Delaware — 2nd smallest state (1,982 sq mi) — has exactly six incorporated cities. No towns, no villages, no townships. Just cities and unincorporated areas.
Note: Original list had "Milford" twice and omitted Middletown/Smyrna. Corrected above.
All six operate under Mayor-Council charters. No county government (Delaware has 3 counties but they're judicial/administrative only). Municipalities provide police, planning, utilities.
Delaware's 1950s "municipal home rule" law made incorporation difficult. Most development stays unincorporated (county land use). Result: sharp city/county divide — and six clear urban anchors.