| RELIGION | San Buenaventura (Ventura) | Quincy | United States |
| Percent Religious | 44.82% | 22.46% | 48.78% |
| Catholic | 28.45% | 6.08% | 19.43% |
| LDS | 2.48% | 3.77% | 2.03% |
| Baptist | 1.86% | 2.65% | 9.30% |
| Episcopalian | 0.30% | 0.27% | 0.63% |
| Pentacostal | 1.30% | 2.08% | 1.87% |
| Lutheran | 1.49% | 1.10% | 2.33% |
| Methodist | 1.05% | 3.25% | 3.93% |
| Presbyterian | 0.72% | 0.00% | 1.63% |
| Other Christian | 5.26% | 3.26% | 5.51% |
| Jewish | 0.66% | 0.00% | 0.73% |
| Eastern | 0.83% | 0.00% | 0.53% |
| Islam | 0.42% | 0.00% | 0.84% |
