In the graphic above, “Low income” refers to households in the bottom 20 percent of the income spectrum, which was roughly $20,000 a year and below as of 2011. “Middle income” refers to households in the middle 20 percent, whose income is between roughly $39,000 and $62,000 a year. “High income” refers to households in the top 20 percent, which is over $102,000 per year.