Can you leave your 9 year old home so you can go to the store in Washington state?

No. Washington state is not only high in criminal kidnappings and break ins but a nine year old is not capable of keeping down a house whilst there parents/gaurdian/parent goes shopping. Also, the legal age is Eleven or Twelve due to the experience and capability they have around that age. You may also want to consider the area you are in before allowing your child to stay home.