| | Madrid, NM | Brunswick, MD | United States |
| Population | 276 | 7,578 | 329,725,481 |
| Female Population | 37.3% | 48.2% | 50.5% |
| Male Population | 62.7% | 51.8% | 49.5% |
| Median Age | 59.6 | 37 | 38.4 |
| space3 | | | |
| Population - 2010 | 88 | 5,890 | 309,327,143 |
| Population - 2000 | 149 | 4,894 | 285,036,114 |
| Population - 1990 | 104 | 5,117 | 251,960,433 |
| Pop. 2000 to Now | 5.4% | 35.9% | 15.6% |
| Pop. 1990 to Now | 51.0% | 30.0% | 30.8% |
| space4 | | | |
| Population Density | 198.6 | 2,321.0 | 93.4 |
| Land Area | 1.4 | 3.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Madrid, NM | Brunswick, MD | United States |
| Age 0 to 4 | 2.5% | 5.7% | 5.9% |
| Age 5 to 9 | 0.0% | 6.0% | 6.1% |
| Age 10 to 14 | 3.6% | 6.8% | 6.6% |
| Age 15 to 17 | 0.0% | 5.8% | 3.9% |
| Age 18 to 20 | 0.0% | 3.6% | 4.0% |
| Age 21 to 24 | 0.0% | 3.3% | 5.2% |
| Age 25 to 34 | 2.9% | 13.7% | 13.8% |
| Age 35 to 44 | 8.3% | 15.1% | 12.9% |
| Age 45 to 54 | 9.4% | 16.7% | 12.6% |
| Age 55 to 59 | 41.7% | 6.2% | 6.7% |
| Age 60 to 64 | 0.0% | 6.6% | 6.3% |
| Age 65 to 74 | 25.7% | 7.3% | 9.6% |
| Age 75 to 84 | 5.8% | 2.4% | 4.5% |
| Age 85 and over | 0.0% | 0.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Madrid, NM | Brunswick, MD | United States |
| White | 100.0% | 73.4% | 59.4% |
| Black | 0.0% | 9.5% | 12.2% |
| Asian | 0.0% | 1.5% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 9.3% | 3.2% |
| Hispanic | 0.0% | 6.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Madrid, NM | Brunswick, MD | United States |
| Married Population | 27.4% | 53.8% | 49.8% |
| Currently Married | 27.4% | 52.6% | 48.0% |
| Married but Separated | 0.0% | 1.1% | 1.8% |
| Single Population | 72.6% | 46.2% | 50.2% |
| Never Married | 44.4% | 32.8% | 33.8% |
| Divorced | 24.7% | 10.6% | 10.8% |
| Widowed | 3.5% | 2.8% | 5.6% |
| space5 | | | |
| Household Size | 1.33 | 2.66 | 2.60 |
| Households | 208 | 2,851 | 124,010,992 |
| Family Households | 43 | 1,901 | 80,755,759 |
| Married couple, w/children | 18.6% | 40.9% | 30.5% |
| Married couple, no children | 60.5% | 41.0% | 42.9% |
| Non Family Households | 165 | 950 | 43,255,233 |
| Single householder, w/children | 20.9% | 10.9% | 15.8% |
| Single householder, no children | 0.0% | 7.2% | 10.8% |