| | Rockford, MI | Jenison, MI | United States |
| Population | 6,131 | 17,570 | 329,725,481 |
| Female Population | 49.9% | 52.4% | 50.5% |
| Male Population | 50.1% | 47.6% | 49.5% |
| Median Age | 36.5 | 38.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,711 | 17,236 | 309,327,143 |
| Population - 2000 | 4,626 | 17,211 | 285,036,114 |
| Population - 1990 | 3,750 | 17,882 | 251,960,433 |
| Pop. 2000 to Now | 38.2% | 8.2% | 15.6% |
| Pop. 1990 to Now | 70.5% | 4.2% | 30.8% |
| space4 | | | |
| Population Density | 1,901.7 | 3,000.9 | 93.4 |
| Land Area | 3.2 | 5.9 | 3,531,905.4 |
| Water Area | 0.1 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Rockford, MI | Jenison, MI | United States |
| Age 0 to 4 | 6.3% | 7.2% | 5.9% |
| Age 5 to 9 | 7.7% | 7.6% | 6.1% |
| Age 10 to 14 | 6.9% | 5.8% | 6.6% |
| Age 15 to 17 | 3.3% | 4.7% | 3.9% |
| Age 18 to 20 | 2.6% | 2.1% | 4.0% |
| Age 21 to 24 | 4.1% | 4.4% | 5.2% |
| Age 25 to 34 | 15.3% | 12.7% | 13.8% |
| Age 35 to 44 | 13.6% | 12.6% | 12.9% |
| Age 45 to 54 | 14.0% | 8.9% | 12.6% |
| Age 55 to 59 | 4.6% | 4.3% | 6.7% |
| Age 60 to 64 | 10.7% | 7.6% | 6.3% |
| Age 65 to 74 | 8.4% | 9.8% | 9.6% |
| Age 75 to 84 | 2.7% | 6.5% | 4.5% |
| Age 85 and over | 0.0% | 5.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Rockford, MI | Jenison, MI | United States |
| White | 91.6% | 92.7% | 59.4% |
| Black | 2.4% | 0.9% | 12.2% |
| Asian | 0.3% | 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% | 2.1% | 3.2% |
| Hispanic | 3.2% | 3.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Rockford, MI | Jenison, MI | United States |
| Married Population | 57.4% | 65.1% | 49.8% |
| Currently Married | 55.4% | 64.8% | 48.0% |
| Married but Separated | 2.1% | 0.3% | 1.8% |
| Single Population | 42.6% | 34.9% | 50.2% |
| Never Married | 25.4% | 18.7% | 33.8% |
| Divorced | 15.1% | 6.7% | 10.8% |
| Widowed | 2.1% | 9.5% | 5.6% |
| space5 | | | |
| Household Size | 2.40 | 2.55 | 2.60 |
| Households | 2,542 | 6,874 | 124,010,992 |
| Family Households | 1,664 | 4,924 | 80,755,759 |
| Married couple, w/children | 35.3% | 41.2% | 30.5% |
| Married couple, no children | 45.4% | 47.7% | 42.9% |
| Non Family Households | 878 | 1,950 | 43,255,233 |
| Single householder, w/children | 13.7% | 5.5% | 15.8% |
| Single householder, no children | 5.6% | 5.6% | 10.8% |