There are dozens of national job sites that serve the United States. Each of these sites are "general" in their reach, meaning they list ALL types of jobs across the country.
Some have been around since the late 90's (i.e. Monster) while others like Jobcase are much newer.
Top 5 Job Sites: Indeed, Ziprecruiter, Glassdoor, Monster, and CareerBuilder.
These sites have the most traffic and biggest brand awareness.