| | Griswold, IA | Shenandoah, IA | United States |
| Population | 1,081 | 4,874 | 329,725,481 |
| Female Population | 49.1% | 49.9% | 50.5% |
| Male Population | 50.9% | 50.1% | 49.5% |
| Median Age | 44.8 | 41.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,037 | 5,134 | 309,327,143 |
| Population - 2000 | 1,039 | 5,546 | 285,036,114 |
| Population - 1990 | 1,049 | 5,572 | 251,960,433 |
| Pop. 2000 to Now | -9.4% | -13.8% | 15.6% |
| Pop. 1990 to Now | -10.3% | -14.2% | 30.8% |
| space4 | | | |
| Population Density | 1,740.7 | 1,300.8 | 93.4 |
| Land Area | 0.6 | 3.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Griswold, IA | Shenandoah, IA | United States |
| Age 0 to 4 | 5.3% | 6.1% | 5.9% |
| Age 5 to 9 | 4.5% | 6.0% | 6.1% |
| Age 10 to 14 | 8.3% | 7.9% | 6.6% |
| Age 15 to 17 | 9.6% | 2.7% | 3.9% |
| Age 18 to 20 | 2.9% | 2.7% | 4.0% |
| Age 21 to 24 | 2.2% | 3.1% | 5.2% |
| Age 25 to 34 | 9.4% | 11.9% | 13.8% |
| Age 35 to 44 | 8.0% | 13.4% | 12.9% |
| Age 45 to 54 | 12.1% | 8.0% | 12.6% |
| Age 55 to 59 | 4.9% | 6.7% | 6.7% |
| Age 60 to 64 | 10.3% | 7.7% | 6.3% |
| Age 65 to 74 | 8.7% | 12.7% | 9.6% |
| Age 75 to 84 | 6.8% | 6.8% | 4.5% |
| Age 85 and over | 6.9% | 4.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Griswold, IA | Shenandoah, IA | United States |
| White | 89.6% | 91.3% | 59.4% |
| Black | 0.0% | 0.8% | 12.2% |
| Asian | 0.0% | 0.1% | 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 | 6.3% | 3.5% | 3.2% |
| Hispanic | 4.1% | 4.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Griswold, IA | Shenandoah, IA | United States |
| Married Population | 50.5% | 50.5% | 49.8% |
| Currently Married | 49.8% | 48.9% | 48.0% |
| Married but Separated | 0.7% | 1.5% | 1.8% |
| Single Population | 49.5% | 49.5% | 50.2% |
| Never Married | 28.4% | 25.5% | 33.8% |
| Divorced | 11.3% | 15.1% | 10.8% |
| Widowed | 9.8% | 8.9% | 5.6% |
| space5 | | | |
| Household Size | 2.36 | 2.26 | 2.60 |
| Households | 446 | 2,112 | 124,010,992 |
| Family Households | 259 | 1,155 | 80,755,759 |
| Married couple, w/children | 26.6% | 31.1% | 30.5% |
| Married couple, no children | 53.7% | 49.1% | 42.9% |
| Non Family Households | 187 | 957 | 43,255,233 |
| Single householder, w/children | 17.8% | 18.5% | 15.8% |
| Single householder, no children | 1.9% | 1.3% | 10.8% |