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.