91789 is zip code located in Walnut, California. The population is 42,332, making 91789 the largest zipcode in Walnut.
There are 11 public schools in 91789 with an average Homefacts rating of A. The total crime rate for Walnut is very low , and there are 5 registered sex offenders residing in the zip code 91789. Unemployment in 91789 is moderate.