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List of counties in Delaware

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Counties of Delaware
Delaware counties.png
Location State of Delaware
Number 3
Populations 162,310 (Kent) – 538,479 (New Castle)
Areas 494 square miles (1,280 km2) (New Castle) – 1,196 square miles (3,100 km2) (Sussex)
Government County government
Subdivisions Municipality

The United States state of Delaware has only three counties: New Castle, Kent, and Sussex, the least in the United States.[1] The origin of the county boundaries goes back to former court districts. The powers of the counties' legislative bodies are limited to issues such as zoning and development.

Politics and government

Each county elects a legislative body (known in New Castle and Sussex counties as the County Council, and in Kent County as the Levy Court). The counties are able to raise taxes and borrow money. They also have control over garbage disposal, water supply, sewerage, zoning, development, and building codes.[2]

Most functions which are handled on a county-by-county basis in other states—such as court and law enforcement—have been centralized in Delaware, leading to a significant concentration of power in the Delaware state government. The counties were historically divided into hundreds, which were used as tax reporting and voting districts until the 1960s. However, the hundreds now serve no administrative role; their only current official legal use is in real-estate title descriptions.[3]


Following the English conquest of 1664, all of the land on the western side of the Delaware River and Delaware Bay was governed as part of the New York Colony and administered from the town of New Castle. During the brief recapture of the colony by the Dutch in 1673, additional court districts were created around Upland and Whorekill.[4] The latter was also known as Hoornkill, and is now the town of Lewes.[5] The court at New Castle was left with the central portion of the colony. The jurisdiction left to the court at became New Castle County, and the county seat remained at New Castle until 1881 when it was moved to Wilmington. In 1680, Whorekill District was divided into Deale County and St. Jones County.[6] After this division, Lewes became the county seat of Deale, which was later renamed Sussex County.[6] The former Upland District was named after the New Sweden settlement of Upland, and was renamed Chester County in 1682.[7] Chester County is now located within the present boundaries of Pennsylvania.[8]

Lord Baltimore, the Proprietor of Maryland, claimed all present-day Delaware, and organized its northern and eastern portions as Durham County, Maryland. However, this county existed only on paper. The southern and western portions of present-day Sussex County were organized as portions of several adjacent Maryland counties and were not recognized as part of Delaware until the Mason-Dixon Survey was run in 1767.[9] In 1791, with the expansion of Sussex County to the south and west, the county seat was moved to Georgetown.[6] The county seat of St. Jones (renamed Kent County in 1681[6]) is at Dover.[6]

After 2000, a fourth "Appoquinimink County" was proposed to be carved out of New Castle County. The motivation for this failed[why?] effort was to end the zoning restrictions of the Unified Development Code on the undeveloped farmland.[10] The proposed boundaries extended beyond Appoquinimink Hundred to include all land south of the C&D Canal with Middletown as the proposed seat.

County information

The Federal Information Processing Standard (FIPS) code, which is used by the United States government to uniquely identify counties, is provided with each entry. The FIPS code for each county links to census data for that county.

FIPS County Code
County seat
Kent County 001 Dover 1680 Created from Whorekill (Hoarkill) District. Formerly known as St. Jones County. named in 1682 by William Penn for the English county of Kent 162,310 800 sq mi
(2,072 km2)
State map highlighting Kent County
New Castle County 003 Wilmington 1664 Original County (Formally New Amstel) named in 1673 by Dutch Governor Anthony Colve for the town of New Castle, Delaware as an Anglicization of Nieuw Amstel. 538,479 494 sq mi
(1,279 km2)
State map highlighting New Castle County
Sussex County 005 Georgetown 1664 Created from Whorekill (Hoarkill) District. Formerly known as Deale County named in 1682 by William Penn for the English county of Sussex, which was his home county 197,145 1,196 sq mi
(3,098 km2)
State map highlighting Sussex County


  1. "How Many Counties are in Your State?". Click and Learn. Retrieved 2009-08-26.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  2. "Chapter Title 9 Counties". Online Delaware Code. Government of Delaware.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  3. "The Hundreds of Delaware: 1700 - 1800, Delaware Department of State:Division of Historical and Cultural Affairs website". The Official Website of the Government of Delaware. Government of Delaware. Archived from the original on 2008-02-20. Retrieved 2008-02-25.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  4. The Historical Society of Delaware (1997). "Delaware Counties". Retrieved 2006-06-01.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  5. Hazel D. Brittingham (1997). "The Name of Whorekill". Lewestown Publishers. Retrieved 2007-04-24.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  6. 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 Delaware Genealogical Society (1997). "Delaware Counties and Hundreds". Delaware Genealogical Society. Retrieved 2006-06-01.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  7. J. Thomas Scharf and Thompson Westcott. "History of Philadelphia 1609-1884". Philadelphia Water Department. Retrieved 2008-02-24. line feed character in |chapter= at position 11 (help); |chapter= ignored (help)<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  8. "Chester County website". Retrieved 2008-04-02.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  9. John Mackenzie. "A brief history of the Mason-Dixon survey line". University of Delaware. Retrieved 2007-04-24.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  10. "Unified Development Code". New Castle County. Archived from the original on December 16, 2004. Retrieved 2008-10-01.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  11. "EPA County FIPS Code Listing". Retrieved 2008-02-23.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  12. 12.0 12.1 12.2 National Association of Counties. "NACo - Find a county". Archived from the original on April 10, 2005. Retrieved 2008-04-30.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  13. 13.0 13.1 The Historical Society of Delaware (1997). "Delaware Counties". Retrieved 2006-06-01.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  14. Delaware Census Data

External links