91788 is zip code located in Walnut, California. The population is , making 91788 the 2nd largest zipcode in Walnut.
There are 0 public schools in 91788 with an average Homefacts rating of NA. The total crime rate for Walnut is very low , and there are 0 registered sex offenders residing in the zip code 91788. Unemployment in 91788 is moderate.