| | Brewster, KS | Mankato, KS | United States |
| Population | 391 | 954 | 329,725,481 |
| Female Population | 50.6% | 50.0% | 50.5% |
| Male Population | 49.4% | 50.0% | 49.5% |
| Median Age | 27.8 | 47.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 306 | 866 | 309,327,143 |
| Population - 2000 | 285 | 976 | 285,036,114 |
| Population - 1990 | 296 | 1,037 | 251,960,433 |
| Pop. 2000 to Now | 1.4% | -17.6% | 15.6% |
| Pop. 1990 to Now | -2.4% | -22.5% | 30.8% |
| space4 | | | |
| Population Density | 1,515.5 | 978.5 | 93.4 |
| Land Area | 0.3 | 1.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Brewster, KS | Mankato, KS | United States |
| Age 0 to 4 | 22.8% | 5.0% | 5.9% |
| Age 5 to 9 | 6.4% | 7.0% | 6.1% |
| Age 10 to 14 | 2.3% | 8.8% | 6.6% |
| Age 15 to 17 | 0.0% | 6.9% | 3.9% |
| Age 18 to 20 | 3.8% | 0.1% | 4.0% |
| Age 21 to 24 | 7.7% | 2.6% | 5.2% |
| Age 25 to 34 | 21.7% | 6.8% | 13.8% |
| Age 35 to 44 | 10.0% | 9.2% | 12.9% |
| Age 45 to 54 | 7.2% | 10.8% | 12.6% |
| Age 55 to 59 | 3.3% | 9.3% | 6.7% |
| Age 60 to 64 | 4.9% | 8.5% | 6.3% |
| Age 65 to 74 | 4.9% | 11.0% | 9.6% |
| Age 75 to 84 | 2.6% | 7.9% | 4.5% |
| Age 85 and over | 2.6% | 6.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Brewster, KS | Mankato, KS | United States |
| White | 80.6% | 91.7% | 59.4% |
| Black | 0.0% | 0.6% | 12.2% |
| Asian | 0.0% | 0.5% | 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 | 2.6% | 1.4% | 3.2% |
| Hispanic | 16.9% | 5.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Brewster, KS | Mankato, KS | United States |
| Married Population | 76.1% | 54.3% | 49.8% |
| Currently Married | 75.4% | 53.1% | 48.0% |
| Married but Separated | 0.7% | 1.2% | 1.8% |
| Single Population | 23.9% | 45.7% | 50.2% |
| Never Married | 16.4% | 20.8% | 33.8% |
| Divorced | 5.2% | 9.7% | 10.8% |
| Widowed | 2.2% | 15.2% | 5.6% |
| space5 | | | |
| Household Size | 2.88 | 2.50 | 2.60 |
| Households | 136 | 371 | 124,010,992 |
| Family Households | 119 | 209 | 80,755,759 |
| Married couple, w/children | 47.1% | 29.2% | 30.5% |
| Married couple, no children | 35.3% | 60.8% | 42.9% |
| Non Family Households | 17 | 162 | 43,255,233 |
| Single householder, w/children | 11.8% | 5.3% | 15.8% |
| Single householder, no children | 5.9% | 4.8% | 10.8% |