| | Harrisburg, SD | Port Orford, OR | United States |
| Population | 6,645 | 873 | 329,725,481 |
| Female Population | 49.2% | 46.9% | 50.5% |
| Male Population | 50.8% | 53.2% | 49.5% |
| Median Age | 29.1 | 62.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,184 | 1,135 | 309,327,143 |
| Population - 2000 | 958 | 1,153 | 285,036,114 |
| Population - 1990 | 727 | 1,025 | 251,960,433 |
| Pop. 2000 to Now | 643.8% | 1.6% | 15.6% |
| Pop. 1990 to Now | 880.2% | 14.2% | 30.8% |
| space4 | | | |
| Population Density | 2,082.4 | 560.3 | 93.4 |
| Land Area | 3.2 | 1.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Harrisburg, SD | Port Orford, OR | United States |
| Age 0 to 4 | 10.3% | 0.6% | 5.9% |
| Age 5 to 9 | 10.5% | 1.7% | 6.1% |
| Age 10 to 14 | 12.1% | 0.0% | 6.6% |
| Age 15 to 17 | 4.0% | 0.0% | 3.9% |
| Age 18 to 20 | 0.7% | 5.8% | 4.0% |
| Age 21 to 24 | 4.1% | 2.7% | 5.2% |
| Age 25 to 34 | 21.2% | 6.2% | 13.8% |
| Age 35 to 44 | 17.3% | 5.0% | 12.9% |
| Age 45 to 54 | 11.4% | 8.5% | 12.6% |
| Age 55 to 59 | 4.7% | 11.8% | 6.7% |
| Age 60 to 64 | 1.2% | 13.3% | 6.3% |
| Age 65 to 74 | 1.4% | 25.9% | 9.6% |
| Age 75 to 84 | 0.8% | 14.3% | 4.5% |
| Age 85 and over | 0.0% | 4.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Harrisburg, SD | Port Orford, OR | United States |
| White | 94.4% | 95.6% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.2% | 5.6% |
| Native American | 0.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 3.3% | 3.3% | 3.2% |
| Hispanic | 2.2% | 0.8% | 18.4% |
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| Marriage & Family | | | |
| | Harrisburg, SD | Port Orford, OR | United States |
| Married Population | 65.1% | 45.6% | 49.8% |
| Currently Married | 64.1% | 43.7% | 48.0% |
| Married but Separated | 1.0% | 1.9% | 1.8% |
| Single Population | 34.9% | 54.4% | 50.2% |
| Never Married | 26.5% | 32.9% | 33.8% |
| Divorced | 6.7% | 13.8% | 10.8% |
| Widowed | 1.7% | 7.6% | 5.6% |
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| Household Size | 2.84 | 1.49 | 2.60 |
| Households | 2,341 | 581 | 124,010,992 |
| Family Households | 1,905 | 203 | 80,755,759 |
| Married couple, w/children | 53.1% | 0.0% | 30.5% |
| Married couple, no children | 22.6% | 87.7% | 42.9% |
| Non Family Households | 436 | 378 | 43,255,233 |
| Single householder, w/children | 18.6% | 8.4% | 15.8% |
| Single householder, no children | 5.7% | 3.9% | 10.8% |