| | Lansing, KS | Merriam, KS | United States |
| Population | 11,321 | 11,110 | 329,725,481 |
| Female Population | 40.4% | 49.3% | 50.5% |
| Male Population | 59.7% | 50.7% | 49.5% |
| Median Age | 37.3 | 38.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 11,307 | 11,028 | 309,327,143 |
| Population - 2000 | 9,199 | 11,008 | 285,036,114 |
| Population - 1990 | 7,120 | 11,821 | 251,960,433 |
| Pop. 2000 to Now | 30.0% | 1.1% | 15.6% |
| Pop. 1990 to Now | 67.9% | -5.9% | 30.8% |
| space4 | | | |
| Population Density | 960.2 | 2,573.6 | 93.4 |
| Land Area | 11.8 | 4.3 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Lansing, KS | Merriam, KS | United States |
| Age 0 to 4 | 5.2% | 4.4% | 5.9% |
| Age 5 to 9 | 5.0% | 5.2% | 6.1% |
| Age 10 to 14 | 7.3% | 3.8% | 6.6% |
| Age 15 to 17 | 4.2% | 5.1% | 3.9% |
| Age 18 to 20 | 3.1% | 3.6% | 4.0% |
| Age 21 to 24 | 6.1% | 5.2% | 5.2% |
| Age 25 to 34 | 15.9% | 18.4% | 13.8% |
| Age 35 to 44 | 14.7% | 11.2% | 12.9% |
| Age 45 to 54 | 14.4% | 11.0% | 12.6% |
| Age 55 to 59 | 6.7% | 9.2% | 6.7% |
| Age 60 to 64 | 5.0% | 5.8% | 6.3% |
| Age 65 to 74 | 8.5% | 9.9% | 9.6% |
| Age 75 to 84 | 2.5% | 5.1% | 4.5% |
| Age 85 and over | 1.3% | 2.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Lansing, KS | Merriam, KS | United States |
| White | 70.2% | 79.1% | 59.4% |
| Black | 14.2% | 7.2% | 12.2% |
| Asian | 0.6% | 2.3% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.5% | 0.3% | 0.4% |
| Two or More Races | 5.9% | 2.5% | 3.2% |
| Hispanic | 8.4% | 8.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Lansing, KS | Merriam, KS | United States |
| Married Population | 48.2% | 42.8% | 49.8% |
| Currently Married | 46.9% | 41.5% | 48.0% |
| Married but Separated | 1.2% | 1.3% | 1.8% |
| Single Population | 51.8% | 57.2% | 50.2% |
| Never Married | 36.5% | 39.0% | 33.8% |
| Divorced | 10.7% | 13.7% | 10.8% |
| Widowed | 4.6% | 4.5% | 5.6% |
| space5 | | | |
| Household Size | 2.88 | 2.10 | 2.60 |
| Households | 3,266 | 5,223 | 124,010,992 |
| Family Households | 2,505 | 2,437 | 80,755,759 |
| Married couple, w/children | 41.4% | 31.7% | 30.5% |
| Married couple, no children | 38.3% | 45.5% | 42.9% |
| Non Family Households | 761 | 2,786 | 43,255,233 |
| Single householder, w/children | 15.1% | 15.4% | 15.8% |
| Single householder, no children | 5.2% | 7.4% | 10.8% |