| | Northbridge, MA | Lawrence, MA | United States |
| Population | 16,291 | 87,798 | 329,725,481 |
| Female Population | 51.1% | 50.2% | 50.5% |
| Male Population | 48.9% | 49.8% | 49.5% |
| Median Age | 41.6 | 32.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 15,722 | 76,552 | 309,327,143 |
| Population - 2000 | 13,182 | 72,043 | 285,036,114 |
| Population - 1990 | 13,371 | 70,207 | 251,960,433 |
| Pop. 2000 to Now | 26.1% | 11.1% | 15.6% |
| Pop. 1990 to Now | 24.3% | 14.0% | 30.8% |
| space4 | | | |
| Population Density | 943.4 | 12,667.4 | 93.4 |
| Land Area | 17.3 | 6.9 | 3,531,905.4 |
| Water Area | 0.8 | 0.5 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Northbridge, MA | Lawrence, MA | United States |
| Age 0 to 4 | 6.3% | 7.9% | 5.9% |
| Age 5 to 9 | 5.7% | 7.2% | 6.1% |
| Age 10 to 14 | 6.5% | 7.7% | 6.6% |
| Age 15 to 17 | 3.5% | 4.5% | 3.9% |
| Age 18 to 20 | 3.1% | 4.6% | 4.0% |
| Age 21 to 24 | 4.1% | 6.2% | 5.2% |
| Age 25 to 34 | 12.7% | 16.6% | 13.8% |
| Age 35 to 44 | 12.6% | 13.3% | 12.9% |
| Age 45 to 54 | 16.9% | 11.4% | 12.6% |
| Age 55 to 59 | 6.2% | 5.9% | 6.7% |
| Age 60 to 64 | 6.9% | 4.6% | 6.3% |
| Age 65 to 74 | 10.0% | 5.9% | 9.6% |
| Age 75 to 84 | 3.5% | 2.7% | 4.5% |
| Age 85 and over | 2.1% | 1.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Northbridge, MA | Lawrence, MA | United States |
| White | 84.3% | 13.2% | 59.4% |
| Black | 1.5% | 1.9% | 12.2% |
| Asian | 0.2% | 1.7% | 5.6% |
| Native American | 0.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.0% | 0.2% |
| Other | 0.7% | 0.6% | 0.4% |
| Two or More Races | 2.0% | 0.4% | 3.2% |
| Hispanic | 11.1% | 82.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Northbridge, MA | Lawrence, MA | United States |
| Married Population | 54.7% | 38.5% | 49.8% |
| Currently Married | 54.0% | 34.1% | 48.0% |
| Married but Separated | 0.7% | 4.4% | 1.8% |
| Single Population | 45.3% | 61.5% | 50.2% |
| Never Married | 29.1% | 46.4% | 33.8% |
| Divorced | 9.7% | 10.9% | 10.8% |
| Widowed | 6.6% | 4.2% | 5.6% |
| space5 | | | |
| Household Size | 2.52 | 2.86 | 2.60 |
| Households | 6,364 | 30,291 | 124,010,992 |
| Family Households | 4,467 | 20,801 | 80,755,759 |
| Married couple, w/children | 32.5% | 23.3% | 30.5% |
| Married couple, no children | 44.1% | 22.6% | 42.9% |
| Non Family Households | 1,897 | 9,490 | 43,255,233 |
| Single householder, w/children | 16.0% | 35.5% | 15.8% |
| Single householder, no children | 7.5% | 18.7% | 10.8% |