| | Westby, WI | Tomah, WI | United States |
| Population | 2,271 | 9,515 | 329,725,481 |
| Female Population | 51.0% | 46.4% | 50.5% |
| Male Population | 49.1% | 53.6% | 49.5% |
| Median Age | 39 | 41.3 | 38.4 |
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| Population - 2010 | 2,218 | 9,209 | 309,327,143 |
| Population - 2000 | 2,045 | 8,419 | 285,036,114 |
| Population - 1990 | 1,866 | 7,570 | 251,960,433 |
| Pop. 2000 to Now | 10.2% | 11.2% | 15.6% |
| Pop. 1990 to Now | 20.8% | 23.7% | 30.8% |
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| Population Density | 845.5 | 1,240.9 | 93.4 |
| Land Area | 2.7 | 7.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.4 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Westby, WI | Tomah, WI | United States |
| Age 0 to 4 | 8.1% | 6.4% | 5.9% |
| Age 5 to 9 | 7.6% | 6.3% | 6.1% |
| Age 10 to 14 | 8.5% | 5.2% | 6.6% |
| Age 15 to 17 | 2.7% | 2.8% | 3.9% |
| Age 18 to 20 | 1.7% | 2.8% | 4.0% |
| Age 21 to 24 | 3.4% | 4.4% | 5.2% |
| Age 25 to 34 | 13.3% | 13.8% | 13.8% |
| Age 35 to 44 | 9.7% | 14.4% | 12.9% |
| Age 45 to 54 | 12.2% | 10.5% | 12.6% |
| Age 55 to 59 | 7.2% | 8.8% | 6.7% |
| Age 60 to 64 | 4.5% | 5.9% | 6.3% |
| Age 65 to 74 | 10.4% | 9.0% | 9.6% |
| Age 75 to 84 | 6.7% | 5.3% | 4.5% |
| Age 85 and over | 4.0% | 4.3% | 1.9% |
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| Race | | | |
| | Westby, WI | Tomah, WI | United States |
| White | 97.2% | 88.3% | 59.4% |
| Black | 0.1% | 4.0% | 12.2% |
| Asian | 0.5% | 0.6% | 5.6% |
| Native American | 0.0% | 1.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 1.1% | 3.0% | 3.2% |
| Hispanic | 1.1% | 2.5% | 18.4% |
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| Marriage & Family | | | |
| | Westby, WI | Tomah, WI | United States |
| Married Population | 53.9% | 45.9% | 49.8% |
| Currently Married | 52.1% | 44.6% | 48.0% |
| Married but Separated | 1.9% | 1.3% | 1.8% |
| Single Population | 46.1% | 54.1% | 50.2% |
| Never Married | 25.8% | 31.4% | 33.8% |
| Divorced | 15.1% | 14.6% | 10.8% |
| Widowed | 5.1% | 8.1% | 5.6% |
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| Household Size | 2.40 | 2.15 | 2.60 |
| Households | 939 | 4,293 | 124,010,992 |
| Family Households | 507 | 2,181 | 80,755,759 |
| Married couple, w/children | 42.0% | 26.3% | 30.5% |
| Married couple, no children | 40.0% | 45.6% | 42.9% |
| Non Family Households | 432 | 2,112 | 43,255,233 |
| Single householder, w/children | 11.4% | 19.1% | 15.8% |
| Single householder, no children | 6.5% | 9.0% | 10.8% |