| Index | St. Mary | Missouri | National |
| Median home price | $139,229 | $249,551 | $326,622 |
| Median rent asked | $909 | $1,140 | $1,444 |
| Avg. people per household | 2.5 | 2.4 | 2.6 |
| Owner occupied households | 85.1% | 66.8% | 63.6% |
| Renter occupied households | 14.9% | 33.2% | 36.4% |

| Population | Home Price | National Avg. | |
| Brewer, MO | 484 | $0 | 100% |
| Weingarten, MO | 149 | $0 | 100% |
| Lithium, MO | 92 | $0 | 100% |
| Rockwood, IL | 26 | $110,532 | 66% |
| Evansville, IL | 790 | $115,876 | 65% |
| St. Mary, MO | 266 | $139,229 | 57% |
| Population | Home Price | National Avg. | |
| Browntown, WI | 266 | $162,557 | 50% |
| Buck Creek, IN | 266 | $157,151 | 52% |
| Owaneco, IL | 266 | $134,219 | 59% |
| Henning, IL | 266 | $113,430 | 65% |
| Peetz, CO | 266 | $208,069 | 36% |
| St. Mary, MO | 266 | $139,229 | 57% |