| Index | Duncan | Iowa | National |
| Income per capita | $24,412 | $28,872 | $29,829 |
| Median household income | $63,654 | $54,570 | $55,322 |
| Median income owner occupied | $63,654 | $66,527 | $70,586 |
| Median income renter occupied | $0 | $30,828 | $35,192 |
| Median earnings male | $0 | $37,409 | $36,919 |
| Median earnings female | $0 | $25,115 | $26,250 |
| Unemployment rate | 0.0% | 3.1% | 4.7% |
| Poverty level | 41.2% | 12.3% | 15.1% |


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| Labour Type | Male | Female |
| Construction industry | 0.0% | 0.0% |
| Manufacturing sector | 0.0% | 0.0% |
| Financial & insurance services | 0.0% | 0.0% |
| Wholesale & retail services | 34.4% | 34.4% |
| Public administration | 0.0% | 0.0% |
| Transportation, warehousing & utilities | 0.0% | 0.0% |
| Education, health & social services | 0.0% | 0.0% |
| Other | 65.6% | 65.6% |
| City | Population | Household Income | National Avg. |
| Ventura, IA | 761 | $73,438 | 32.7% |
| Meservey, IA | 277 | $72,083 | 30.3% |
| Crystal Lake, IA | 264 | $65,000 | 17.5% |
| Garner, IA | 3,060 | $63,625 | 15.0% |
| Kanawha, IA | 954 | $63,625 | 15.0% |
| Duncan, IA | 102 | $63,654 | 15.1% |
| City | Population | Household Income | National Avg. |
| St. George, AK | 102 | $64,583 | 16.7% |
| Kingvale, CA | 102 | $0 | 100.0% |
| Mount Laguna, CA | 102 | $0 | 100.0% |
| Phillipsville, CA | 102 | $2,499 | 95.5% |
| Hull, GA | 102 | $0 | 100.0% |
| Duncan, IA | 102 | $63,654 | 15.1% |