| | Plains, TX | Roswell, NM | United States |
| Population | 1,181 | 48,347 | 329,725,481 |
| Female Population | 52.0% | 50.8% | 50.5% |
| Male Population | 48.0% | 49.2% | 49.5% |
| Median Age | 33.9 | 35.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,477 | 48,466 | 309,327,143 |
| Population - 2000 | 1,450 | 45,293 | 285,036,114 |
| Population - 1990 | 1,422 | 44,654 | 251,960,433 |
| Pop. 2000 to Now | 14.1% | 5.1% | 15.6% |
| Pop. 1990 to Now | 16.4% | 6.6% | 30.8% |
| space4 | | | |
| Population Density | 1,200.2 | 1,627.0 | 93.4 |
| Land Area | 1.0 | 29.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Plains, TX | Roswell, NM | United States |
| Age 0 to 4 | 10.5% | 6.9% | 5.9% |
| Age 5 to 9 | 9.1% | 7.4% | 6.1% |
| Age 10 to 14 | 5.8% | 7.5% | 6.6% |
| Age 15 to 17 | 5.4% | 4.5% | 3.9% |
| Age 18 to 20 | 1.8% | 5.2% | 4.0% |
| Age 21 to 24 | 3.5% | 5.1% | 5.2% |
| Age 25 to 34 | 14.0% | 13.2% | 13.8% |
| Age 35 to 44 | 5.8% | 12.0% | 12.9% |
| Age 45 to 54 | 16.9% | 12.0% | 12.6% |
| Age 55 to 59 | 7.0% | 5.9% | 6.7% |
| Age 60 to 64 | 8.5% | 5.7% | 6.3% |
| Age 65 to 74 | 8.0% | 8.4% | 9.6% |
| Age 75 to 84 | 1.7% | 4.1% | 4.5% |
| Age 85 and over | 2.0% | 2.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Plains, TX | Roswell, NM | United States |
| White | 32.3% | 35.0% | 59.4% |
| Black | 0.0% | 1.6% | 12.2% |
| Asian | 4.1% | 1.3% | 5.6% |
| Native American | 0.0% | 0.7% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 6.5% | 1.0% | 3.2% |
| Hispanic | 57.1% | 59.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Plains, TX | Roswell, NM | United States |
| Married Population | 66.5% | 43.7% | 49.8% |
| Currently Married | 61.9% | 41.5% | 48.0% |
| Married but Separated | 4.7% | 2.2% | 1.8% |
| Single Population | 33.5% | 56.3% | 50.2% |
| Never Married | 19.4% | 35.4% | 33.8% |
| Divorced | 9.2% | 15.0% | 10.8% |
| Widowed | 4.9% | 5.9% | 5.6% |
| space5 | | | |
| Household Size | 2.65 | 2.67 | 2.60 |
| Households | 446 | 17,446 | 124,010,992 |
| Family Households | 383 | 11,406 | 80,755,759 |
| Married couple, w/children | 30.0% | 26.3% | 30.5% |
| Married couple, no children | 44.6% | 35.2% | 42.9% |
| Non Family Households | 63 | 6,040 | 43,255,233 |
| Single householder, w/children | 11.7% | 25.2% | 15.8% |
| Single householder, no children | 13.6% | 13.3% | 10.8% |