| Index | Garretts Mill | Maryland | National |
| Median home price | $211,300 | $290,400 | $184,700 |
| Median rent asked | $0 | $1,264 | $949 |
| Avg. people per household | 3.2 | 2.6 | 2.6 |
| Owner occupied households | 87.9% | 66.5% | 63.6% |
| Renter occupied households | 12.1% | 33.5% | 36.4% |
| Index | Garretts Mill | Maryland | National |
| Zillow home value index | n/a | $270,200 | $196,500 |
| Year over year appreciation rate | n/a | 5.01% | 6.79% |
| 5 year average appreciation rate | n/a | 3.84% | 5.28% |
| 10 year average appreciation rate | n/a | -1.76% | 0.01% |
| City, State | Population | Home Price | National Avg. |
| Rohrersville, MD | 65 | $0 | 100% |
| Brownsville, MD | 0 | $0 | 100% |
| Gapland, MD | 72 | $0 | 100% |
| Mercersville, MD | 74 | $0 | 100% |
| Downsville, MD | 360 | $0 | 100% |
| Garretts Mill, MD | 402 | $211,300 | 14% |
| City, State | Population | Home Price | National Avg. |
| Crisman, CO | 402 | $405,900 | 120% |
| Bagley, WI | 402 | $77,400 | 58% |
| Dahlgren, IL | 402 | $47,500 | 74% |
| Springboro, PA | 402 | $82,600 | 55% |
| Nevis, MN | 402 | $102,800 | 44% |
| Garretts Mill, MD | 402 | $211,300 | 14% |