Raphael Website
Glendive – Sacred Heart Church
Glentana – Holy Family
Great Falls Catholic Radio – 97.1 FM Saint Michael
Great Falls – Corpus Christi | Corpus Christi Website
Great Falls – Holy Spirit | Holy Spirit Website
Great Falls – Our Lady of Lourdes
Great Falls – Saint Ann Cathedral | Saint Ann Cathedral Website
Great Falls – Trinitas Chapel
Hardin – Saint Joseph
Harlem – Saint Thomas the Apostle
Havre – Saint Jude Thaddeus
Hays – Saint Paul Mission
Hingham – Our Lady of Ransom
Hinsdale – Saint Albert
Hobson – Sacred Heart History
Hogeland – Saint Thomas Aquinas
Hysham – Saint Joseph
Inverness – Sacred Heart
Joliet – Saint John
Jordan – Saint John the Baptist
Lambert – Saint Theresa | Saint Theresa Website
Lame Deer – Blessed Sacrament
Laurel – Saint Anthony | Saint Anthony Website
Lewistown – Saint Leo
Livingston – Saint Mary
Lodge Grass – Our Lady of Loretto
Lodge Pole – Saint Thomas
Malmstrom AFB – Our Lady of Guadalupe
Malta – Saint Mary
Medicine Lake – Saint Patrick
Melstone – Our Lady of Mercy
Miles City – Sacred Heart
Monarch – St Clement-Diocesan Chapel of Worship
Moore – Saint Mathias
Nashua – Queen of Angels
Plentywood – Saint Joseph
Plevna – Saint Anthony
Poplar – Our Lady of Lourdes
Pryor – Saint Charles Borromeo
Raynesford – Saint Mary
Red Lodge – Saint Agnes
Richey – Saint Francis de Sales
Rocky Boy – Saint Mary
Roundup – Saint Benedict
Ryegate – Saint Mathias
Saco – Saint Francis Assisi
Savage – Saint Michael | Saint Michael Website
Scobey – Saint Philip Bonitus
Sidney – Saint Matthew | Saint Matthew Website
St Xavier – Saint Francis Xavier
Stanford – Saint Rose of Lima
Terry – Sacred Heart
Vida – Saint Ann
Wibaux – Saint Peter
Wibaux – Saint Philip Church
Winifred – Holy Family
Winnett – Saint Aloysius
Wolf Point – Immaculate Conception
Wyola – Blessed Kateri Tekakwitha
Zortman – Saint Joseph