Kings County is located in the Central Valley of the U.S. state of California. It is located in a rich agricultural region. The county seat is Hanford. The population was 151,381 as of January 1, 2007, the median age was 30 years. For every 100 females there were 134.80 males. Kings County was formed in 1893 and derives its name from the Kings River. The county has a total area of 1,391 miČ and 1,391 miČ of it is land. The median income for a household in the county was $35,749, and the median income for a family was $38,111.