| | Hudson, MA | Lexington, VA | United States |
| Population | 20,032 | 7,287 | 329,725,481 |
| Female Population | 52.3% | 40.6% | 50.5% |
| Male Population | 47.7% | 59.4% | 49.5% |
| Median Age | 43.8 | 22.4 | 38.4 |
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| Population - 2010 | 19,131 | 7,045 | 309,327,143 |
| Population - 2000 | 18,113 | 6,867 | 285,036,114 |
| Population - 1990 | 17,233 | 6,959 | 251,960,433 |
| Pop. 2000 to Now | 8.9% | 6.0% | 15.6% |
| Pop. 1990 to Now | 14.5% | 4.6% | 30.8% |
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| Population Density | 1,738.6 | 2,916.0 | 93.4 |
| Land Area | 11.5 | 2.5 | 3,531,905.4 |
| Water Area | 0.3 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Hudson, MA | Lexington, VA | United States |
| Age 0 to 4 | 5.1% | 3.2% | 5.9% |
| Age 5 to 9 | 5.4% | 1.3% | 6.1% |
| Age 10 to 14 | 5.6% | 1.3% | 6.6% |
| Age 15 to 17 | 4.3% | 2.4% | 3.9% |
| Age 18 to 20 | 2.6% | 29.5% | 4.0% |
| Age 21 to 24 | 4.0% | 18.5% | 5.2% |
| Age 25 to 34 | 11.1% | 10.8% | 13.8% |
| Age 35 to 44 | 13.2% | 5.1% | 12.9% |
| Age 45 to 54 | 13.9% | 6.6% | 12.6% |
| Age 55 to 59 | 7.7% | 2.8% | 6.7% |
| Age 60 to 64 | 7.8% | 4.8% | 6.3% |
| Age 65 to 74 | 10.6% | 8.6% | 9.6% |
| Age 75 to 84 | 6.8% | 3.5% | 4.5% |
| Age 85 and over | 1.9% | 1.6% | 1.9% |
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| Race | | | |
| | Hudson, MA | Lexington, VA | United States |
| White | 83.7% | 80.0% | 59.4% |
| Black | 0.5% | 5.3% | 12.2% |
| Asian | 4.5% | 4.0% | 5.6% |
| Native American | 0.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.0% | 0.2% |
| Other | 0.9% | 0.6% | 0.4% |
| Two or More Races | 3.8% | 4.5% | 3.2% |
| Hispanic | 6.4% | 5.6% | 18.4% |
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| Marriage & Family | | | |
| | Hudson, MA | Lexington, VA | United States |
| Married Population | 56.1% | 27.0% | 49.8% |
| Currently Married | 55.3% | 26.2% | 48.0% |
| Married but Separated | 0.9% | 0.8% | 1.8% |
| Single Population | 43.9% | 73.0% | 50.2% |
| Never Married | 29.2% | 63.6% | 33.8% |
| Divorced | 8.3% | 6.2% | 10.8% |
| Widowed | 6.4% | 3.2% | 5.6% |
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| Household Size | 2.49 | 2.15 | 2.60 |
| Households | 8,035 | 2,005 | 124,010,992 |
| Family Households | 5,298 | 907 | 80,755,759 |
| Married couple, w/children | 33.6% | 32.1% | 30.5% |
| Married couple, no children | 49.4% | 54.9% | 42.9% |
| Non Family Households | 2,737 | 1,098 | 43,255,233 |
| Single householder, w/children | 7.5% | 5.3% | 15.8% |
| Single householder, no children | 9.6% | 7.7% | 10.8% |