https://www.census.gov/library/publications/2024/demo/p60-282.html
How to read (Example):
Median Household Income for a household where householder has a high school diploma (but no college) is $55,810. 24.1% of ALL US households fall into this category.
(From u/TA-MajestyPalm)
The chart explains the tern to mean “head of household”. It’s a tax term explained on your 1040.
Generally, to qualify for head of household filing status, you must be able to claim a qualifying child or qualifying relative as a dependent.
In a typical marriage, either spouse can claim. Naturally, the one who makes the most is wise to claim “head of household”.