Sentier Research has issued their estimate of median household income in the United States for December 2018, finding the typical income earned by an American household was $63,517 for the month, slightly down from the firm's initial estimate of $63,554 for November 2018. Sentier's revised, inflation-adjusted estimate for November 2018 is $63,518, where they describe their initial estimate for December's median household income as unchanged.
The following chart shows the nominal (red) and inflation-adjusted (blue) trends for median household income in the United States from January 2000 through December 2018, where the newest nominal data point shows up as the first month-over-month dip after a long uninterrupted upward trend that began in December 2017. The inflation-adjusted figures are presented in terms of constant December 2018 U.S. dollars.
Meanwhile, the year-over-year growth rate of median household income has continued at near record-highs.
With that final estimate, 2018 proved to be one the best years ever for income gains for typical American households.