Houston is in Harris County. Harris County has had 96 executions since the death penalty was reinstated, after being declared unconstitutional, in the 1970s. Only one U.S. state other than Texas, Virginia, which has had 98 executions, has carried out more death penalty sentences than Harris County.
Harris County has about 1% of the population of the United States, but accounts for about 10% of U.S. executions since 1977.
Only a handful of countries in the world have had as many executions in the past 30 years at Harris County. China, Iran and Saudi Arabia clearly have more, but few other countries are in the list.