| | Newhall, IA | Dakota City, IA | United States |
| Population | 1,150 | 929 | 329,725,481 |
| Female Population | 53.0% | 49.3% | 50.5% |
| Male Population | 47.0% | 50.7% | 49.5% |
| Median Age | 35.1 | 38.5 | 38.4 |
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| Population - 2010 | 895 | 837 | 309,327,143 |
| Population - 2000 | 886 | 911 | 285,036,114 |
| Population - 1990 | 854 | 1,024 | 251,960,433 |
| Pop. 2000 to Now | -4.5% | -10.9% | 15.6% |
| Pop. 1990 to Now | -0.9% | -20.7% | 30.8% |
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| Population Density | 3,808.0 | 1,260.5 | 93.4 |
| Land Area | 0.3 | 0.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Newhall, IA | Dakota City, IA | United States |
| Age 0 to 4 | 11.9% | 10.8% | 5.9% |
| Age 5 to 9 | 7.2% | 4.7% | 6.1% |
| Age 10 to 14 | 5.6% | 8.2% | 6.6% |
| Age 15 to 17 | 6.0% | 7.5% | 3.9% |
| Age 18 to 20 | 4.0% | 1.3% | 4.0% |
| Age 21 to 24 | 4.0% | 3.6% | 5.2% |
| Age 25 to 34 | 11.0% | 8.8% | 13.8% |
| Age 35 to 44 | 12.4% | 16.1% | 12.9% |
| Age 45 to 54 | 12.3% | 8.5% | 12.6% |
| Age 55 to 59 | 4.2% | 7.4% | 6.7% |
| Age 60 to 64 | 5.7% | 8.0% | 6.3% |
| Age 65 to 74 | 10.2% | 7.5% | 9.6% |
| Age 75 to 84 | 4.2% | 5.7% | 4.5% |
| Age 85 and over | 1.3% | 1.8% | 1.9% |
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| Race | | | |
| | Newhall, IA | Dakota City, IA | United States |
| White | 95.1% | 91.0% | 59.4% |
| Black | 1.6% | 0.2% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 5.6% | 0.2% |
| Other | 0.0% | 0.8% | 0.4% |
| Two or More Races | 2.4% | 0.0% | 3.2% |
| Hispanic | 0.5% | 2.5% | 18.4% |
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| Marriage & Family | | | |
| | Newhall, IA | Dakota City, IA | United States |
| Married Population | 52.1% | 54.3% | 49.8% |
| Currently Married | 50.0% | 53.2% | 48.0% |
| Married but Separated | 2.1% | 1.1% | 1.8% |
| Single Population | 47.9% | 45.7% | 50.2% |
| Never Married | 28.6% | 26.8% | 33.8% |
| Divorced | 12.1% | 12.8% | 10.8% |
| Widowed | 7.2% | 6.1% | 5.6% |
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| Household Size | 2.56 | 2.53 | 2.60 |
| Households | 449 | 367 | 124,010,992 |
| Family Households | 279 | 244 | 80,755,759 |
| Married couple, w/children | 38.7% | 27.5% | 30.5% |
| Married couple, no children | 38.7% | 47.1% | 42.9% |
| Non Family Households | 170 | 123 | 43,255,233 |
| Single householder, w/children | 18.3% | 17.6% | 15.8% |
| Single householder, no children | 4.3% | 7.8% | 10.8% |