Seasonal adjustment

The quarterly estimates of state personal income are adjusted, where appropriate, to remove from the time series of the source data the average effect of variations that normally occur at about the same time and in about the same magnitude each year--for example, weather and holidays. After seasonal adjustment, cyclical and other short-term changes in the economy stand out more clearly. For the income components for which no state-level quarterly source data are available, the quarterly series are estimated from the trend in the annual state estimates, and the resulting estimates are on a seasonally adjusted basis.

Q. Do you have state quarterly personal income estimates not seasonally adjusted?
A. Certain inputs to personal income are not available not seasonally adjusted; therefore personal income is not available not seasonally adjusted.

See Quarterly state personal income estimates