| | Nodaway, IA | Clarinda, IA | United States |
| Population | 57 | 5,498 | 329,725,481 |
| Female Population | 52.6% | 41.6% | 50.5% |
| Male Population | 47.4% | 58.4% | 49.5% |
| Median Age | 55.3 | 39.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 114 | 5,573 | 309,327,143 |
| Population - 2000 | 132 | 5,690 | 285,036,114 |
| Population - 1990 | 153 | 5,104 | 251,960,433 |
| Pop. 2000 to Now | -22.7% | -5.7% | 15.6% |
| Pop. 1990 to Now | -33.3% | 5.1% | 30.8% |
| space4 | | | |
| Population Density | 106.5 | 1,060.0 | 93.4 |
| Land Area | 0.5 | 5.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Nodaway, IA | Clarinda, IA | United States |
| Age 0 to 4 | 8.8% | 5.5% | 5.9% |
| Age 5 to 9 | 5.3% | 3.5% | 6.1% |
| Age 10 to 14 | 3.5% | 5.6% | 6.6% |
| Age 15 to 17 | 1.8% | 6.9% | 3.9% |
| Age 18 to 20 | 0.0% | 2.3% | 4.0% |
| Age 21 to 24 | 8.8% | 5.4% | 5.2% |
| Age 25 to 34 | 8.8% | 14.6% | 13.8% |
| Age 35 to 44 | 5.3% | 14.6% | 12.9% |
| Age 45 to 54 | 7.0% | 11.2% | 12.6% |
| Age 55 to 59 | 10.5% | 7.2% | 6.7% |
| Age 60 to 64 | 8.8% | 5.5% | 6.3% |
| Age 65 to 74 | 26.3% | 9.5% | 9.6% |
| Age 75 to 84 | 5.3% | 4.0% | 4.5% |
| Age 85 and over | 0.0% | 4.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Nodaway, IA | Clarinda, IA | United States |
| White | 98.2% | 84.0% | 59.4% |
| Black | 0.0% | 4.1% | 12.2% |
| Asian | 0.0% | 2.3% | 5.6% |
| Native American | 0.0% | 0.7% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.8% | 4.5% | 3.2% |
| Hispanic | 0.0% | 4.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Nodaway, IA | Clarinda, IA | United States |
| Married Population | 61.7% | 41.3% | 49.8% |
| Currently Married | 61.7% | 40.6% | 48.0% |
| Married but Separated | 0.0% | 0.7% | 1.8% |
| Single Population | 38.3% | 58.7% | 50.2% |
| Never Married | 14.9% | 37.5% | 33.8% |
| Divorced | 14.9% | 13.9% | 10.8% |
| Widowed | 8.5% | 7.3% | 5.6% |
| space5 | | | |
| Household Size | 2.28 | 2.35 | 2.60 |
| Households | 25 | 1,937 | 124,010,992 |
| Family Households | 14 | 1,168 | 80,755,759 |
| Married couple, w/children | 28.6% | 27.5% | 30.5% |
| Married couple, no children | 71.4% | 45.5% | 42.9% |
| Non Family Households | 11 | 769 | 43,255,233 |
| Single householder, w/children | 0.0% | 17.3% | 15.8% |
| Single householder, no children | 0.0% | 9.8% | 10.8% |