| Index | Castalia | Iowa | National |
| Income per capita | $25,496 | $28,872 | $29,829 |
| Median household income | $43,750 | $54,570 | $55,322 |
| Median income owner occupied | $50,833 | $66,527 | $70,586 |
| Median income renter occupied | $0 | $30,828 | $35,192 |
| Median earnings male | $23,750 | $37,409 | $36,919 |
| Median earnings female | $22,250 | $25,115 | $26,250 |
| Unemployment rate | 4.1% | 3.1% | 4.7% |
| Poverty level | 15.4% | 12.3% | 15.1% |


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| Labour Type | Male | Female |
| Construction industry | 33.3% | 33.3% |
| Manufacturing sector | 12.5% | 12.5% |
| Financial & insurance services | 0.0% | 0.0% |
| Wholesale & retail services | 14.6% | 14.6% |
| Public administration | 0.0% | 0.0% |
| Transportation, warehousing & utilities | 2.1% | 2.1% |
| Education, health & social services | 10.4% | 10.4% |
| Other | 27.1% | 27.1% |
| City | Population | Household Income | National Avg. |
| St. Olaf, IA | 128 | $63,750 | 15.2% |
| Calmar, IA | 989 | $59,844 | 8.2% |
| Fort Atkinson, IA | 382 | $59,792 | 8.1% |
| Decorah, IA | 7,615 | $55,920 | 1.1% |
| Clermont, IA | 482 | $54,861 | 0.8% |
| Castalia, IA | 169 | $43,750 | 20.9% |
| City | Population | Household Income | National Avg. |
| Vernon, AZ | 169 | $0 | 100.0% |
| Farmington, CA | 169 | $0 | 100.0% |
| Sisquoc, CA | 169 | $50,893 | 8.0% |
| Admire, KS | 169 | $45,529 | 17.7% |
| Westphalia, KS | 169 | $34,559 | 37.5% |
| Castalia, IA | 169 | $43,750 | 20.9% |