| | Ferndale, WA | Port Ludlow, WA | United States |
| Population | 14,777 | 3,046 | 329,725,481 |
| Female Population | 51.9% | 52.6% | 50.5% |
| Male Population | 48.1% | 47.4% | 49.5% |
| Median Age | 32.7 | 62.3 | 38.4 |
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| Population - 2010 | 11,493 | 3,011 | 309,327,143 |
| Population - 2000 | 8,758 | 1,968 | 285,036,114 |
| Population - 1990 | 5,398 | 936 | 251,960,433 |
| Pop. 2000 to Now | 77.3% | 44.5% | 15.6% |
| Pop. 1990 to Now | 187.7% | 203.9% | 30.8% |
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| Population Density | 2,114.9 | 264.0 | 93.4 |
| Land Area | 7.0 | 11.5 | 3,531,905.4 |
| Water Area | 0.1 | 2.6 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Ferndale, WA | Port Ludlow, WA | United States |
| Age 0 to 4 | 8.4% | 5.3% | 5.9% |
| Age 5 to 9 | 8.9% | 3.3% | 6.1% |
| Age 10 to 14 | 7.5% | 5.1% | 6.6% |
| Age 15 to 17 | 4.6% | 0.8% | 3.9% |
| Age 18 to 20 | 2.4% | 1.3% | 4.0% |
| Age 21 to 24 | 3.9% | 1.1% | 5.2% |
| Age 25 to 34 | 18.1% | 7.2% | 13.8% |
| Age 35 to 44 | 11.6% | 7.6% | 12.9% |
| Age 45 to 54 | 9.2% | 9.8% | 12.6% |
| Age 55 to 59 | 6.2% | 6.3% | 6.7% |
| Age 60 to 64 | 3.7% | 7.6% | 6.3% |
| Age 65 to 74 | 10.5% | 22.4% | 9.6% |
| Age 75 to 84 | 3.0% | 19.8% | 4.5% |
| Age 85 and over | 1.9% | 2.4% | 1.9% |
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| Race | | | |
| | Ferndale, WA | Port Ludlow, WA | United States |
| White | 74.0% | 84.4% | 59.4% |
| Black | 0.2% | 0.0% | 12.2% |
| Asian | 7.5% | 3.3% | 5.6% |
| Native American | 2.6% | 0.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 1.7% | 0.2% |
| Other | 0.3% | 0.0% | 0.4% |
| Two or More Races | 2.6% | 2.4% | 3.2% |
| Hispanic | 12.7% | 7.7% | 18.4% |
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| Marriage & Family | | | |
| | Ferndale, WA | Port Ludlow, WA | United States |
| Married Population | 57.2% | 66.0% | 49.8% |
| Currently Married | 53.0% | 64.3% | 48.0% |
| Married but Separated | 4.2% | 1.6% | 1.8% |
| Single Population | 42.8% | 34.0% | 50.2% |
| Never Married | 27.3% | 15.5% | 33.8% |
| Divorced | 10.0% | 10.0% | 10.8% |
| Widowed | 5.4% | 8.6% | 5.6% |
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| Household Size | 2.99 | 2.12 | 2.60 |
| Households | 4,936 | 1,434 | 124,010,992 |
| Family Households | 3,792 | 1,045 | 80,755,759 |
| Married couple, w/children | 43.6% | 9.8% | 30.5% |
| Married couple, no children | 33.0% | 67.9% | 42.9% |
| Non Family Households | 1,144 | 389 | 43,255,233 |
| Single householder, w/children | 18.0% | 12.2% | 15.8% |
| Single householder, no children | 5.3% | 10.1% | 10.8% |