| | Lafayette, IN | Lake Bluff, IL | United States |
| Population | 70,928 | 5,878 | 329,725,481 |
| Female Population | 50.1% | 54.1% | 50.5% |
| Male Population | 49.9% | 45.9% | 49.5% |
| Median Age | 32.5 | 46.7 | 38.4 |
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| Population - 2010 | 68,926 | 5,687 | 309,327,143 |
| Population - 2000 | 56,397 | 6,056 | 285,036,114 |
| Population - 1990 | 43,764 | 5,513 | 251,960,433 |
| Pop. 2000 to Now | 26.8% | -8.8% | 15.6% |
| Pop. 1990 to Now | 63.3% | 0.2% | 30.8% |
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| Population Density | 2,414.3 | 1,442.5 | 93.4 |
| Land Area | 29.4 | 4.1 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Lafayette, IN | Lake Bluff, IL | United States |
| Age 0 to 4 | 7.8% | 6.0% | 5.9% |
| Age 5 to 9 | 6.3% | 4.6% | 6.1% |
| Age 10 to 14 | 6.1% | 8.4% | 6.6% |
| Age 15 to 17 | 3.2% | 5.9% | 3.9% |
| Age 18 to 20 | 3.3% | 4.4% | 4.0% |
| Age 21 to 24 | 9.2% | 2.3% | 5.2% |
| Age 25 to 34 | 18.0% | 6.2% | 13.8% |
| Age 35 to 44 | 13.0% | 9.3% | 12.9% |
| Age 45 to 54 | 9.6% | 15.4% | 12.6% |
| Age 55 to 59 | 4.9% | 7.7% | 6.7% |
| Age 60 to 64 | 5.3% | 9.9% | 6.3% |
| Age 65 to 74 | 7.9% | 12.7% | 9.6% |
| Age 75 to 84 | 3.8% | 5.8% | 4.5% |
| Age 85 and over | 1.5% | 1.4% | 1.9% |
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| Race | | | |
| | Lafayette, IN | Lake Bluff, IL | United States |
| White | 73.4% | 84.2% | 59.4% |
| Black | 8.7% | 0.0% | 12.2% |
| Asian | 1.8% | 6.3% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.5% | 0.0% | 0.4% |
| Two or More Races | 2.5% | 1.9% | 3.2% |
| Hispanic | 13.0% | 7.5% | 18.4% |
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| Marriage & Family | | | |
| | Lafayette, IN | Lake Bluff, IL | United States |
| Married Population | 42.3% | 70.8% | 49.8% |
| Currently Married | 40.4% | 69.7% | 48.0% |
| Married but Separated | 1.9% | 1.0% | 1.8% |
| Single Population | 57.7% | 29.2% | 50.2% |
| Never Married | 38.0% | 19.5% | 33.8% |
| Divorced | 14.5% | 5.7% | 10.8% |
| Widowed | 5.2% | 4.0% | 5.6% |
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| Household Size | 2.22 | 2.73 | 2.60 |
| Households | 31,362 | 2,150 | 124,010,992 |
| Family Households | 16,889 | 1,766 | 80,755,759 |
| Married couple, w/children | 24.3% | 42.7% | 30.5% |
| Married couple, no children | 39.4% | 49.1% | 42.9% |
| Non Family Households | 14,473 | 384 | 43,255,233 |
| Single householder, w/children | 24.5% | 4.0% | 15.8% |
| Single householder, no children | 11.8% | 4.2% | 10.8% |