Table 1.

Selected block groups and total block groups in Harris County: mean population and income

Category	30 selected block groups	1,813 total block groups	Low-income block groups	Middle-income block groups	High-income block groups
Mean population per block group	1,830	1,775	1,909	2,069	1,935
Median household income per block group	$43,643	$42,598	$23,064	$36,966	$62,550