what county is lathrop in california
Homefacts City Report. Lathrop is located in San Joaquin County, CA. The population is 18,128, making Lathrop the 5th largest city in San Joaquin County. There are 5 public schools in Lathrop with an average Homefacts rating of C. The total crime rate for Lathrop is moderate, and there are 29 registered sex offenders residing in the city.