what county is keyes in
Homefacts City Report. Keyes is located in Stanislaus County, CA. The population is 6,301. There are 2 public schools in Keyes with an average Homefacts rating of B-. The total crime rate for Keyes is moderate, and there are 8 registered sex offenders residing in the city. Unemployment in Keyes is high and the median home sales price is $0.