| | Ottawa, OH | Glandorf, OH | United States |
| Population | 4,430 | 1,141 | 329,725,481 |
| Female Population | 53.2% | 47.8% | 50.5% |
| Male Population | 46.8% | 52.2% | 49.5% |
| Median Age | 40.5 | 45.6 | 38.4 |
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| Population - 2010 | 4,455 | 1,001 | 309,327,143 |
| Population - 2000 | 4,367 | 919 | 285,036,114 |
| Population - 1990 | 3,999 | 829 | 251,960,433 |
| Pop. 2000 to Now | -1.0% | 12.1% | 15.6% |
| Pop. 1990 to Now | 8.1% | 24.3% | 30.8% |
| space4 | | | |
| Population Density | 974.3 | 697.4 | 93.4 |
| Land Area | 4.5 | 1.6 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Ottawa, OH | Glandorf, OH | United States |
| Age 0 to 4 | 5.4% | 4.8% | 5.9% |
| Age 5 to 9 | 6.7% | 6.4% | 6.1% |
| Age 10 to 14 | 6.0% | 8.2% | 6.6% |
| Age 15 to 17 | 6.2% | 3.2% | 3.9% |
| Age 18 to 20 | 6.1% | 2.8% | 4.0% |
| Age 21 to 24 | 5.7% | 2.5% | 5.2% |
| Age 25 to 34 | 8.5% | 7.6% | 13.8% |
| Age 35 to 44 | 9.3% | 11.7% | 12.9% |
| Age 45 to 54 | 18.5% | 17.8% | 12.6% |
| Age 55 to 59 | 4.4% | 9.5% | 6.7% |
| Age 60 to 64 | 4.4% | 6.4% | 6.3% |
| Age 65 to 74 | 8.5% | 13.2% | 9.6% |
| Age 75 to 84 | 7.0% | 3.2% | 4.5% |
| Age 85 and over | 3.1% | 2.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Ottawa, OH | Glandorf, OH | United States |
| White | 82.2% | 99.5% | 59.4% |
| Black | 0.6% | 0.0% | 12.2% |
| Asian | 0.4% | 0.0% | 5.6% |
| Native American | 0.6% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.3% | 0.0% | 0.4% |
| Two or More Races | 1.8% | 0.5% | 3.2% |
| Hispanic | 13.1% | 0.0% | 18.4% |
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| Marriage & Family | | | |
| | Ottawa, OH | Glandorf, OH | United States |
| Married Population | 49.8% | 63.0% | 49.8% |
| Currently Married | 49.7% | 63.0% | 48.0% |
| Married but Separated | 0.1% | 0.0% | 1.8% |
| Single Population | 50.2% | 37.0% | 50.2% |
| Never Married | 33.7% | 23.0% | 33.8% |
| Divorced | 7.8% | 7.2% | 10.8% |
| Widowed | 8.6% | 6.7% | 5.6% |
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| Household Size | 2.48 | 2.50 | 2.60 |
| Households | 1,767 | 456 | 124,010,992 |
| Family Households | 1,087 | 357 | 80,755,759 |
| Married couple, w/children | 40.4% | 30.3% | 30.5% |
| Married couple, no children | 38.9% | 50.7% | 42.9% |
| Non Family Households | 680 | 99 | 43,255,233 |
| Single householder, w/children | 16.5% | 2.5% | 15.8% |
| Single householder, no children | 4.2% | 16.5% | 10.8% |