| | Peculiar, MO | Harrisonville, MO | United States |
| Population | 5,559 | 10,070 | 329,725,481 |
| Female Population | 47.7% | 51.9% | 50.5% |
| Male Population | 52.3% | 48.2% | 49.5% |
| Median Age | 36.3 | 37.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,638 | 10,037 | 309,327,143 |
| Population - 2000 | 2,604 | 8,946 | 285,036,114 |
| Population - 1990 | 1,777 | 7,683 | 251,960,433 |
| Pop. 2000 to Now | 117.4% | 12.7% | 15.6% |
| Pop. 1990 to Now | 218.5% | 31.3% | 30.8% |
| space4 | | | |
| Population Density | 613.2 | 1,018.9 | 93.4 |
| Land Area | 9.1 | 9.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Peculiar, MO | Harrisonville, MO | United States |
| Age 0 to 4 | 6.2% | 8.1% | 5.9% |
| Age 5 to 9 | 8.7% | 5.1% | 6.1% |
| Age 10 to 14 | 5.0% | 6.8% | 6.6% |
| Age 15 to 17 | 5.4% | 2.9% | 3.9% |
| Age 18 to 20 | 1.3% | 3.7% | 4.0% |
| Age 21 to 24 | 6.2% | 6.9% | 5.2% |
| Age 25 to 34 | 15.3% | 12.3% | 13.8% |
| Age 35 to 44 | 14.7% | 12.9% | 12.9% |
| Age 45 to 54 | 16.0% | 9.6% | 12.6% |
| Age 55 to 59 | 7.9% | 9.5% | 6.7% |
| Age 60 to 64 | 3.5% | 6.6% | 6.3% |
| Age 65 to 74 | 4.2% | 8.5% | 9.6% |
| Age 75 to 84 | 4.8% | 4.1% | 4.5% |
| Age 85 and over | 0.8% | 3.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Peculiar, MO | Harrisonville, MO | United States |
| White | 85.5% | 93.7% | 59.4% |
| Black | 2.8% | 0.7% | 12.2% |
| Asian | 0.0% | 0.1% | 5.6% |
| Native American | 0.0% | 0.9% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.2% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 4.0% | 2.2% | 3.2% |
| Hispanic | 7.7% | 2.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Peculiar, MO | Harrisonville, MO | United States |
| Married Population | 47.8% | 46.3% | 49.8% |
| Currently Married | 44.7% | 41.7% | 48.0% |
| Married but Separated | 3.1% | 4.6% | 1.8% |
| Single Population | 52.2% | 53.7% | 50.2% |
| Never Married | 32.0% | 28.2% | 33.8% |
| Divorced | 8.8% | 18.1% | 10.8% |
| Widowed | 11.3% | 7.4% | 5.6% |
| space5 | | | |
| Household Size | 2.68 | 2.44 | 2.60 |
| Households | 2,076 | 3,986 | 124,010,992 |
| Family Households | 1,408 | 2,431 | 80,755,759 |
| Married couple, w/children | 32.6% | 30.9% | 30.5% |
| Married couple, no children | 34.8% | 33.1% | 42.9% |
| Non Family Households | 668 | 1,555 | 43,255,233 |
| Single householder, w/children | 20.3% | 19.3% | 15.8% |
| Single householder, no children | 12.3% | 16.7% | 10.8% |