| Index | San Mar | Maryland | National |
| Median home price | $227,000 | $290,400 | $184,700 |
| Median rent asked | $0 | $1,264 | $949 |
| Avg. people per household | 1.1 | 2.6 | 2.6 |
| Owner occupied households | 100.0% | 66.5% | 63.6% |
| Renter occupied households | 0.0% | 33.5% | 36.4% |
| Population | Home Price | National Avg. | |
| Reid, MD | 0 | $0 | 100% |
| Antietam, MD | 45 | $0 | 100% |
| Eakles Mill, MD | 0 | $0 | 100% |
| Trego-Rohrersville Station, MD | 101 | $0 | 100% |
| Cearfoss, MD | 115 | $0 | 100% |
| San Mar, MD | 318 | $227,000 | 23% |
| Population | Home Price | National Avg. | |
| Red Cliff, CO | 318 | $345,200 | 87% |
| Dupont, IN | 318 | $76,500 | 59% |
| Cottonwood, TX | 318 | $300,000 | 62% |
| Smithville Flats, NY | 318 | $83,400 | 55% |
| B and E, TX | 318 | $91,500 | 50% |
| San Mar, MD | 318 | $227,000 | 23% |
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