| Index | Williamson | Iowa | National |
| Income per capita | $21,265 | $42,672 | $44,883 |
| Median household income | $0 | $81,387 | $81,333 |
| Median income owner occupied | $79,480 | $98,724 | $106,172 |
| Median income renter occupied | $0 | $45,890 | $52,080 |
| Median earnings male | $94,452 | $54,047 | $54,343 |
| Median earnings female | $39,795 | $36,462 | $38,439 |
| Unemployment rate | 1.9% | 3.2% | 4.9% |
| Poverty level | 13.8% | 12.3% | 15.1% |


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| Labour Type | Male | Female |
| Construction industry | 12.0% | 12.0% |
| Manufacturing sector | 24.0% | 24.0% |
| Financial & insurance services | 0.0% | 0.0% |
| Wholesale & retail services | 20.0% | 20.0% |
| Public administration | 0.0% | 0.0% |
| Transportation, warehousing & utilities | 44.0% | 44.0% |
| Education, health & social services | 0.0% | 0.0% |
| Other | 0.0% | 0.0% |
| City | Population | Household Income | National Avg. |
| Milo, IA | 808 | $94,221 | 15.8% |
| Lacona, IA | 346 | $87,373 | 7.4% |
| Melrose, IA | 185 | $73,071 | 10.2% |
| Chariton, IA | 4,281 | $72,575 | 10.8% |
| Melcher-Dallas, IA | 1,343 | $66,511 | 18.2% |
| Williamson, IA | 192 | $0 | 100.0% |
| City | Population | Household Income | National Avg. |
| Nikolaevsk, AK | 192 | $76,795 | 5.6% |
| Bluff City, AR | 192 | $102,408 | 25.9% |
| Cottonwood CDP, AZ | 192 | $52,289 | 35.7% |
| Lewis, CO | 192 | $0 | 100.0% |
| Avalon, GA | 192 | $0 | 100.0% |
| Williamson, IA | 192 | $0 | 100.0% |