A page for each charge you take, in the courts where you appear.
People search the charge and the place, such as a DUI lawyer in their county. Each charge the firm takes gets its own page, naming the court where it is heard and what the client should expect first. Every legal fact on it carries its statute or court rule and the firm's approval; law firm content marketing sets out who checks what.
A county page only where the firm handles cases in that court.
A county page earns its place when it names the courthouse, the charges the firm handles there and who answers the phone. The same text with another county's name says nothing new, and Google shows one of the two.
The hours on the page are the hours the phone is answered.
A caller who reaches voicemail at midnight calls the next firm, and searchers who go back to the results teach Google to show someone else. That makes the phone part of attorney SEO. If the phone is staffed around the clock, the page says so; if messages are returned in the morning, it says that. The Business Profile keeps the hours the office meets clients, which is what Google requires, and law firm local SEO keeps those hours true.