| | Tucumcari, NM | San Jon, NM | United States |
| Population | 5,221 | 166 | 329,725,481 |
| Female Population | 53.8% | 41.6% | 50.5% |
| Male Population | 46.2% | 58.4% | 49.5% |
| Median Age | 39.2 | 43.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,380 | 223 | 309,327,143 |
| Population - 2000 | 5,989 | 306 | 285,036,114 |
| Population - 1990 | 6,831 | 277 | 251,960,433 |
| Pop. 2000 to Now | -19.4% | -34.0% | 15.6% |
| Pop. 1990 to Now | -29.3% | -27.1% | 30.8% |
| space4 | | | |
| Population Density | 550.4 | 64.4 | 93.4 |
| Land Area | 9.5 | 2.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Tucumcari, NM | San Jon, NM | United States |
| Age 0 to 4 | 5.5% | 1.8% | 5.9% |
| Age 5 to 9 | 9.2% | 6.0% | 6.1% |
| Age 10 to 14 | 6.1% | 11.4% | 6.6% |
| Age 15 to 17 | 2.8% | 6.6% | 3.9% |
| Age 18 to 20 | 2.2% | 0.0% | 4.0% |
| Age 21 to 24 | 3.5% | 6.6% | 5.2% |
| Age 25 to 34 | 15.8% | 4.8% | 13.8% |
| Age 35 to 44 | 10.3% | 20.5% | 12.9% |
| Age 45 to 54 | 12.0% | 5.4% | 12.6% |
| Age 55 to 59 | 9.7% | 0.6% | 6.7% |
| Age 60 to 64 | 5.3% | 7.8% | 6.3% |
| Age 65 to 74 | 12.4% | 16.9% | 9.6% |
| Age 75 to 84 | 3.6% | 9.6% | 4.5% |
| Age 85 and over | 1.6% | 1.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Tucumcari, NM | San Jon, NM | United States |
| White | 28.6% | 42.2% | 59.4% |
| Black | 2.5% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 1.0% | 10.8% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.4% | 0.6% | 3.2% |
| Hispanic | 65.5% | 46.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Tucumcari, NM | San Jon, NM | United States |
| Married Population | 30.4% | 49.3% | 49.8% |
| Currently Married | 26.3% | 46.3% | 48.0% |
| Married but Separated | 4.1% | 3.0% | 1.8% |
| Single Population | 69.6% | 50.7% | 50.2% |
| Never Married | 38.3% | 31.3% | 33.8% |
| Divorced | 19.4% | 6.0% | 10.8% |
| Widowed | 11.9% | 13.4% | 5.6% |
| space5 | | | |
| Household Size | 2.58 | 2.37 | 2.60 |
| Households | 1,992 | 70 | 124,010,992 |
| Family Households | 925 | 43 | 80,755,759 |
| Married couple, w/children | 9.6% | 37.2% | 30.5% |
| Married couple, no children | 45.0% | 46.5% | 42.9% |
| Non Family Households | 1,067 | 27 | 43,255,233 |
| Single householder, w/children | 30.4% | 0.0% | 15.8% |
| Single householder, no children | 15.0% | 16.3% | 10.8% |