Delaware does not require paid sick leave. Not required by state law (a state paid leave program covers family and medical leave separately). Some employers still offer it as a benefit, and cities in some states set their own rules.
Paid sick leave in Delaware
Good to know
Paid sick leave and paid vacation are different things. This page covers sick leave. For whether unused vacation must be paid when you leave a job, see Delaware PTO payout rules. This is general information, not legal advice.