| | Letts, IA | Durant, IA | United States |
| Population | 347 | 1,829 | 329,725,481 |
| Female Population | 48.4% | 51.8% | 50.5% |
| Male Population | 51.6% | 48.2% | 49.5% |
| Median Age | 41.2 | 42.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 383 | 1,868 | 309,327,143 |
| Population - 2000 | 392 | 1,677 | 285,036,114 |
| Population - 1990 | 390 | 1,549 | 251,960,433 |
| Pop. 2000 to Now | -4.9% | 10.7% | 15.6% |
| Pop. 1990 to Now | -4.4% | 19.9% | 30.8% |
| space4 | | | |
| Population Density | 592.2 | 1,485.8 | 93.4 |
| Land Area | 0.6 | 1.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Letts, IA | Durant, IA | United States |
| Age 0 to 4 | 4.0% | 4.0% | 5.9% |
| Age 5 to 9 | 8.4% | 6.7% | 6.1% |
| Age 10 to 14 | 6.3% | 7.1% | 6.6% |
| Age 15 to 17 | 5.8% | 5.4% | 3.9% |
| Age 18 to 20 | 0.9% | 2.5% | 4.0% |
| Age 21 to 24 | 3.5% | 3.1% | 5.2% |
| Age 25 to 34 | 15.9% | 12.6% | 13.8% |
| Age 35 to 44 | 10.7% | 14.2% | 12.9% |
| Age 45 to 54 | 10.7% | 13.8% | 12.6% |
| Age 55 to 59 | 6.9% | 5.1% | 6.7% |
| Age 60 to 64 | 10.1% | 8.9% | 6.3% |
| Age 65 to 74 | 9.5% | 7.7% | 9.6% |
| Age 75 to 84 | 6.9% | 6.0% | 4.5% |
| Age 85 and over | 0.6% | 2.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Letts, IA | Durant, IA | United States |
| White | 93.1% | 93.8% | 59.4% |
| Black | 0.3% | 0.9% | 12.2% |
| Asian | 0.0% | 1.7% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 6.1% | 2.0% | 3.2% |
| Hispanic | 0.6% | 1.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Letts, IA | Durant, IA | United States |
| Married Population | 51.8% | 57.2% | 49.8% |
| Currently Married | 51.1% | 56.2% | 48.0% |
| Married but Separated | 0.7% | 1.0% | 1.8% |
| Single Population | 48.2% | 42.8% | 50.2% |
| Never Married | 26.6% | 23.2% | 33.8% |
| Divorced | 13.1% | 12.5% | 10.8% |
| Widowed | 8.5% | 7.1% | 5.6% |
| space5 | | | |
| Household Size | 2.84 | 2.46 | 2.60 |
| Households | 122 | 743 | 124,010,992 |
| Family Households | 83 | 475 | 80,755,759 |
| Married couple, w/children | 45.8% | 29.1% | 30.5% |
| Married couple, no children | 36.1% | 53.7% | 42.9% |
| Non Family Households | 39 | 268 | 43,255,233 |
| Single householder, w/children | 7.2% | 13.3% | 15.8% |
| Single householder, no children | 10.8% | 4.0% | 10.8% |