| Statistic | Mountain Lake | New Jersey | National |
| Population | 565 | 8,882,190 | 328,239,523 |
| Population density (sq mi) | 502 | 1,215 | 91 |
| Median age | 53.6 | 39.5 | 37.7 |
| Male/Female ratio | 1.0:1 | 1.0:1 | 1.0:1 |
| Married (15yrs & older) | 61% | 56% | 55% |
| Families w/ Kids under 18 | 17% | 45% | 43% |
| Speak English | 97% | 69% | 79% |
| Speak Spanish | 2% | 16% | 13% |
| Race | Mountain Lake | New Jersey | National |
| White | 99.12% | 68.15% | 73.35% |
| Black | 0.00% | 13.54% | 12.63% |
| Asian | 0.88% | 9.19% | 5.22% |
| American Indian | 0.00% | 0.21% | 0.82% |
| Native Hawaiian | 0.00% | 0.03% | 0.18% |
| Mixed race | 0.00% | 2.53% | 3.06% |
| Other race | 0.00% | 6.35% | 4.75% |
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