| Index | Arnold | Missouri | National |
| Median home price | $165,700 | $141,200 | $184,700 |
| Median rent asked | $958 | $759 | $949 |
| Avg. people per household | 2.4 | 2.4 | 2.6 |
| Owner occupied households | 74.3% | 66.8% | 63.6% |
| Renter occupied households | 25.7% | 33.2% | 36.4% |
| Population | Home Price | National Avg. | |
| Peaceful Village, MO | 92 | $9,999 | 95% |
| Washington Park, IL | 3,909 | $32,900 | 82% |
| Alorton, IL | 2,077 | $45,000 | 76% |
| Centreville, IL | 4,946 | $47,500 | 74% |
| Cahokia, IL | 14,035 | $49,400 | 73% |
| Arnold, MO | 21,144 | $165,700 | 10% |
| Population | Home Price | National Avg. | |
| Easley, SC | 21,149 | $176,000 | 5% |
| Ashland, OR | 21,138 | $469,400 | 154% |
| Covington, WA | 21,131 | $386,900 | 109% |
| Piqua, OH | 21,159 | $89,200 | 52% |
| Sanford, ME | 21,166 | $193,100 | 5% |
| Arnold, MO | 21,144 | $165,700 | 10% |
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