| Index | Duncan | Iowa | National |
| Median home price | $0 | $240,019 | $326,622 |
| Median rent asked | $0 | $1,071 | $1,444 |
| Avg. people per household | 0.8 | 2.4 | 2.6 |
| Owner occupied households | 100.0% | 71.1% | 63.6% |
| Renter occupied households | 0.0% | 28.9% | 36.4% |

| Population | Home Price | National Avg. | |
| Hayfield, IA | 58 | $0 | 100% |
| Miller, IA | 31 | $0 | 100% |
| Hutchins, IA | 32 | $0 | 100% |
| Corwith, IA | 227 | $61,746 | 81% |
| Goodell, IA | 116 | $78,856 | 76% |
| Duncan, IA | 104 | $0 | 100% |
| Population | Home Price | National Avg. | |
| Rutherford, CA | 104 | $0 | 100% |
| Allenville, MO | 104 | $55,817 | 83% |
| Bairdstown, OH | 104 | $118,261 | 64% |
| Sombrillo, NM | 104 | $433,178 | 33% |
| Saddle Butte, MT | 104 | $499,215 | 53% |
| Duncan, IA | 104 | $0 | 100% |