Avenal is a city in Kings County, California, United States. It is part of the Hanford - Corcoran Metropolitan Statistical Area, which encompasses all of Kings County. The Zip Code for this community is 93204, telephone numbers begin with 386-XXXX The population was at the 15,689 2000 census. 7,062 of these residents were inmates at the Avenal State Prison, the first prison actively solicited by a community in the state of California. Many of the remaining residents largely either work at the prison or in the agriculture industry. The prison provides 1,000 jobs to residents. The California Department of Finance estimates that the population of Avenal had grown to 16,737 as of January 1, 2007. Avenal apartments for rent comparison page shows most up to date rent information on Avenal apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.