| | Walford, IA | Marion, IA | United States |
| Population | 1,498 | 41,023 | 329,725,481 |
| Female Population | 48.7% | 53.4% | 50.5% |
| Male Population | 51.3% | 46.6% | 49.5% |
| Median Age | 36.5 | 39.3 | 38.4 |
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| Population - 2010 | 1,461 | 35,324 | 309,327,143 |
| Population - 2000 | 1,224 | 26,294 | 285,036,114 |
| Population - 1990 | 303 | 20,403 | 251,960,433 |
| Pop. 2000 to Now | 17.3% | 55.1% | 15.6% |
| Pop. 1990 to Now | 373.9% | 99.9% | 30.8% |
| space4 | | | |
| Population Density | 1,576.8 | 2,331.9 | 93.4 |
| Land Area | 1.0 | 17.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Walford, IA | Marion, IA | United States |
| Age 0 to 4 | 5.6% | 6.3% | 5.9% |
| Age 5 to 9 | 8.2% | 7.6% | 6.1% |
| Age 10 to 14 | 7.8% | 7.0% | 6.6% |
| Age 15 to 17 | 6.2% | 4.2% | 3.9% |
| Age 18 to 20 | 4.9% | 2.0% | 4.0% |
| Age 21 to 24 | 5.1% | 3.8% | 5.2% |
| Age 25 to 34 | 9.4% | 13.0% | 13.8% |
| Age 35 to 44 | 14.8% | 15.0% | 12.9% |
| Age 45 to 54 | 17.4% | 12.9% | 12.6% |
| Age 55 to 59 | 6.5% | 6.0% | 6.7% |
| Age 60 to 64 | 5.2% | 5.7% | 6.3% |
| Age 65 to 74 | 5.9% | 9.6% | 9.6% |
| Age 75 to 84 | 2.9% | 4.9% | 4.5% |
| Age 85 and over | 0.0% | 2.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Walford, IA | Marion, IA | United States |
| White | 92.5% | 90.7% | 59.4% |
| Black | 0.7% | 1.9% | 12.2% |
| Asian | 0.1% | 1.8% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.3% | 0.4% |
| Two or More Races | 5.3% | 2.8% | 3.2% |
| Hispanic | 1.0% | 2.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Walford, IA | Marion, IA | United States |
| Married Population | 64.0% | 56.1% | 49.8% |
| Currently Married | 63.3% | 54.7% | 48.0% |
| Married but Separated | 0.7% | 1.4% | 1.8% |
| Single Population | 36.0% | 43.9% | 50.2% |
| Never Married | 25.2% | 26.0% | 33.8% |
| Divorced | 9.1% | 11.8% | 10.8% |
| Widowed | 1.7% | 6.1% | 5.6% |
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| Household Size | 2.89 | 2.45 | 2.60 |
| Households | 519 | 16,638 | 124,010,992 |
| Family Households | 418 | 10,617 | 80,755,759 |
| Married couple, w/children | 42.1% | 36.0% | 30.5% |
| Married couple, no children | 45.9% | 44.5% | 42.9% |
| Non Family Households | 101 | 6,021 | 43,255,233 |
| Single householder, w/children | 10.3% | 14.7% | 15.8% |
| Single householder, no children | 1.7% | 4.8% | 10.8% |