Can I divorce my husband while he is in jail?

If he agrees, it will be easy. If he does not agree, he can hold the divorce up for two years. In addition, as he is in jail, he is indigent and will need to petition the court for counsel which will drag things out. My suggestion is to have him served while he is in jail as it will be hard for him to avoid service. Consult with a lawyer as to the best way to serve him.