| | Sidney, NE | Jamestown, NY | United States |
| Population | 6,473 | 28,818 | 329,725,481 |
| Female Population | 50.6% | 50.9% | 50.5% |
| Male Population | 49.4% | 49.2% | 49.5% |
| Median Age | 38.6 | 36.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 6,756 | 31,079 | 309,327,143 |
| Population - 2000 | 6,282 | 31,730 | 285,036,114 |
| Population - 1990 | 5,959 | 34,681 | 251,960,433 |
| Pop. 2000 to Now | -0.8% | -9.0% | 15.6% |
| Pop. 1990 to Now | 4.6% | -16.8% | 30.8% |
| space4 | | | |
| Population Density | 864.8 | 3,225.7 | 93.4 |
| Land Area | 7.5 | 8.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Sidney, NE | Jamestown, NY | United States |
| Age 0 to 4 | 6.3% | 7.4% | 5.9% |
| Age 5 to 9 | 6.9% | 6.9% | 6.1% |
| Age 10 to 14 | 6.5% | 6.3% | 6.6% |
| Age 15 to 17 | 3.7% | 3.6% | 3.9% |
| Age 18 to 20 | 3.5% | 3.4% | 4.0% |
| Age 21 to 24 | 4.4% | 5.1% | 5.2% |
| Age 25 to 34 | 14.3% | 15.0% | 13.8% |
| Age 35 to 44 | 11.7% | 10.9% | 12.9% |
| Age 45 to 54 | 10.4% | 11.6% | 12.6% |
| Age 55 to 59 | 5.3% | 6.5% | 6.7% |
| Age 60 to 64 | 8.0% | 6.7% | 6.3% |
| Age 65 to 74 | 10.6% | 9.1% | 9.6% |
| Age 75 to 84 | 5.3% | 4.4% | 4.5% |
| Age 85 and over | 3.2% | 3.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Sidney, NE | Jamestown, NY | United States |
| White | 85.9% | 82.3% | 59.4% |
| Black | 1.2% | 2.5% | 12.2% |
| Asian | 0.8% | 0.2% | 5.6% |
| Native American | 1.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.5% | 0.0% | 0.2% |
| Other | 0.2% | 0.1% | 0.4% |
| Two or More Races | 0.9% | 4.1% | 3.2% |
| Hispanic | 9.6% | 10.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Sidney, NE | Jamestown, NY | United States |
| Married Population | 47.1% | 36.4% | 49.8% |
| Currently Married | 46.5% | 33.5% | 48.0% |
| Married but Separated | 0.6% | 2.9% | 1.8% |
| Single Population | 52.9% | 63.6% | 50.2% |
| Never Married | 25.5% | 42.2% | 33.8% |
| Divorced | 18.1% | 14.7% | 10.8% |
| Widowed | 9.2% | 6.7% | 5.6% |
| space5 | | | |
| Household Size | 2.14 | 2.29 | 2.60 |
| Households | 2,975 | 12,313 | 124,010,992 |
| Family Households | 1,475 | 6,374 | 80,755,759 |
| Married couple, w/children | 30.8% | 22.1% | 30.5% |
| Married couple, no children | 45.2% | 32.0% | 42.9% |
| Non Family Households | 1,500 | 5,939 | 43,255,233 |
| Single householder, w/children | 14.4% | 31.1% | 15.8% |
| Single householder, no children | 9.6% | 14.8% | 10.8% |