| | Mercerville, NJ | Lawrence township (Mercer County), NJ | United States |
| Percent Religious | 52.9% | 52.9% | 49.4% |
| Baptist | 2.6% | 2.6% | 8.2% |
| Episcopalian | 1.7% | 1.7% | 0.6% |
| Catholic | 33.9% | 33.9% | 19.7% |
| Church of Jesus Christ | 0.4% | 0.4% | 2.1% |
| Lutheran | 1.1% | 1.1% | 2.4% |
| Pentecostal | 1.2% | 1.2% | 1.9% |
| Methodist | 2.1% | 2.1% | 4.0% |
| Presbyterian | 2.3% | 2.3% | 1.7% |
| Other Christian | 3.3% | 3.3% | 6.7% |
| Judaism | 2.2% | 2.2% | 0.7% |
| Eastern | 0.4% | 0.4% | 0.5% |
| Islam | 1.4% | 1.4% | 0.9% |