| Index | Elk Plain | Washington | National |
| Income per capita | $53,419 | $48,431 | $44,883 |
| Median household income | $113,769 | $91,816 | $81,333 |
| Median income owner occupied | $129,744 | $120,601 | $106,172 |
| Median income renter occupied | $71,194 | $60,275 | $52,080 |
| Median earnings male | $85,925 | $60,502 | $54,343 |
| Median earnings female | $41,429 | $39,812 | $38,439 |
| Unemployment rate | 3.9% | 4.5% | 4.9% |
| Poverty level | 12.9% | 12.7% | 15.1% |

| Labour Type | Male | Female |
| Construction industry | 22.3% | 22.3% |
| Manufacturing sector | 17.4% | 17.4% |
| Financial & insurance services | 0.9% | 0.9% |
| Wholesale & retail services | 13.6% | 13.6% |
| Public administration | 5.6% | 5.6% |
| Transportation, warehousing & utilities | 11.2% | 11.2% |
| Education, health & social services | 4.0% | 4.0% |
| Other | 23.2% | 23.2% |
| City | Population | Household Income | National Avg. |
| McKenna, WA | 644 | $215,656 | 165.2% |
| Fox Island, WA | 3,695 | $190,110 | 133.7% |
| Lake Tapps, WA | 12,497 | $172,625 | 112.2% |
| Fife Heights, WA | 1,977 | $172,085 | 111.6% |
| Prairie Heights, WA | 4,974 | $163,599 | 101.1% |
| Elk Plain, WA | 15,587 | $113,769 | 39.9% |
| City | Population | Household Income | National Avg. |
| Hartford, WI | 15,591 | $91,719 | 12.8% |
| St. Augustine, FL | 15,581 | $88,736 | 9.1% |
| Graham, NC | 15,581 | $61,701 | 24.1% |
| Swampscott, MA | 15,599 | $156,084 | 91.9% |
| Greenwood Village, CO | 15,570 | $188,442 | 131.7% |
| Elk Plain, WA | 15,587 | $113,769 | 39.9% |