It has been represented by Democrat Laura Sturgeon since 2018, following her defeat of incumbent Republican Gregory Lavelle.

[3] District 4 covers many of Wilmington's northwestern suburbs in New Castle County, including Hockessin, Greenville, Pike Creek, Talleyville, Granogue, Brandywine, Alapocas, Montchanin, Runnymeade, Delaware Heights, Rockland, Winterthur, Wooddale, and other unincorporated areas.

It overlaps with the 4th, 12th, 21st, and 22nd districts of the Delaware House of Representatives.

[1] Delaware Senators are elected to staggered four-year terms.

Under normal circumstances, the 4th district holds elections in midterm years, except immediately after redistricting, when all seats are up for election regardless of usual cycle.