County shares of total national income and national top 1 percent income, and relative concentrations of national top 1% income, 2015
Panel A. Top 10 counties by share of national top 1% income
| Rank (from highest to lowest share of national top 1% income) | County | Share of total national income | Share of national top 1% income | Ratio of shares (concentration) | Rank (from highest to lowest ratio) |
|---|---|---|---|---|---|
| 1 | New York, NY | 1.84% | 6.00% | 3.3 | 2 |
| 2 | Los Angeles, CA | 3.37% | 4.69% | 1.4 | 70 |
| 3 | Santa Clara, CA | 1.28% | 2.60% | 2.0 | 20 |
| 4 | Cook, IL | 1.84% | 2.48% | 1.4 | 82 |
| 5 | Harris, TX | 1.63% | 2.19% | 1.3 | 87 |
| 6 | Fairfield, CT | 0.73% | 1.91% | 2.6 | 5 |
| 7 | Orange, CA | 1.30% | 1.78% | 1.4 | 76 |
| 8 | Westchester, NY | 0.69% | 1.77% | 2.5 | 7 |
| 9 | King, WA | 1.09% | 1.72% | 1.6 | 49 |
| 10 | Palm Beach, FL | 0.64% | 1.57% | 2.4 | 8 |
Panel B. Top 10 counties by the ratio of share of national top 1% income to share of total national income
| Rank (from highest to lowest ratio) | County | Share of total national income | Share of national top 1% income | Ratio of shares (concentration) | Rank (from highest to lowest share of national top 1% income) |
|---|---|---|---|---|---|
| 1 | Teton, WY | 0.04% | 0.13% | 3.3 | 136 |
| 2 | New York, NY | 1.84% | 6.00% | 3.3 | 1 |
| 3 | Collier, FL | 0.22% | 0.62% | 2.9 | 36 |
| 4 | Pitkin, CO | 0.02% | 0.04% | 2.7 | 297 |
| 5 | Fairfield, CT | 0.73% | 1.91% | 2.6 | 6 |
| 6 | Monroe, FL | 0.04% | 0.11% | 2.6 | 151 |
| 7 | Westchester, NY | 0.69% | 1.77% | 2.5 | 8 |
| 8 | Palm Beach, FL | 0.64% | 1.57% | 2.4 | 10 |
| 9 | Marin, CA | 0.23% | 0.55% | 2.4 | 41 |
| 10 | San Mateo, CA | 0.61% | 1.46% | 2.4 | 12 |
Notes: Panel A shows the 10 counties with the highest shares of national top 1% income, out of 3,061 counties nationwide. Share of total national income is the county’s total income as a share of total national income. Share of national top 1% income is the total income of families in the county who are in the national top 1%, as a share of all national top 1% income in the U.S. Panel B shows the 10 counties with the highest concentrations of national top 1% income (measured as the ratio of the county’s national top 1% share to the county’s total income share). Incomes are in 2015 dollars. Data are for tax units. Threshold for entering the national top 1% in 2015 was $421,926.
Source: Authors’ analysis of county- and state-level tax data from the Internal Revenue Service SOI Tax Stats (various years) and Piketty and Saez 2016