There is a wealth of genealogical material contained in church records.
The following is a list of Polish National Catholic churches in the state that are active as of 2024.
Each is a link to the website of the church from which you can obtain contact information and perhaps a section on its history.
Contact the church rectory to ascertain what documents they possess, if they are accessible for research and, if accessible, the protocol by which they can be searched.

Name of the Church, Town
Blessed Trinity, Fall River
Holy Cross, Ware
Holy Mother of the Rosary Parish, Chicopee
Holy Name of Jesus Parish, South Deerfield
Holy Trinity, Webster
St. Casimir, Lowell
St. Joseph, Westfield
St. Valentine, Northampton