| | Shannon City, IA | Lenox, IA | United States |
| Population | 98 | 1,483 | 329,725,481 |
| Female Population | 33.7% | 55.6% | 50.5% |
| Male Population | 66.3% | 44.4% | 49.5% |
| Median Age | 34.6 | 39.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 73 | 1,410 | 309,327,143 |
| Population - 2000 | 70 | 1,401 | 285,036,114 |
| Population - 1990 | 97 | 1,303 | 251,960,433 |
| Pop. 2000 to Now | -1.4% | -1.1% | 15.6% |
| Pop. 1990 to Now | -28.9% | 6.4% | 30.8% |
| space4 | | | |
| Population Density | 237.9 | 749.4 | 93.4 |
| Land Area | 0.4 | 2.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Shannon City, IA | Lenox, IA | United States |
| Age 0 to 4 | 4.1% | 4.3% | 5.9% |
| Age 5 to 9 | 2.0% | 7.4% | 6.1% |
| Age 10 to 14 | 5.1% | 12.5% | 6.6% |
| Age 15 to 17 | 21.4% | 4.2% | 3.9% |
| Age 18 to 20 | 0.0% | 4.7% | 4.0% |
| Age 21 to 24 | 0.0% | 2.2% | 5.2% |
| Age 25 to 34 | 20.4% | 8.6% | 13.8% |
| Age 35 to 44 | 12.2% | 12.3% | 12.9% |
| Age 45 to 54 | 15.3% | 14.2% | 12.6% |
| Age 55 to 59 | 7.1% | 5.3% | 6.7% |
| Age 60 to 64 | 7.1% | 5.2% | 6.3% |
| Age 65 to 74 | 3.1% | 9.2% | 9.6% |
| Age 75 to 84 | 2.0% | 4.3% | 4.5% |
| Age 85 and over | 0.0% | 5.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Shannon City, IA | Lenox, IA | United States |
| White | 70.4% | 67.9% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 2.4% | 0.4% |
| Two or More Races | 0.0% | 1.4% | 3.2% |
| Hispanic | 29.6% | 28.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Shannon City, IA | Lenox, IA | United States |
| Married Population | 44.8% | 55.0% | 49.8% |
| Currently Married | 44.8% | 52.6% | 48.0% |
| Married but Separated | 0.0% | 2.4% | 1.8% |
| Single Population | 55.2% | 45.0% | 50.2% |
| Never Married | 37.9% | 24.0% | 33.8% |
| Divorced | 16.1% | 11.5% | 10.8% |
| Widowed | 1.1% | 9.5% | 5.6% |
| space5 | | | |
| Household Size | 3.06 | 2.65 | 2.60 |
| Households | 32 | 550 | 124,010,992 |
| Family Households | 26 | 317 | 80,755,759 |
| Married couple, w/children | 34.6% | 34.7% | 30.5% |
| Married couple, no children | 34.6% | 43.8% | 42.9% |
| Non Family Households | 6 | 233 | 43,255,233 |
| Single householder, w/children | 30.8% | 11.4% | 15.8% |
| Single householder, no children | 0.0% | 10.1% | 10.8% |