| | New London, IA | Kirby, WY | United States |
| Population | 2,535 | 48 | 329,725,481 |
| Female Population | 55.2% | 29.2% | 50.5% |
| Male Population | 44.8% | 70.8% | 49.5% |
| Median Age | 33.6 | 52.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,892 | 92 | 309,327,143 |
| Population - 2000 | 1,937 | 57 | 285,036,114 |
| Population - 1990 | 1,922 | 59 | 251,960,433 |
| Pop. 2000 to Now | -5.8% | 47.4% | 15.6% |
| Pop. 1990 to Now | -5.1% | 42.4% | 30.8% |
| space4 | | | |
| Population Density | 2,519.9 | 313.7 | 93.4 |
| Land Area | 1.0 | 0.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | New London, IA | Kirby, WY | United States |
| Age 0 to 4 | 7.8% | 0.0% | 5.9% |
| Age 5 to 9 | 7.1% | 0.0% | 6.1% |
| Age 10 to 14 | 8.3% | 0.0% | 6.6% |
| Age 15 to 17 | 4.6% | 0.0% | 3.9% |
| Age 18 to 20 | 5.4% | 0.0% | 4.0% |
| Age 21 to 24 | 6.9% | 14.6% | 5.2% |
| Age 25 to 34 | 11.3% | 18.8% | 13.8% |
| Age 35 to 44 | 11.4% | 2.1% | 12.9% |
| Age 45 to 54 | 15.3% | 16.7% | 12.6% |
| Age 55 to 59 | 3.9% | 0.0% | 6.7% |
| Age 60 to 64 | 4.2% | 6.3% | 6.3% |
| Age 65 to 74 | 6.9% | 29.2% | 9.6% |
| Age 75 to 84 | 3.7% | 8.3% | 4.5% |
| Age 85 and over | 3.1% | 4.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | New London, IA | Kirby, WY | United States |
| White | 95.7% | 79.2% | 59.4% |
| Black | 0.5% | 0.0% | 12.2% |
| Asian | 0.5% | 0.0% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.8% | 6.3% | 3.2% |
| Hispanic | 2.3% | 14.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | New London, IA | Kirby, WY | United States |
| Married Population | 46.3% | 72.9% | 49.8% |
| Currently Married | 43.3% | 72.9% | 48.0% |
| Married but Separated | 3.0% | 0.0% | 1.8% |
| Single Population | 53.7% | 27.1% | 50.2% |
| Never Married | 32.2% | 0.0% | 33.8% |
| Divorced | 17.1% | 14.6% | 10.8% |
| Widowed | 4.4% | 12.5% | 5.6% |
| space5 | | | |
| Household Size | 2.90 | 1.66 | 2.60 |
| Households | 865 | 29 | 124,010,992 |
| Family Households | 570 | 16 | 80,755,759 |
| Married couple, w/children | 37.4% | 0.0% | 30.5% |
| Married couple, no children | 32.5% | 100.0% | 42.9% |
| Non Family Households | 295 | 13 | 43,255,233 |
| Single householder, w/children | 19.6% | 0.0% | 15.8% |
| Single householder, no children | 10.5% | 0.0% | 10.8% |