| | Erath, LA | Iota, LA | United States |
| Population | 2,160 | 1,463 | 329,725,481 |
| Female Population | 49.6% | 52.0% | 50.5% |
| Male Population | 50.4% | 48.0% | 49.5% |
| Median Age | 34.6 | 29.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,116 | 1,500 | 309,327,143 |
| Population - 2000 | 2,187 | 1,376 | 285,036,114 |
| Population - 1990 | 2,428 | 1,256 | 251,960,433 |
| Pop. 2000 to Now | -7.2% | 3.8% | 15.6% |
| Pop. 1990 to Now | -16.4% | 13.7% | 30.8% |
| space4 | | | |
| Population Density | 1,229.4 | 1,152.0 | 93.4 |
| Land Area | 1.8 | 1.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Erath, LA | Iota, LA | United States |
| Age 0 to 4 | 5.1% | 6.3% | 5.9% |
| Age 5 to 9 | 7.4% | 8.5% | 6.1% |
| Age 10 to 14 | 11.2% | 13.1% | 6.6% |
| Age 15 to 17 | 6.3% | 3.9% | 3.9% |
| Age 18 to 20 | 4.5% | 4.8% | 4.0% |
| Age 21 to 24 | 4.4% | 7.4% | 5.2% |
| Age 25 to 34 | 12.0% | 14.1% | 13.8% |
| Age 35 to 44 | 13.8% | 8.3% | 12.9% |
| Age 45 to 54 | 13.7% | 14.6% | 12.6% |
| Age 55 to 59 | 7.7% | 3.6% | 6.7% |
| Age 60 to 64 | 3.0% | 4.4% | 6.3% |
| Age 65 to 74 | 6.0% | 8.3% | 9.6% |
| Age 75 to 84 | 3.3% | 2.3% | 4.5% |
| Age 85 and over | 1.7% | 0.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Erath, LA | Iota, LA | United States |
| White | 79.1% | 88.5% | 59.4% |
| Black | 8.8% | 2.4% | 12.2% |
| Asian | 3.3% | 1.2% | 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 | 0.0% | 4.6% | 3.2% |
| Hispanic | 8.8% | 3.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Erath, LA | Iota, LA | United States |
| Married Population | 49.8% | 55.1% | 49.8% |
| Currently Married | 44.3% | 51.2% | 48.0% |
| Married but Separated | 5.5% | 3.9% | 1.8% |
| Single Population | 50.2% | 44.9% | 50.2% |
| Never Married | 35.9% | 32.6% | 33.8% |
| Divorced | 10.3% | 7.0% | 10.8% |
| Widowed | 4.0% | 5.3% | 5.6% |
| space5 | | | |
| Household Size | 2.62 | 2.82 | 2.60 |
| Households | 823 | 518 | 124,010,992 |
| Family Households | 600 | 345 | 80,755,759 |
| Married couple, w/children | 39.7% | 37.4% | 30.5% |
| Married couple, no children | 21.2% | 34.2% | 42.9% |
| Non Family Households | 223 | 173 | 43,255,233 |
| Single householder, w/children | 24.8% | 20.9% | 15.8% |
| Single householder, no children | 14.3% | 7.5% | 10.8% |