| Index | Union | Illinois | National |
| Median home price | $312,935 | $308,565 | $326,622 |
| Median rent asked | $1,360 | $1,374 | $1,444 |
| Avg. people per household | 2.7 | 2.6 | 2.6 |
| Owner occupied households | 79.2% | 66.0% | 63.6% |
| Renter occupied households | 20.8% | 34.0% | 36.4% |

| Population | Home Price | National Avg. | |
| Garden Prairie, IL | 271 | $149,762 | 54% |
| Capron, IL | 1,689 | $212,325 | 35% |
| Harvard, IL | 9,547 | $226,550 | 31% |
| McCullom Lake, IL | 1,222 | $245,561 | 25% |
| Marengo, IL | 8,096 | $281,925 | 14% |
| Union, IL | 699 | $312,935 | 4% |
| Population | Home Price | National Avg. | |
| Humboldt, SD | 699 | $249,471 | 24% |
| Stanwood, IA | 699 | $183,789 | 44% |
| LaMoure, ND | 699 | $167,550 | 49% |
| Bergman, AR | 699 | $173,462 | 47% |
| Sandyfield, NC | 699 | $108,414 | 67% |
| Union, IL | 699 | $312,935 | 4% |