| | Sherman, IL | Rockport, TX | United States |
| Population | 4,061 | 10,264 | 329,725,481 |
| Female Population | 56.2% | 48.6% | 50.5% |
| Male Population | 43.8% | 51.4% | 49.5% |
| Median Age | 46.3 | 51.4 | 38.4 |
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| Population - 2010 | 4,173 | 10,044 | 309,327,143 |
| Population - 2000 | 2,871 | 7,385 | 285,036,114 |
| Population - 1990 | 2,080 | 4,753 | 251,960,433 |
| Pop. 2000 to Now | 62.3% | 46.9% | 15.6% |
| Pop. 1990 to Now | 124.0% | 128.2% | 30.8% |
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| Population Density | 1,272.6 | 621.1 | 93.4 |
| Land Area | 3.2 | 16.5 | 3,531,905.4 |
| Water Area | 0.0 | 4.6 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Sherman, IL | Rockport, TX | United States |
| Age 0 to 4 | 3.2% | 5.5% | 5.9% |
| Age 5 to 9 | 3.6% | 4.4% | 6.1% |
| Age 10 to 14 | 7.2% | 2.1% | 6.6% |
| Age 15 to 17 | 5.4% | 4.7% | 3.9% |
| Age 18 to 20 | 3.2% | 2.2% | 4.0% |
| Age 21 to 24 | 3.5% | 4.4% | 5.2% |
| Age 25 to 34 | 11.9% | 12.2% | 13.8% |
| Age 35 to 44 | 9.8% | 8.9% | 12.9% |
| Age 45 to 54 | 21.5% | 10.0% | 12.6% |
| Age 55 to 59 | 3.4% | 11.1% | 6.7% |
| Age 60 to 64 | 5.5% | 6.2% | 6.3% |
| Age 65 to 74 | 13.9% | 18.2% | 9.6% |
| Age 75 to 84 | 4.9% | 7.6% | 4.5% |
| Age 85 and over | 3.2% | 2.5% | 1.9% |
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| Race | | | |
| | Sherman, IL | Rockport, TX | United States |
| White | 87.8% | 69.5% | 59.4% |
| Black | 6.6% | 0.4% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.3% | 0.9% | 3.2% |
| Hispanic | 4.3% | 29.1% | 18.4% |
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| Marriage & Family | | | |
| | Sherman, IL | Rockport, TX | United States |
| Married Population | 61.3% | 49.4% | 49.8% |
| Currently Married | 60.9% | 49.2% | 48.0% |
| Married but Separated | 0.4% | 0.3% | 1.8% |
| Single Population | 38.7% | 50.6% | 50.2% |
| Never Married | 21.4% | 28.2% | 33.8% |
| Divorced | 8.6% | 16.4% | 10.8% |
| Widowed | 8.7% | 6.0% | 5.6% |
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| Household Size | 2.51 | 2.26 | 2.60 |
| Households | 1,572 | 4,415 | 124,010,992 |
| Family Households | 1,155 | 2,758 | 80,755,759 |
| Married couple, w/children | 41.0% | 13.0% | 30.5% |
| Married couple, no children | 46.1% | 63.7% | 42.9% |
| Non Family Households | 417 | 1,657 | 43,255,233 |
| Single householder, w/children | 3.3% | 16.5% | 15.8% |
| Single householder, no children | 9.6% | 6.8% | 10.8% |