Students find the following Delaware state facts in this printble: Delaware state abbreviation: DE. Delaware state census region: South Atlantic. Delaware state area (sq miles): 2,489. Delaware state capital: Dover. Delaware state population: 897,934. Delaware state motto: Liberty and independence. Delaware state song: "Our Delaware". Delaware state bird: Delaware Blue Hen. Delaware state flower: Peach Blossom. Delaware state tree: American Holly. Delaware state insect: 7-spotted ladybug (state bug), Eastern tiger swallowtail (state butterfly). Delaware state mammal: Gray fox (2010) - land mammal.