A Texas law banning government officials from talking business in informal settings remains in place.
The U.S. Supreme Court on Monday refused to hear an appeal to the Texas Open Meetings Act case, which means challenges are over.
A federal appeals court last year upheld the 1967 law. It prohibits a quorum of members of a governmental body from deliberating in secret. Violations are punishable by up to six months in jail and a $500 fine.
Officials from 15 Texas cities challenged the law in 2009. They argued that it banned such behavior as simply talking to a colleague about a matter on a city meeting agenda.
A U.S. district judge ruled against the cities in 2011, prompting an appeal to the New Orleans-based 5th U.S. Circuit Court of Appeals.