| | St. Helens, OR | Coos Bay, OR | United States |
| Population | 13,808 | 15,921 | 329,725,481 |
| Female Population | 51.0% | 50.8% | 50.5% |
| Male Population | 49.0% | 49.2% | 49.5% |
| Median Age | 36.6 | 41.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 13,050 | 15,990 | 309,327,143 |
| Population - 2000 | 10,019 | 15,374 | 285,036,114 |
| Population - 1990 | 7,535 | 15,076 | 251,960,433 |
| Pop. 2000 to Now | 40.4% | 6.3% | 15.6% |
| Pop. 1990 to Now | 86.7% | 8.4% | 30.8% |
| space4 | | | |
| Population Density | 2,885.7 | 1,498.2 | 93.4 |
| Land Area | 4.8 | 10.6 | 3,531,905.4 |
| Water Area | 1.1 | 5.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | St. Helens, OR | Coos Bay, OR | United States |
| Age 0 to 4 | 7.7% | 8.0% | 5.9% |
| Age 5 to 9 | 6.0% | 4.9% | 6.1% |
| Age 10 to 14 | 5.0% | 4.2% | 6.6% |
| Age 15 to 17 | 4.7% | 2.7% | 3.9% |
| Age 18 to 20 | 3.0% | 4.2% | 4.0% |
| Age 21 to 24 | 4.7% | 4.8% | 5.2% |
| Age 25 to 34 | 16.4% | 14.1% | 13.8% |
| Age 35 to 44 | 11.8% | 10.3% | 12.9% |
| Age 45 to 54 | 12.6% | 10.3% | 12.6% |
| Age 55 to 59 | 7.9% | 8.4% | 6.7% |
| Age 60 to 64 | 7.3% | 5.7% | 6.3% |
| Age 65 to 74 | 8.1% | 12.6% | 9.6% |
| Age 75 to 84 | 2.7% | 7.0% | 4.5% |
| Age 85 and over | 1.9% | 2.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | St. Helens, OR | Coos Bay, OR | United States |
| White | 84.4% | 83.6% | 59.4% |
| Black | 0.5% | 0.8% | 12.2% |
| Asian | 0.6% | 1.3% | 5.6% |
| Native American | 0.3% | 1.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.0% | 0.2% |
| Other | 0.6% | 0.2% | 0.4% |
| Two or More Races | 6.0% | 5.2% | 3.2% |
| Hispanic | 7.4% | 7.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | St. Helens, OR | Coos Bay, OR | United States |
| Married Population | 42.1% | 38.6% | 49.8% |
| Currently Married | 41.2% | 37.2% | 48.0% |
| Married but Separated | 0.9% | 1.4% | 1.8% |
| Single Population | 57.9% | 61.4% | 50.2% |
| Never Married | 33.0% | 33.7% | 33.8% |
| Divorced | 18.2% | 20.1% | 10.8% |
| Widowed | 6.7% | 7.6% | 5.6% |
| space5 | | | |
| Household Size | 2.66 | 2.23 | 2.60 |
| Households | 5,060 | 7,049 | 124,010,992 |
| Family Households | 3,428 | 3,656 | 80,755,759 |
| Married couple, w/children | 27.5% | 20.2% | 30.5% |
| Married couple, no children | 35.6% | 43.5% | 42.9% |
| Non Family Households | 1,632 | 3,393 | 43,255,233 |
| Single householder, w/children | 24.8% | 21.8% | 15.8% |
| Single householder, no children | 12.2% | 14.5% | 10.8% |