Houston is a multicultural city with a thriving international community supported by the third largest concentration of consular offices in the United States, representing 86 nations. In addition to historical Southeast Texas culture, Houston became the fourth-most populous city in the United States. Officially, Houston is nicknamed the ""Space City"" as it is home to NASA's Lyndon B. Johnson Space Center, where Mission Control Center is located. "Houston" was the first word spoken on the moon. Many locals refer to Houston as ""Bayou City."" Other nicknames include ""H-Town"", ""Clutch City"", and ""Magnolia City"."