Holy Rosary - 1313 A St., Antioch, CA 94509-0231,
925-757-4020 Map
Boundaries: North, San Joaquin River; west, western boundaryof Antioch; east, Willow Ave.; south, Hwy. 4 left of Lone Tree Way to canal.

Immaculate Heart - 813 1st St, Brentwood, CA 94513-1199,
New Location: Corner of Fairview Avenue and Central Blvd.
925-634-4154 Map Increase size of map and move to left.
Boundaries: North, from the junction of extension of Willow Ave. and Lone Tree Rd. to Oakley-Brentwood Hwy., to Sunset Blvd., toBixler Rd., south to point of Timber Rd., west to Byron Hwy, and Hwy. 4, west to S. Sellers to March Creek Rd. to Walnut; south on Walnut and Vasco Rd. to county line, west on Diablo Valley Rd. half way to Concord.

Queen of All Saints - 2390 Grant, Concord. CA 94520,
925-825-0350 Map Links
Boundaries: North, Arnold Industrial Hwy. and Contra Costa Canal east of Willow Pass Rd., southwesterly along Arnold Industrial Hwy. to point where canal crosses highway, just east of city of Martinez; West, at point where canal crosses highway, along canal to southerly limits of city of Martinez, then to the ridge of hill (behind Contra Costa Golf Club) to Golf Club Rd., to extension of this road, to intersection with Walnut Creek (tributary) to intersection of S.P. tracks and Meadow Lane to Monument Blvd., northeasterly to extension of Monument at Rancho Monte del Diablo; East, along Contra Costa Canal to Arnold Industrial Hwy.

St.Agnes -  3966 Chestnut Ave., Concord CA 94518,
925-689-0838 Map 
Boundaries: South, beginning at Rancho Monte del Diablo and northeasterly extension of Monument Court, southeasterly  along the northeastern boundary of the Lime Ridge Open Space to Ygnacio Valley Rd. at Walnut Creek city limit; East, easterly along Ygnacio Valley Rd. from Walnut Creek city limits to Newhall Community Park,   north along park to a southern extension of  BaileyRd., north on Bailey to Myrtle Dr., then on a straight line to summit of Mulligan Hill; West, from Rancho Monte del Diablo opposite extension of Monument Court along Contra Costa Canal to Arnold Industrial Hwy.; North, from Contra Costa Canal along Arnold Industrial to intersection of Willow Pass Rd., then on a straight line to summit of Mulligan Hill.

St. Anne's - Camino Diablo Road & Mc Cabe Rd, Byron, 94513,
925-634-6625 Map
Boundaries: South, Alameda/Contra Costa County line to Vasco Rd. north via Walnut Blvd. to Marsh Creek Rd., to Sellers Ave., to Hwy 4, east to Byron Hwy., north to Sunset Rd., east to San Joaquin/Contra Costa County line, south to Alameda County line, west to Vasco Rd.

St.Anthony - 971 Ohara Ave, Oakley, CA 94561-5785
925 Map
Boundaries: West, going north, from Willow Rd. to San Joaquin River; east, along San Joaquin River to Old River; South, to east end of Sunset Blvd., then west to Hwy. 4; North on Hwy. 4 to Lone Tree Way, west on Lone Tree Way to extension of Willow Ave., then north along cemeteries to San Joaquin River.

St. Bonaventure - 5562 Clayton Rd. Concord 94521,
925-672-5800 Map
Boundaries: East, summit of Mulligan Hill to Marsh Creek Springs; West, from intersection of Ygnacio Valley Rd. and Walnut Creek city limits southeasterly on a straight line to summit of Mount Diablo; South, from Marsh Creek Springs to summit of Mount Diablo; North, easterly along Ygnacio ValleyRd. from Walnut Creek city limits to Newhall CommunityPark, north along park to a southern extension of Bailey Rd., north to Myrtle Dr.,  then on a straight line to summit of Mulligan Hill.
St. Bonaventure's CYO Website

St. Francis - 860 Oak Grove Rd, Concord. Map
Boundaries: East, along ridge of Monte del Diablo to a point marking the extension of Valley Vista Rd.; South, along Valley Vista Rd. to Oak Grove Rd. to Cedro Lane to Wiget Lane, to YgnacioValley Blvd., in a straight line to the end of Ready Rd., to Bancroft Rd.; West, along Bancroft to the rapid transit tracks, to Geary Rd. and Hwy. 680, along the freeway to Monument Blvd.; North to the S.P. railroad tracks, along the tracks to Meadow Lane, to Monument Bld., to Rancho Monte del Diablo Ridge.

St. Ignatius - 3351 Contra Loma Blvd, Antioch, 94509,
925-778-0768 Map
Boundaries: North, Hwy. 4 from intersection with Antioch-Pittsburg city limits at Standard Oil Ave. easterly to Lone Tree Way, south to Contra Costa Canal, then easterly along canal to southern  intersection of the Willow Ave. extension; East, from its intersection with the Contra Costa Canal southerly to Marsh Creek Rd.; South, from its intersection with the Willow Ave. extension of Somersville Rd. from Marsh Creek Rd. to the Contra Costa Canal, then northerly along the canal to Buchanan Rd.; West on Buchanan to Antioch-Pittsburg city limits, north along city limits to Hwy.4.

Our Lady, Queen of the World,  Map
3155 Winterbrook Dr. Bay Point, 94565, 925-458-4718
Boundaries: From the PG&E plant just west of Pittsburg on the SacramentoRiver in a straight line to the top of Mulligan Hill, then in a straight line to the intersection of the Arnold Industrial Hwy. and Willow Pass Rd.,  thence along the highway to Pacheco Creek, then north along Pacheco Creek to the Sacramento River, the back along the Sacremento River to the PG&E plant, west of Pittsburg.

St. Peter Martyr of Verona,  Map
740 Black Diamond St., Pittsburg, 94565, 925-432-4771
Boundaries: From a point on Fwys. 4/24 opposite Los Medanos Station north to San Joaquin River; from Loveridge Rd. west to Shell Oil plant; from a point in the San Joaquin River just west of the PG&E plant in a straight line to Fwys. 4/24.