| | Middletown, NJ | Penobscot, ME | United States |
| Population | 67,007 | 1,144 | 329,725,481 |
| Female Population | 49.5% | 54.6% | 50.5% |
| Male Population | 50.5% | 45.4% | 49.5% |
| Median Age | 44.6 | 52.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 66,536 | 1,262 | 309,327,143 |
| Population - 2000 | 66,327 | 1,344 | 285,036,114 |
| Population - 1990 | 68,183 | 1,131 | 251,960,433 |
| Pop. 2000 to Now | -1.7% | -9.2% | 15.6% |
| Pop. 1990 to Now | -4.4% | 7.9% | 30.8% |
| space4 | | | |
| Population Density | 1,635.1 | 28.7 | 93.4 |
| Land Area | 41.0 | 39.9 | 3,531,905.4 |
| Water Area | 17.8 | 6.7 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Middletown, NJ | Penobscot, ME | United States |
| Age 0 to 4 | 5.1% | 1.6% | 5.9% |
| Age 5 to 9 | 5.3% | 5.3% | 6.1% |
| Age 10 to 14 | 6.2% | 5.2% | 6.6% |
| Age 15 to 17 | 5.3% | 3.5% | 3.9% |
| Age 18 to 20 | 3.3% | 1.1% | 4.0% |
| Age 21 to 24 | 4.4% | 3.8% | 5.2% |
| Age 25 to 34 | 9.0% | 4.1% | 13.8% |
| Age 35 to 44 | 12.0% | 12.0% | 12.9% |
| Age 45 to 54 | 15.9% | 16.3% | 12.6% |
| Age 55 to 59 | 7.6% | 6.1% | 6.7% |
| Age 60 to 64 | 8.3% | 8.1% | 6.3% |
| Age 65 to 74 | 10.9% | 21.9% | 9.6% |
| Age 75 to 84 | 4.7% | 6.0% | 4.5% |
| Age 85 and over | 2.1% | 4.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Middletown, NJ | Penobscot, ME | United States |
| White | 87.6% | 94.0% | 59.4% |
| Black | 1.3% | 0.0% | 12.2% |
| Asian | 2.9% | 0.9% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.4% | 0.4% |
| Two or More Races | 1.8% | 1.9% | 3.2% |
| Hispanic | 6.2% | 2.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Middletown, NJ | Penobscot, ME | United States |
| Married Population | 58.5% | 50.8% | 49.8% |
| Currently Married | 57.7% | 49.7% | 48.0% |
| Married but Separated | 0.8% | 1.1% | 1.8% |
| Single Population | 41.5% | 49.2% | 50.2% |
| Never Married | 27.3% | 18.3% | 33.8% |
| Divorced | 8.3% | 19.4% | 10.8% |
| Widowed | 5.9% | 11.5% | 5.6% |
| space5 | | | |
| Household Size | 2.70 | 2.18 | 2.60 |
| Households | 24,761 | 524 | 124,010,992 |
| Family Households | 18,469 | 302 | 80,755,759 |
| Married couple, w/children | 36.8% | 16.2% | 30.5% |
| Married couple, no children | 46.9% | 64.9% | 42.9% |
| Non Family Households | 6,292 | 222 | 43,255,233 |
| Single householder, w/children | 6.4% | 10.3% | 15.8% |
| Single householder, no children | 9.9% | 8.6% | 10.8% |