| | Shamrock, TX | Rushville, IL | United States |
| Population | 2,033 | 2,489 | 329,725,481 |
| Female Population | 49.7% | 56.3% | 50.5% |
| Male Population | 50.3% | 43.7% | 49.5% |
| Median Age | 36.7 | 45.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,915 | 3,187 | 309,327,143 |
| Population - 2000 | 2,029 | 3,212 | 285,036,114 |
| Population - 1990 | 2,286 | 3,229 | 251,960,433 |
| Pop. 2000 to Now | -15.2% | -12.1% | 15.6% |
| Pop. 1990 to Now | -24.8% | -12.6% | 30.8% |
| space4 | | | |
| Population Density | 993.2 | 1,506.7 | 93.4 |
| Land Area | 2.0 | 1.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Shamrock, TX | Rushville, IL | United States |
| Age 0 to 4 | 7.0% | 2.9% | 5.9% |
| Age 5 to 9 | 7.3% | 3.1% | 6.1% |
| Age 10 to 14 | 3.6% | 7.2% | 6.6% |
| Age 15 to 17 | 6.0% | 2.5% | 3.9% |
| Age 18 to 20 | 1.8% | 6.5% | 4.0% |
| Age 21 to 24 | 7.5% | 1.6% | 5.2% |
| Age 25 to 34 | 11.5% | 13.5% | 13.8% |
| Age 35 to 44 | 14.2% | 11.6% | 12.9% |
| Age 45 to 54 | 10.5% | 12.5% | 12.6% |
| Age 55 to 59 | 6.1% | 6.6% | 6.7% |
| Age 60 to 64 | 8.3% | 9.4% | 6.3% |
| Age 65 to 74 | 11.3% | 9.6% | 9.6% |
| Age 75 to 84 | 3.2% | 8.2% | 4.5% |
| Age 85 and over | 1.7% | 4.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Shamrock, TX | Rushville, IL | United States |
| White | 61.6% | 94.8% | 59.4% |
| Black | 2.5% | 3.1% | 12.2% |
| Asian | 0.0% | 0.6% | 5.6% |
| Native American | 0.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.0% | 0.4% |
| Two or More Races | 5.9% | 0.8% | 3.2% |
| Hispanic | 29.6% | 0.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Shamrock, TX | Rushville, IL | United States |
| Married Population | 54.3% | 37.1% | 49.8% |
| Currently Married | 53.2% | 35.1% | 48.0% |
| Married but Separated | 1.0% | 2.0% | 1.8% |
| Single Population | 45.7% | 62.9% | 50.2% |
| Never Married | 22.7% | 25.8% | 33.8% |
| Divorced | 17.9% | 23.2% | 10.8% |
| Widowed | 5.2% | 13.9% | 5.6% |
| space5 | | | |
| Household Size | 2.41 | 2.02 | 2.60 |
| Households | 844 | 1,199 | 124,010,992 |
| Family Households | 558 | 546 | 80,755,759 |
| Married couple, w/children | 34.9% | 15.2% | 30.5% |
| Married couple, no children | 35.1% | 50.9% | 42.9% |
| Non Family Households | 286 | 653 | 43,255,233 |
| Single householder, w/children | 24.0% | 23.6% | 15.8% |
| Single householder, no children | 5.9% | 10.3% | 10.8% |