| | Plainwell, MI | Grandville, MI | United States |
| Population | 3,773 | 16,043 | 329,725,481 |
| Female Population | 52.6% | 48.9% | 50.5% |
| Male Population | 47.4% | 51.1% | 49.5% |
| Median Age | 39.2 | 36.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,805 | 15,377 | 309,327,143 |
| Population - 2000 | 3,933 | 16,263 | 285,036,114 |
| Population - 1990 | 4,057 | 15,624 | 251,960,433 |
| Pop. 2000 to Now | -4.0% | -3.2% | 15.6% |
| Pop. 1990 to Now | -7.0% | 0.8% | 30.8% |
| space4 | | | |
| Population Density | 1,894.1 | 2,213.7 | 93.4 |
| Land Area | 2.0 | 7.2 | 3,531,905.4 |
| Water Area | 0.1 | 0.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Plainwell, MI | Grandville, MI | United States |
| Age 0 to 4 | 2.9% | 6.7% | 5.9% |
| Age 5 to 9 | 4.4% | 6.5% | 6.1% |
| Age 10 to 14 | 10.1% | 6.1% | 6.6% |
| Age 15 to 17 | 1.9% | 3.2% | 3.9% |
| Age 18 to 20 | 4.9% | 2.8% | 4.0% |
| Age 21 to 24 | 5.4% | 6.2% | 5.2% |
| Age 25 to 34 | 13.5% | 17.3% | 13.8% |
| Age 35 to 44 | 17.4% | 11.1% | 12.9% |
| Age 45 to 54 | 9.5% | 9.2% | 12.6% |
| Age 55 to 59 | 6.9% | 7.9% | 6.7% |
| Age 60 to 64 | 6.3% | 6.2% | 6.3% |
| Age 65 to 74 | 11.3% | 11.1% | 9.6% |
| Age 75 to 84 | 4.2% | 3.0% | 4.5% |
| Age 85 and over | 1.3% | 2.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Plainwell, MI | Grandville, MI | United States |
| White | 89.5% | 88.1% | 59.4% |
| Black | 1.3% | 2.5% | 12.2% |
| Asian | 0.3% | 1.8% | 5.6% |
| Native American | 0.1% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.0% | 0.4% |
| Two or More Races | 1.7% | 3.1% | 3.2% |
| Hispanic | 6.9% | 4.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Plainwell, MI | Grandville, MI | United States |
| Married Population | 51.1% | 58.2% | 49.8% |
| Currently Married | 50.9% | 57.9% | 48.0% |
| Married but Separated | 0.2% | 0.3% | 1.8% |
| Single Population | 48.9% | 41.8% | 50.2% |
| Never Married | 28.6% | 26.8% | 33.8% |
| Divorced | 15.2% | 11.0% | 10.8% |
| Widowed | 5.2% | 3.9% | 5.6% |
| space5 | | | |
| Household Size | 2.48 | 2.40 | 2.60 |
| Households | 1,455 | 6,591 | 124,010,992 |
| Family Households | 1,093 | 4,559 | 80,755,759 |
| Married couple, w/children | 19.2% | 26.9% | 30.5% |
| Married couple, no children | 45.7% | 53.6% | 42.9% |
| Non Family Households | 362 | 2,032 | 43,255,233 |
| Single householder, w/children | 29.8% | 13.6% | 15.8% |
| Single householder, no children | 5.2% | 5.9% | 10.8% |