07: Where can I drop off my mail-in ballot in person within Sussex County in Delaware?

According to the Delaware Secretary of State, you may return your absentee ballot to the Department of Elections office in your county:

Sussex County Department of Elections: 119 N. Race St, Georgetown DE 19947 (source)

Phone: (302) 856-5367
Email (Absentee Voting): absenteesc@delaware.gov
Email (Vote By Mail): votebymailsc@delaware.gov