| Index | St. Peter | Illinois | National |
| Income per capita | $31,868 | $47,397 | $44,883 |
| Median household income | $74,518 | $88,967 | $81,333 |
| Median income owner occupied | $76,684 | $111,557 | $106,172 |
| Median income renter occupied | $75,174 | $52,117 | $52,080 |
| Median earnings male | $54,698 | $60,185 | $54,343 |
| Median earnings female | $36,339 | $40,368 | $38,439 |
| Unemployment rate | 1.4% | 6.6% | 4.9% |
| Poverty level | 13.3% | 14.0% | 15.1% |

| Labour Type | Male | Female |
| Construction industry | 15.0% | 15.0% |
| Manufacturing sector | 6.5% | 6.5% |
| Financial & insurance services | 3.7% | 3.7% |
| Wholesale & retail services | 25.2% | 25.2% |
| Public administration | 6.5% | 6.5% |
| Transportation, warehousing & utilities | 5.6% | 5.6% |
| Education, health & social services | 5.6% | 5.6% |
| Other | 31.8% | 31.8% |
| City | Population | Household Income | National Avg. |
| Patoka, IL | 599 | $79,423 | 2.3% |
| Mason, IL | 249 | $79,422 | 2.3% |
| Iola, IL | 94 | $75,814 | 6.8% |
| Altamont, IL | 2,313 | $72,205 | 11.2% |
| Brownstown, IL | 871 | $69,806 | 14.2% |
| St. Peter, IL | 456 | $74,518 | 8.4% |
| City | Population | Household Income | National Avg. |
| Emmet, AR | 456 | $79,549 | 2.2% |
| Fort Thomas, AZ | 456 | $130,077 | 59.9% |
| Sugar City, CO | 456 | $58,278 | 28.3% |
| Cannondale, CT | 456 | $0 | 100.0% |
| Prairie du Rocher, IL | 456 | $73,114 | 10.1% |
| St. Peter, IL | 456 | $74,518 | 8.4% |