Washington: Out-migration Compare to others State rankings for U.S. County rankings for Idaho Download data Download state data for the US Download county data for Idaho Download multiple indicators/regions In Washington between 2017 and 2018, the number of tax returns filed by individuals or households moving out of Washington was 270. Of these: 61.5 percent were filed by people or households moving to another county in Idaho State 38.5 percent were filed by people or households moving to another state 0.0 percent were filed by people or households moving to another country   Data represents all returns filed/processed through the Individual Master File System. NA: data have been suppressed for reasons of disclosure. Source: 2020 Internal Revenue Service (IRS) - (https://www.irs.gov/statistics/soi-tax-stats-migration-data); DATE LAST UPDATED: October 20, 2020