Delaware is a state in the Mid-Atlantic region of the United States, bordering Maryland to its south and west; Pennsylvania to its north; and New Jersey and the Atlantic Ocean to its east. The state takes its name from the nearby Delaware River named after Thomas West, 3rd Baron De La Warr, an English nobleman and Virginia’s first colonial governor.

Delaware occupies the northeastern portion of the Delmarva Peninsula and some islands and territory within the Delaware River. It is the second smallest and sixth-least populous state, but also the sixth-most densely populated. Delaware’s largest city is Wilmington, while the state capital is Dover, the second-largest city in the state. The state is divided into three counties, having the lowest number of any state; from north to south, they are New Castle County, Kent County, and Sussex County. While the southern two counties have historically been predominantly agricultural, New Castle is more urbanized. Delaware’s geography, culture, and history combine elements of the Mid-Atlantic, Northeastern, and Southern regions of the country.

Before its coastline was explored by Europeans in the 16th century, Delaware was inhabited by several groups of Native Americans, including the Lenape in the north and Nanticoke in the south. It was initially colonized by Dutch traders near the present town of Lewes, in 1631. Delaware was one of the Thirteen Colonies that took part in the American Revolution. On December 7, 1787, Delaware became the first state to ratify the Constitution of the United States and has since been known as The First State. Since the turn of the 20th century, Delaware is also a de facto onshore corporate haven, in which by virtue of its corporate laws, the state is the domicile of over 50% of all NYSE-listed business and 60% of the Fortune 500.

Delaware is home to the 46th and current President of the United States, Joe Biden, who is also the only Delawarean elected to the presidency to date.

Since almost all of Delaware is a part of the Atlantic coastal plain, the effects of the ocean moderate its climate. The state lies in the humid subtropical climate (Cfa) zone. Despite its small size (roughly 100 miles (160 km) from its northernmost to southernmost points), there is significant variation in mean temperature and amount of snowfall between Sussex County and New Castle County. Moderated by the Atlantic Ocean and Delaware Bay, the southern portion of the state has a milder climate and a longer growing season than the northern portion of the state. Delaware’s all-time record high of 110 °F (43 °C) was recorded at Millsboro on July 21, 1930. The all-time record low of −17 °F (−27 °C) was also recorded at Millsboro, on January 17, 1893.

Environment

The transitional climate of Delaware supports a wide variety of vegetation. In the northern third of the state are found Northeastern coastal forests and mixed oak forests typical of the northeastern United States. In the southern two-thirds of the state are found Middle Atlantic coastal forests. Trap Pond State Park, along with areas in other parts of Sussex County, for example, support the northernmost stands of bald cypress trees in North America.

Environmental management

Delaware provides government subsidy support for the clean-up of property “lightly contaminated” by hazardous waste, the proceeds for which come from a tax on wholesale petroleum sales.