NOTES This map displays county-to-county migration data for 2000-2005 from the U.S. Internal Revenue Service. The IRS estimates are based on year-to-year changes of address on U.S. tax returns. All figures include only include people listed as exemptions on returns, so totals will be less than population. Because the IRS does not disclose small county flows because of privacy concerns, the county-to-county details will not add up to totals. Feedback