It has been represented by Democrat Jack Walsh since 2016, succeeding fellow Democrat Karen Peterson.

[3] District 9 covers the areas between Newark and Wilmington in New Castle County, including parts of Pike Creek, Pike Creek Valley, Newport, Stanton, and far eastern Newark proper.

It overlaps with the 17th, 18th, 19th, 21st, and 24th districts of the Delaware House of Representatives.

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

Under normal circumstances, the 9th district holds elections in presidential years, except immediately after redistricting, when all seats are up for election regardless of usual cycle.