The alphamegalog of the cities of Delaware lists the largest city in Delaware for each letter of the alphabet. In this case, ‘largest’ is based on population within the city proper.

Arden
Bear
Claymont
Dover
Elsmere
Felton
Glasgow
Hockessin
(no I)
(no J)
Kent Acres
Laurel
Middletown
Newark
Oceanview
Pike Creek Valley
(no Q)
Rising Sun Lebanon
Smyrna
Townsend
(no U)
Viola
Wilmington
(no X)
(no Y)
(no Z)