New Castle County, Delaware Genealogy

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United States > Delaware > New Castle County

County Courthouse

The New Castle County Government Center
87 Reads Way
New Castle, DE 19720-1648


1638 Swedes and Finns settle at Fort Christiana (now Wilmington).[1][2] They eventually spread as far north as Philadelphia. See New Sweden wiki article for more details.
1651 Dutch build Fort Casimir and Sandhook (now New Castle City).[3][4][5] See New Netherland article for details.
1654 New Sweden captures Fort Casimir without a fight. It is renamed Fort Trinity (Trefaldighets).
1655 New Netherland returns a large army and forces all of New Sweden to submit to Dutch rule.
1664 As part of the Second Anglo-Dutch War New Netherland is surrendered to England.
1673 A new war breaks out. The Dutch send a huge armada to recapture New Netherland, but at the end of 1674 it is finally ceded to England.[6] Nieuw Amstel is renamed New Castle after the English take control.

Parent County

1673 New Castle County was created 8 August 1673 from New Amistel (old) County. County seat: Wilmington [7]

Boundary Changes

Record Loss

Places / Localities

Populated Places

  • Cities: Delaware City . New Castle . Newark . Wilmington
  • Towns: Bellefonte . Elsmere . Middletown . Newport . Odessa . Smyrna . Townsend
  • Villages: Arden . Ardencroft . Ardentown
  • Hundreds: Appoquinimink . Blackbird . Brandywine . Christiana . Mill Creek . New Castle . Pencader . Red Lion . St. George's . White Clay . Wilmington
  • Unincorporated communities: Bear . Blackbird . Brookside . Centreville . Christiana . Claymont . Edgemoor . Elmhurst . Glasgow . Greenville . Gwinhurst . Hockessin . Kirkwood . MacDonough . Manor . Marshallton . Minquadale . Montchanin . North Star . Pike Creek . Port Penn . Rockland . St. Georges . Stanton . Talleyville . Tybouts Corner . Wilmington Manor .Winterthur . Yorklyn

Neighboring Counties






  • United States Geographic Survey Place Names - GNIS for New Castle County
    (may not always be present in alphabetic order on first try.)


Local Histories






Vital Records

Societies and Libraries

Web Sites


  1. Amandus Johnson, "Detailed Map of New Sweden 1638-1655" in Amandus Johnson's book The Swedes on the Delaware 1638-1664 (Philadelphia: Swedish Colonial Society, 1915), 392.
  2. John A. Munroe, Colonial Delaware: A History] (Millwood, N.Y.:KTO Press, 1978) [FHL book 975.1 H2mu], 16-18. “From there they proceeded according to instructions up the Delaware and into the Christina River, the Minquas Kill to the Dutch. Here, after reconnoitering the stream, Minuit met with Indians and purchased lands from Duck Creek (the southern boundary of New Castle County) to the Schuylkill. Here too a site was picked for a settlement that was called Fort Christina. It was at the Rocks, ‘a wharf of stone’ on the Christina about two miles from the Delaware River and above the junction of the Christina and its main tributary, the Brandywine, on the east side of the present city of Wilmington.”
  3. Johnson, Detailed Map.
  4. "Fort Casimir" in Wikipedia: the Free Encyclopedia at (accessed 7 November 2008).
  5. Philip S. Klein, and Ari Hoogenboom, "A History of Pennsylvania, 2nd ed." (University Park, Penn.: Penn State Press, 1980; digitized by Google at, 11.
  6. "New Netherland" in Wikipedia: the Free Encyclopedia at (accessed 13 December 2008).
  7. The Handybook for Genealogists: United States of America,10th ed. (Draper, UT:Everton Publishers, 2002).