Depending on where exactly you are, I know of four:
Firing Line - Burbank and Northridge:
http://www.firingline.net/ The range in Northridge only goes back to 15 yards, 25 yards in Burbank.
Gun World Target Range - Van Nuys: (The store is in Burbank, the range is in Van Nuys)
Angeles Shooting Ranges - Lake View Terrace (Tujunga Canyon) This is an outdoor facility. The pistol range goes to 100 yards, the rifle range out to 700 yards.
I'm sure there are a few others, but at least these 4 cover most of the valley pretty well.
Welcome back to the shooting arts!