| | Lehigh township, KS | Newton, KS | United States |
| Population | 388 | 18,576 | 329,725,481 |
| Female Population | 45.1% | 49.0% | 50.5% |
| Male Population | 54.9% | 51.0% | 49.5% |
| Median Age | 35.4 | 39 | 38.4 |
| space3 | | | |
| Population - 2010 | 329 | 19,142 | 309,327,143 |
| Population - 2000 | 370 | 17,190 | 285,036,114 |
| Population - 1990 | 311 | 16,700 | 251,960,433 |
| Pop. 2000 to Now | -16.2% | 9.0% | 15.6% |
| Pop. 1990 to Now | -0.3% | 12.2% | 30.8% |
| space4 | | | |
| Population Density | 10.8 | 1,296.1 | 93.4 |
| Land Area | 36.0 | 14.3 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Lehigh township, KS | Newton, KS | United States |
| Age 0 to 4 | 6.7% | 5.8% | 5.9% |
| Age 5 to 9 | 7.7% | 5.9% | 6.1% |
| Age 10 to 14 | 15.5% | 6.5% | 6.6% |
| Age 15 to 17 | 4.4% | 4.5% | 3.9% |
| Age 18 to 20 | 1.3% | 3.8% | 4.0% |
| Age 21 to 24 | 0.0% | 5.5% | 5.2% |
| Age 25 to 34 | 13.7% | 13.5% | 13.8% |
| Age 35 to 44 | 13.4% | 11.3% | 12.9% |
| Age 45 to 54 | 13.7% | 11.6% | 12.6% |
| Age 55 to 59 | 10.1% | 6.9% | 6.7% |
| Age 60 to 64 | 2.8% | 7.2% | 6.3% |
| Age 65 to 74 | 8.8% | 9.4% | 9.6% |
| Age 75 to 84 | 2.1% | 6.4% | 4.5% |
| Age 85 and over | 0.0% | 1.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Lehigh township, KS | Newton, KS | United States |
| White | 95.6% | 74.2% | 59.4% |
| Black | 1.5% | 2.6% | 12.2% |
| Asian | 0.0% | 0.3% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 4.0% | 3.2% |
| Hispanic | 2.8% | 18.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Lehigh township, KS | Newton, KS | United States |
| Married Population | 62.9% | 50.6% | 49.8% |
| Currently Married | 62.9% | 50.0% | 48.0% |
| Married but Separated | 0.0% | 0.6% | 1.8% |
| Single Population | 37.1% | 49.4% | 50.2% |
| Never Married | 20.2% | 27.8% | 33.8% |
| Divorced | 15.8% | 14.7% | 10.8% |
| Widowed | 1.1% | 6.9% | 5.6% |
| space5 | | | |
| Household Size | 3.29 | 2.48 | 2.60 |
| Households | 118 | 7,316 | 124,010,992 |
| Family Households | 96 | 4,970 | 80,755,759 |
| Married couple, w/children | 59.4% | 33.0% | 30.5% |
| Married couple, no children | 27.1% | 42.5% | 42.9% |
| Non Family Households | 22 | 2,346 | 43,255,233 |
| Single householder, w/children | 13.5% | 16.0% | 15.8% |
| Single householder, no children | 0.0% | 8.6% | 10.8% |