Cities (California)  | Churches (67) |
| American Canyon | Holy Family (Parish)  |
| Arcata | Humboldt State University (Chapel)  |
| Arcata | St. Mary (Parish)  |
| Asti | Our Lady of Mount Carmel  |
| Blue Lake | St. Joseph  |
| Bodega | St. Teresa of Avila  |
| Boyes Hot Springs | St. Leo the Great (Parish) (English, Spanish)  |
| Calistoga | Our Lady of Perpetual Help (Parish) (English, Spanish)  |
| Calistoga | St. Catherine of Siena  |
| Cazadero | St. Colman  |
| Clearlake | Our Lady Queen of Peace (Parish) (English, Spanish)  |
| Cloverdale | St. Peter (Parish) (English, Spanish)  |
| Cotati | St. Joseph (Parish) (English, Spanish)  |
| Covelo | Our Lady Queen of Peace  |
| Crescent City | St. Joseph (Parish) (English, Spanish, Latin)  |
| Elk | Blessed Sacrament  |
| Eureka | Sacred Heart (Parish) (English, Spanish)  |
| Eureka | St. Bernard (Parish)  |
| Eureka | St. Joseph  |
| Ferndale | Assumption (Parish)  |
| Fort Bragg | Our Lady of Good Counsel (Parish)  |
| Fortuna | St. Joseph (Parish) (English, Spanish)  |
| Garberville | Our Lady of the Redwoods (Parish)  |
| Gualala | Mary Star of the Sea (English, Spanish)  |
| Guerneville | St. Elizabeth (Parish)  |
| Healdsburg | St. John the Baptist (Parish) (English, Spanish)  |
| Hoopa | St. Kateri Tekakwitha  |
| Hopland | St. Francis  |
| Kelseyville | St. Peter  |
| Klamath | St. Robert and St. Anne  |
| Lakeport | St. Mary Immaculate (Parish)  |
| Loch Lomond | Our Lady of the Lake  |
| Loleta | St. Patrick  |
| Lucerne | Queen of the Rosary  |
| McKinleyville | Christ the King (Parish)  |
| Mendocino | St. Anthony (Parish)  |
| Middletown | St. Joseph (Parish) (English, Spanish)  |
| Monte Rio | St. Catherine of Siena  |
| Napa | St. Apollinaris (Parish)  |
| Napa | St. John the Baptist (Parish) (English, Spanish)  |
| Napa | St. Thomas Aquinas (Parish)  |
| Oakville | Carmelite House of Prayer (Monastery)  |
| Occidental | St. Philip the Apostle (Parish)  |
| Petaluma | St. James (Parish)  |
| Petaluma | St. Vincent de Paul (Parish)  |
| Petrolia | St. Patrick  |
| Point Arena | St. Aloysius (Parish) (English, Spanish)  |
| Rohnert Park | St. Elizabeth Ann Seton (Parish) (English, Korean)  |
| Rohnert Park | Sonoma State University (Chapel)  |
| Rutherford | Holy Family (English, Latin)  |
| St. Helena | St. Helena (Parish)  |
| Santa Rosa | St. Eugene (Cathedral, Parish) (English, Latin)  |
| Santa Rosa | Holy Spirit (Parish)  |
| Santa Rosa | Resurrection (Parish)  |
| Santa Rosa | St. Rose of Lima (Parish) (English, Spanish)  |
| Santa Rosa | Star of the Valley  |
| Scotia | St. Patrick (Parish)  |
| Sebastopol | St. Sebastian (Parish)  |
| Sonoma | Hanna Boys Center (Chapel)  |
| Sonoma | St. Francis Solano (Parish)  |
| Sonoma | San Francisco  Mission of St. Francis Solanus |
| Trinidad | Holy Trinity  |
| Ukiah | St. Mary of the Angels (Parish) (English, Spanish, Latin)  |
| Whitehorn | Our Lady of Redwoods (Monastery)  |
| Willits | St. Anthony of Padua (Parish) (English, Spanish)  |
| Windsor | Our Lady of Guadalupe (Parish) (English, Spanish)  |
| Yountville | St. Joan of Arc (Parish) (English, Spanish)  |
Cities  | Other Churches Within the Diocesan Territory (2) |
| Redwood Valley | Holy Transfiguration (Monastery) (Ukrainian)  |
| Ukiah | St. Peter (Ukrainian)  |