If you are already 18 you can work any job and you have no limit to the hours of work. However, employers can still pay you with youth minimum wage.
Who hires 18 years old
According to teen.careers, Pizza Hut, KFC, Rent-A-Center, Cinemark and Allied Universal are 5 most companies which are likely to open online job listing for 18 years old.
Albuquerque, Chicago, Aurora, Houston and Dallas are 5 most cities with most job openings for 18 years old. Sales Associate, Server, Team Member, Customer Service Representative and Host/Hostess are 5 most job titles that 18 years old teenagers can apply.