what county is gilbert az in
Homefacts City Report. Gilbert is located in Maricopa County, AZ. The population is 221,136, making Gilbert the 4th largest city in Maricopa County and the 5th largest city in the state of Arizona. There are 65 public schools in Gilbert with an average Homefacts rating of A. The total crime rate for Gilbert is low, and there are 41 registered sex offenders residing in the city.