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List of Counties in Delaware

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Delaware has 3 counties, the fewest of any state. These are New Castle County (Wilmington), Kent County (Dover), and Sussex County (Georgetown). New Castle County is by far the most populous and is the economic hub of the state, containing Wilmington, which is home to numerous banks and corporations. Sussex County, known for its beaches and tourism, is growing quickly, while Kent County includes the state capital, Dover.

List of All Counties in Delaware

  1. Kent County, Delaware
  2. New Castle County, Delaware
  3. Sussex County, Delaware

1. Sussex County

Overview

Sussex County is the largest county in Delaware by land area, located in the southernmost part of the state. It is bordered by Maryland to the west and south, the Atlantic Ocean to the east, and Kent County to the north. Sussex County is known for its agricultural economy, particularly poultry farming, and its coastal communities, which attract tourists throughout the year. The county is home to popular beach towns like Rehoboth Beach, Bethany Beach, and Lewes. Historically, Sussex County was settled by the Dutch in the 17th century before coming under English control. Over time, the county has evolved from its agricultural roots into a mixed economy that includes tourism and manufacturing.

County Facts

  • Population: Approximately 250,000 (2023 estimate)
  • County Seat: Georgetown
  • Major Airports: Delaware Coastal Airport (Georgetown)
  • Major Highways: US-9, US-13, DE-1, DE-404

2. Kent County

Overview

Kent County is centrally located in Delaware, bordered by Sussex County to the south and New Castle County to the north. It is also bordered by the Delaware Bay to the east and Maryland to the west. Dover, the state capital, serves as the county seat and is a central economic and cultural hub for the county. Kent County’s economy is diverse, with key sectors including government, agriculture, and manufacturing. Dover Air Force Base, one of the largest military facilities in the United States, is a significant contributor to the local economy. Established in 1680, Kent County has a rich history, playing a pivotal role in Delaware’s colonial and early statehood periods. Today, it offers a mix of urban and rural lifestyles, with scenic farmland and growing suburban communities.

County Facts

  • Population: Approximately 190,000 (2023 estimate)
  • County Seat: Dover
  • Major Airports: Dover Air Force Base (military), Delaware Airpark (civilian)
  • Major Highways: US-13, DE-1, US-113, DE-8

3. New Castle County

Overview

New Castle County is located in the northernmost part of Delaware and is the most populous county in the state. It is bordered by Pennsylvania to the north, Maryland to the west, and New Jersey across the Delaware River to the east. Wilmington, the largest city in Delaware, serves as the county seat and is a major financial and cultural center. New Castle County is the economic engine of Delaware, home to numerous corporations, particularly in the banking and chemical industries. The county’s history dates back to its settlement by the Dutch in the 17th century, followed by Swedish and English colonization. New Castle County played a central role in the American Revolution and early American industry. Today, it remains a vital hub for commerce, transportation, and education.

County Facts

  • Population: Approximately 570,000 (2023 estimate)
  • County Seat: Wilmington
  • Major Airports: Wilmington Airport (ILG)
  • Major Highways: I-95, I-295, I-495, US-13, DE-1

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