| | Julian, PA | Centre Hall, PA | United States |
| Population | 201 | 1,496 | 329,725,481 |
| Female Population | 45.8% | 51.6% | 50.5% |
| Male Population | 54.2% | 48.4% | 49.5% |
| Median Age | 40.2 | 47.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 133 | 1,251 | 309,327,143 |
| Population - 2000 | 152 | 1,079 | 285,036,114 |
| Population - 1990 | 113 | 1,203 | 251,960,433 |
| Pop. 2000 to Now | 2.6% | 12.7% | 15.6% |
| Pop. 1990 to Now | 38.1% | 1.1% | 30.8% |
| space4 | | | |
| Population Density | 1,358.1 | 2,409.0 | 93.4 |
| Land Area | 0.1 | 0.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Julian, PA | Centre Hall, PA | United States |
| Age 0 to 4 | 2.5% | 3.6% | 5.9% |
| Age 5 to 9 | 3.0% | 4.7% | 6.1% |
| Age 10 to 14 | 3.0% | 8.0% | 6.6% |
| Age 15 to 17 | 6.0% | 6.6% | 3.9% |
| Age 18 to 20 | 26.4% | 0.9% | 4.0% |
| Age 21 to 24 | 2.0% | 2.4% | 5.2% |
| Age 25 to 34 | 0.0% | 9.9% | 13.8% |
| Age 35 to 44 | 26.9% | 10.1% | 12.9% |
| Age 45 to 54 | 5.5% | 23.1% | 12.6% |
| Age 55 to 59 | 1.5% | 7.0% | 6.7% |
| Age 60 to 64 | 7.5% | 5.7% | 6.3% |
| Age 65 to 74 | 8.5% | 9.8% | 9.6% |
| Age 75 to 84 | 7.5% | 6.8% | 4.5% |
| Age 85 and over | 0.0% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Julian, PA | Centre Hall, PA | United States |
| White | 100.0% | 96.8% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 3.2% | 3.2% |
| Hispanic | 0.0% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Julian, PA | Centre Hall, PA | United States |
| Married Population | 38.6% | 49.6% | 49.8% |
| Currently Married | 38.6% | 47.4% | 48.0% |
| Married but Separated | 0.0% | 2.2% | 1.8% |
| Single Population | 61.4% | 50.4% | 50.2% |
| Never Married | 46.7% | 27.6% | 33.8% |
| Divorced | 8.2% | 16.1% | 10.8% |
| Widowed | 6.5% | 6.8% | 5.6% |
| space5 | | | |
| Household Size | 3.24 | 2.33 | 2.60 |
| Households | 62 | 643 | 124,010,992 |
| Family Households | 39 | 453 | 80,755,759 |
| Married couple, w/children | 17.9% | 22.7% | 30.5% |
| Married couple, no children | 56.4% | 42.6% | 42.9% |
| Non Family Households | 23 | 190 | 43,255,233 |
| Single householder, w/children | 10.3% | 22.3% | 15.8% |
| Single householder, no children | 15.4% | 12.4% | 10.8% |