IRS migration data is the foundation for the migration figures shown in Emsi’s products. The data is based on tax returns filed and generally lags by a couple of years. Note, however, that this IRS data is not used in estimating migration for our demographics data. Our demographics data uses estimated migration based on Census population estimates and CDC birth/death rates.
The IRS’s migration data can be found here.
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Let us know what specific questions we can help you with (we may even add your question to our knowledge base).