| | Cottonwood (Shasta County), CA | Ignacio, CO | United States |
| Population | 5,912 | 1,319 | 329,725,481 |
| Female Population | 51.8% | 50.1% | 50.5% |
| Male Population | 48.2% | 49.9% | 49.5% |
| Median Age | 39.3 | 37.1 | 38.4 |
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| Population - 2010 | 3,072 | 862 | 309,327,143 |
| Population - 2000 | 2,960 | 669 | 285,036,114 |
| Population - 1990 | 1,747 | 720 | 251,960,433 |
| Pop. 2000 to Now | 10.8% | 44.0% | 15.6% |
| Pop. 1990 to Now | 87.8% | 33.8% | 30.8% |
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| Population Density | 2,546.1 | 3,053.2 | 93.4 |
| Land Area | 2.3 | 0.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Cottonwood (Shasta County), CA | Ignacio, CO | United States |
| Age 0 to 4 | 7.3% | 6.7% | 5.9% |
| Age 5 to 9 | 8.1% | 6.4% | 6.1% |
| Age 10 to 14 | 7.5% | 8.9% | 6.6% |
| Age 15 to 17 | 2.7% | 2.6% | 3.9% |
| Age 18 to 20 | 1.9% | 2.1% | 4.0% |
| Age 21 to 24 | 4.1% | 4.9% | 5.2% |
| Age 25 to 34 | 9.5% | 16.2% | 13.8% |
| Age 35 to 44 | 16.9% | 13.0% | 12.9% |
| Age 45 to 54 | 16.9% | 12.2% | 12.6% |
| Age 55 to 59 | 6.2% | 8.7% | 6.7% |
| Age 60 to 64 | 4.5% | 6.4% | 6.3% |
| Age 65 to 74 | 10.4% | 7.6% | 9.6% |
| Age 75 to 84 | 2.7% | 3.0% | 4.5% |
| Age 85 and over | 1.3% | 1.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Cottonwood (Shasta County), CA | Ignacio, CO | United States |
| White | 77.9% | 41.6% | 59.4% |
| Black | 0.9% | 0.0% | 12.2% |
| Asian | 1.8% | 0.3% | 5.6% |
| Native American | 1.3% | 15.2% | 0.6% |
| Hawaiian, Pacific Islander | 1.1% | 0.0% | 0.2% |
| Other | 0.4% | 0.0% | 0.4% |
| Two or More Races | 4.1% | 3.4% | 3.2% |
| Hispanic | 12.5% | 39.5% | 18.4% |
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| Marriage & Family | | | |
| | Cottonwood (Shasta County), CA | Ignacio, CO | United States |
| Married Population | 60.1% | 45.6% | 49.8% |
| Currently Married | 56.4% | 42.8% | 48.0% |
| Married but Separated | 3.7% | 2.8% | 1.8% |
| Single Population | 39.9% | 54.4% | 50.2% |
| Never Married | 21.5% | 33.1% | 33.8% |
| Divorced | 14.1% | 17.1% | 10.8% |
| Widowed | 4.2% | 4.2% | 5.6% |
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| Household Size | 2.66 | 2.74 | 2.60 |
| Households | 2,220 | 481 | 124,010,992 |
| Family Households | 1,644 | 298 | 80,755,759 |
| Married couple, w/children | 31.3% | 25.5% | 30.5% |
| Married couple, no children | 43.3% | 37.9% | 42.9% |
| Non Family Households | 576 | 183 | 43,255,233 |
| Single householder, w/children | 16.7% | 25.8% | 15.8% |
| Single householder, no children | 8.7% | 10.7% | 10.8% |