| Index | Castalia | Iowa | National |
| Median home price | $140,256 | $240,019 | $326,622 |
| Median rent asked | $942 | $1,071 | $1,444 |
| Avg. people per household | 1.7 | 2.4 | 2.6 |
| Owner occupied households | 86.0% | 71.1% | 63.6% |
| Renter occupied households | 14.0% | 28.9% | 36.4% |

| Population | Home Price | National Avg. | |
| Hawkeye, IA | 507 | $119,946 | 63% |
| St. Olaf, IA | 134 | $127,795 | 61% |
| St. Lucas, IA | 132 | $145,465 | 55% |
| Elgin, IA | 663 | $149,834 | 54% |
| Postville, IA | 2,624 | $172,405 | 47% |
| Castalia, IA | 172 | $140,256 | 57% |
| Population | Home Price | National Avg. | |
| Kirvin, TX | 172 | $112,957 | 65% |
| Cataract, WI | 172 | $226,688 | 31% |
| Randolph, KS | 172 | $216,637 | 34% |
| Elgin, AZ | 172 | $865,710 | 165% |
| Sinai, SD | 172 | $118,780 | 64% |
| Castalia, IA | 172 | $140,256 | 57% |