| | Marlow, OK | Newcastle, OK | United States |
| Population | 4,387 | 10,970 | 329,725,481 |
| Female Population | 49.1% | 51.7% | 50.5% |
| Male Population | 50.9% | 48.3% | 49.5% |
| Median Age | 39.3 | 38.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,669 | 7,756 | 309,327,143 |
| Population - 2000 | 4,592 | 5,434 | 285,036,114 |
| Population - 1990 | 4,416 | 4,214 | 251,960,433 |
| Pop. 2000 to Now | -3.8% | 108.8% | 15.6% |
| Pop. 1990 to Now | 0.0% | 169.3% | 30.8% |
| space4 | | | |
| Population Density | 629.4 | 183.4 | 93.4 |
| Land Area | 7.0 | 59.8 | 3,531,905.4 |
| Water Area | 0.1 | 1.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Marlow, OK | Newcastle, OK | United States |
| Age 0 to 4 | 7.2% | 5.6% | 5.9% |
| Age 5 to 9 | 7.5% | 8.7% | 6.1% |
| Age 10 to 14 | 6.8% | 7.4% | 6.6% |
| Age 15 to 17 | 4.0% | 4.1% | 3.9% |
| Age 18 to 20 | 2.9% | 2.6% | 4.0% |
| Age 21 to 24 | 3.9% | 4.1% | 5.2% |
| Age 25 to 34 | 10.4% | 12.8% | 13.8% |
| Age 35 to 44 | 12.1% | 13.6% | 12.9% |
| Age 45 to 54 | 13.4% | 11.1% | 12.6% |
| Age 55 to 59 | 5.5% | 7.8% | 6.7% |
| Age 60 to 64 | 5.0% | 7.0% | 6.3% |
| Age 65 to 74 | 10.9% | 8.2% | 9.6% |
| Age 75 to 84 | 4.6% | 5.9% | 4.5% |
| Age 85 and over | 5.8% | 0.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Marlow, OK | Newcastle, OK | United States |
| White | 83.5% | 82.7% | 59.4% |
| Black | 0.2% | 1.2% | 12.2% |
| Asian | 0.1% | 0.0% | 5.6% |
| Native American | 6.2% | 4.6% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 5.3% | 6.2% | 3.2% |
| Hispanic | 4.7% | 5.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Marlow, OK | Newcastle, OK | United States |
| Married Population | 51.6% | 67.4% | 49.8% |
| Currently Married | 49.9% | 66.3% | 48.0% |
| Married but Separated | 1.7% | 1.0% | 1.8% |
| Single Population | 48.4% | 32.6% | 50.2% |
| Never Married | 20.0% | 18.6% | 33.8% |
| Divorced | 18.0% | 9.1% | 10.8% |
| Widowed | 10.4% | 5.0% | 5.6% |
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| Household Size | 2.56 | 2.68 | 2.60 |
| Households | 1,673 | 4,092 | 124,010,992 |
| Family Households | 1,086 | 3,159 | 80,755,759 |
| Married couple, w/children | 34.0% | 38.2% | 30.5% |
| Married couple, no children | 40.9% | 47.8% | 42.9% |
| Non Family Households | 587 | 933 | 43,255,233 |
| Single householder, w/children | 16.9% | 10.1% | 15.8% |
| Single householder, no children | 8.3% | 3.8% | 10.8% |