what county is gustine ca
Gustine, California. Homefacts City Report. Gustine is located in Merced County, CA. The population is 5,518, making Gustine the 8th largest city in Merced County. There are 5 public schools in Gustine with an average Homefacts rating of C+. The total crime rate for Gustine is low, and there are 13 registered sex offenders residing in the city.