| Statistic | Mount Pleasant | St. Louis | Missouri |
| Population | 3,978 | 315,543 | 6,326,040 |
| Population density (sq mi) | 6,689 | 5,093 | 92 |
| Median age | 42.7 | 36.0 | 38.3 |
| Male/Female ratio | 0.9:1 | 0.9:1 | 1.0:1 |
| Married (15yrs & older) | n/a | 38% | 57% |
| Families w/ Kids under 18 | 54% | 42% | 42% |
| Speak English | n/a | 90% | 94% |
| Speak Spanish | n/a | 3% | 3% |

| Race | Mount Pleasant | St. Louis | Missouri |
| White | 59.22% | 46.44% | 82.53% |
| Black | 29.80% | 45.66% | 11.58% |
| Asian | 0.42% | 3.37% | 1.78% |
| American Indian | 0.08% | 0.26% | 0.42% |
| Native Hawaiian | 0.00% | 0.04% | 0.11% |
| Mixed race | 6.37% | 3.10% | 2.44% |
| Other race | 4.11% | 1.13% | 1.13% |