ZIP Code data show selected income and tax items classified by State, ZIP Code, and size of adjusted gross income. Data are based on individual income tax returns filed with the IRS. The data include items, such as: - Number of returns, which approximates the number of households - Number of personal exemptions, which approximates the population - Adjusted gross income - Wages and salaries - Dividends before exclusion - Interest received Content For details of the exact fields available, please see the field_definitions.csv. Please note that the exact fields available can change from year to year, this definitions file was generated by retaining only the most recent year's entry from the years which had pdf manuals. The associated IRS form numbers are the most likely to change over time. Acknowledgements This data was generated by the [Internal Revenue Service][1]. [1]: https://www.irs.gov/uac/soi-tax-stats-individual-income-tax-statistics-zip-code-data-soi