| | Platea, PA | Cochranton, PA | United States |
| Population | 470 | 1,024 | 329,725,481 |
| Female Population | 47.5% | 49.8% | 50.5% |
| Male Population | 52.6% | 50.2% | 49.5% |
| Median Age | 56.8 | 49.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 430 | 1,134 | 309,327,143 |
| Population - 2000 | 474 | 1,148 | 285,036,114 |
| Population - 1990 | 467 | 1,174 | 251,960,433 |
| Pop. 2000 to Now | -16.2% | -7.4% | 15.6% |
| Pop. 1990 to Now | -15.0% | -9.5% | 30.8% |
| space4 | | | |
| Population Density | 140.6 | 855.5 | 93.4 |
| Land Area | 3.3 | 1.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Platea, PA | Cochranton, PA | United States |
| Age 0 to 4 | 4.9% | 2.6% | 5.9% |
| Age 5 to 9 | 5.3% | 7.5% | 6.1% |
| Age 10 to 14 | 4.7% | 9.6% | 6.6% |
| Age 15 to 17 | 1.1% | 4.1% | 3.9% |
| Age 18 to 20 | 0.4% | 2.3% | 4.0% |
| Age 21 to 24 | 3.2% | 0.7% | 5.2% |
| Age 25 to 34 | 8.5% | 8.0% | 13.8% |
| Age 35 to 44 | 9.6% | 12.1% | 12.9% |
| Age 45 to 54 | 10.0% | 11.1% | 12.6% |
| Age 55 to 59 | 10.0% | 9.9% | 6.7% |
| Age 60 to 64 | 16.2% | 8.9% | 6.3% |
| Age 65 to 74 | 16.2% | 13.0% | 9.6% |
| Age 75 to 84 | 7.4% | 6.0% | 4.5% |
| Age 85 and over | 2.6% | 4.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Platea, PA | Cochranton, PA | United States |
| White | 97.2% | 93.3% | 59.4% |
| Black | 0.0% | 1.2% | 12.2% |
| Asian | 0.0% | 0.5% | 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 | 0.4% | 3.5% | 3.2% |
| Hispanic | 2.3% | 1.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Platea, PA | Cochranton, PA | United States |
| Married Population | 68.5% | 62.0% | 49.8% |
| Currently Married | 67.5% | 56.1% | 48.0% |
| Married but Separated | 1.0% | 6.0% | 1.8% |
| Single Population | 31.5% | 38.0% | 50.2% |
| Never Married | 14.5% | 19.6% | 33.8% |
| Divorced | 8.3% | 12.5% | 10.8% |
| Widowed | 8.8% | 5.8% | 5.6% |
| space5 | | | |
| Household Size | 2.40 | 2.46 | 2.60 |
| Households | 196 | 417 | 124,010,992 |
| Family Households | 161 | 281 | 80,755,759 |
| Married couple, w/children | 18.0% | 25.3% | 30.5% |
| Married couple, no children | 65.8% | 56.6% | 42.9% |
| Non Family Households | 35 | 136 | 43,255,233 |
| Single householder, w/children | 6.8% | 12.5% | 15.8% |
| Single householder, no children | 9.3% | 5.7% | 10.8% |