St. Mary Catholic Church is part of the Diocese of Rockford. The Diocese of Rockford covers eleven counties in Northern Illinois.
Below are the official boundaries of St. Mary Catholic Church:
Starting at the intersection of Brookdale Road and Bunker Hill Road: east on Bunker Hill Road to Route 14; southeast on Route 14 to Deepcut Road; northeast on Deepcut Road to Nelson Road; east on Nelson Road to Charles Road; east on Charles Road to Route 47; north on Route 47 to the Hebron/Greenwood township line: east on Thayer Road to Greenwood Road.
Starting at the intersection of Thayer Road and Greenwood Road: south and southwest on Greenwood Road to Route 120; south on Route 120 to Fleming Road: southeast on Fleming Road to Bull Valley Road; east on Bull Valley Road to Cherry Valley Road; southwest on Cherry Valley Road to Mason Hill Road; west on Mason Hill Road to Cherry Valley Road; south on Cherry Valley Road to Crystal Springs Road; west on Crystal Springs Road to Country Club Road; southwest on Country Club Road to McConnell Road; northwest on McConnell Road to Lily Pond Road; south on Lily Pond Road to Route 14; southeast on Route 14 to the Crystal Lake School District 47 boundary line; follow the Crystal Lake School District 47 boundary line to Haligus Road.
Starting at the intersection of the Crystal Lake School District 47 boundary line and Haligus Road: northwest on Haligus Road to Route 176; west on Route 176 to Route 47; northwest on Route 47 to Pleasant Valley Road; west on Pleasant Valley Road to Seneca/Dorr township line; south on the Seneca/Dorr township line to the Seneca/Coral township line (Highbridge Road); west on the Seneca/Coral township line to Union Road.
Starting at the intersection of the Seneca/Coral township line and Union Road; north on Union Road to Garden Valley Road; west on Garden Valley Road to Vermont Road; north on Vermont Road to McKinstry Road; north on McKinstry Road to Dunham Road; west on Dunham Road to Brookdale Road; north on Brookdale Road to Bunker Hill Road.
These parishes are some of the closest parishes to St. Mary, Woodstock. They are all in the McHenry Deanery for the Diocese of Rockford. Some of these are neighboring parishes with schools. The parishes with schools compete in the same athletic conference.