| Index | Promise City | Iowa | National |
| Income per capita | $28,308 | $42,672 | $44,883 |
| Median household income | $41,538 | $81,387 | $81,333 |
| Median income owner occupied | $51,968 | $98,724 | $106,172 |
| Median income renter occupied | $0 | $45,890 | $52,080 |
| Median earnings male | $44,986 | $54,047 | $54,343 |
| Median earnings female | $20,293 | $36,462 | $38,439 |
| Unemployment rate | 0.0% | 3.2% | 4.9% |
| Poverty level | 29.2% | 12.3% | 15.1% |

| Labour Type | Male | Female |
| Construction industry | 0.0% | 0.0% |
| Manufacturing sector | 61.5% | 61.5% |
| Financial & insurance services | 0.0% | 0.0% |
| Wholesale & retail services | 0.0% | 0.0% |
| Public administration | 0.0% | 0.0% |
| Transportation, warehousing & utilities | 0.0% | 0.0% |
| Education, health & social services | 0.0% | 0.0% |
| Other | 38.5% | 38.5% |
| City | Population | Household Income | National Avg. |
| Cincinnati, IA | 275 | $69,115 | 15.0% |
| Corydon, IA | 1,714 | $69,007 | 15.2% |
| Numa, IA | 81 | $58,587 | 28.0% |
| Mystic, IA | 323 | $57,440 | 29.4% |
| Allerton, IA | 465 | $55,722 | 31.5% |
| Promise City, IA | 75 | $41,538 | 48.9% |
| City | Population | Household Income | National Avg. |
| Willow Creek, AK | 75 | $0 | 100.0% |
| Lindcove, CA | 75 | $0 | 100.0% |
| Paoli, CO | 75 | $0 | 100.0% |
| Comstock, MN | 75 | $0 | 100.0% |
| Foster, MO | 75 | $70,230 | 13.7% |
| Promise City, IA | 75 | $41,538 | 48.9% |