| Index | Arnold | Missouri | National |
| Income per capita | $45,295 | $39,715 | $44,883 |
| Median household income | $95,401 | $72,613 | $81,333 |
| Median income owner occupied | $105,891 | $90,986 | $106,172 |
| Median income renter occupied | $65,201 | $45,210 | $52,080 |
| Median earnings male | $71,081 | $52,324 | $54,343 |
| Median earnings female | $47,153 | $36,971 | $38,439 |
| Unemployment rate | 2.2% | 4.4% | 4.9% |
| Poverty level | 8.6% | 15.3% | 15.1% |

| Labour Type | Male | Female |
| Construction industry | 17.6% | 17.6% |
| Manufacturing sector | 18.3% | 18.3% |
| Financial & insurance services | 3.3% | 3.3% |
| Wholesale & retail services | 11.8% | 11.8% |
| Public administration | 3.3% | 3.3% |
| Transportation, warehousing & utilities | 6.9% | 6.9% |
| Education, health & social services | 6.0% | 6.0% |
| Other | 31.3% | 31.3% |
| City | Population | Household Income | National Avg. |
| Westwood, MO | 321 | $368,561 | 353.2% |
| Ladue, MO | 8,903 | $368,480 | 353.1% |
| Huntleigh, MO | 463 | $365,824 | 349.8% |
| Country Life Acres, MO | 54 | $365,640 | 349.6% |
| Clarkson Valley, MO | 2,697 | $312,556 | 284.3% |
| Arnold, MO | 21,866 | $95,401 | 17.3% |
| City | Population | Household Income | National Avg. |
| Fort St. John, BC | 21,858 | n/a | |
| Milwaukie, OR | 21,853 | $104,073 | 28.0% |
| La Porte, IN | 21,881 | $62,134 | 23.6% |
| Sapulpa, OK | 21,843 | $82,552 | 1.5% |
| Sanford, ME | 21,841 | $87,317 | 7.4% |
| Arnold, MO | 21,866 | $95,401 | 17.3% |