New Castle County, Delaware


Founding: 1673
Parent county: Unorganized territory
Namesake: The city of New Castle
Seat: New Castle (1664–1881); Wilmington (1881–)
Land area: 426 square miles
Population (2020): 570,719
Population (historic): 19,688 (1790); 33,120 (1840); 63,515 (1870); 109,697 (1900); 161,032 (1930)
Periods of population growth: pre-1790–1800; 1810–2020
Subdivisions: Four cities; six towns; three villages; 13 CDPs
National Register listings: 397
Pre-1940 residences (estimated): 26,905 (11.9%)
Pre-1940 housing survival rate: 50.8%
Pre-1860 housing survival rate (1940): 26.1%
Farm housing in disrepair (1950): 4.3%
Nonfarm housing in disrepair (1950): 4%
Average farmhouse value (1930): $3,988
Average outbuilding value (1930): $4,124
Average farmhouse size (1940): 7.2 rooms
Number of farms (1920): 1,825
Average farm size (1920): 88.9 acres
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New Castle (ex-seat)
 
Namesake: William Cavendish, First Duke of Newcastle
Founding: 1650s (founding as Nieuw Amstel); 1794 (post office)
Population (2020): 5,551
Population (historic): 1,202 (1850); 1,916 (1870); 4,010 (1890); 3,351 (1910); 4,131 (1930)
Periods of population growth: pre-1850–1890; 1910–1950; 1960–1980; 1990–2020
Pre-1940 residences (estimated): 864 (31.7%)
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Wilmington
 
Namesake: Spencer Compton, First Earl of Wilmington
Founding: 1739 (incorporation)
Population (2020): 70,898
Population (historic): 5,268 (1820); 13,979 (1850); 30,841 (1870); 76,508 (1900); 106,597 (1930)
Periods of population growth: pre-1820–1920; 1930s; 1980–2000; 2010s
Pre-1940 residences (estimated): 17,195 (48.5%)
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Outstanding Buildings

  1. *Brook Ramble / James Crawford House (c. 1810). 295 Grear's Corner Road. Appoquinimink. Georgian.
  2. *Fairview / James Moore House (c. 1773). 602 Old State Road. Appoquinimink. Georgian.
  3. *St. Anne's Episcopal Church (1768). 105 St. Anne's Church Road. Appoquinimink. Georgian.
  4. *Richard Lockwood House (c. 1850). 234 St. Anne's Church Road. Appoquinimink. Greek Revival.
  5. *Anthony Naudain House (c. 1725). 5567 Summit Bridge Road. Appoquinimink. Georgian.
  6. *Elias Naudain House (c. 1720). 798 Taylor's Bridge Road. Appoquinimink.
  7. *Francis Perry Farm (c. 1870). 184 Thomas Landing Road. Appoquinimink. Italianate.
  8. *Edmund Liston Farm (c. 1739). End of Cedar Swamp Road. Blackbird. Razed.
  9. *Lombardy Hall / Gunning Bedford House (c. 1750/1790). 1611 Concord Pike. Brandywine. Georgian.
  10. *Thomas Robinson House (c. 1723 and later). 1 Naaman's Road. Brandywine. Greek Revival.
  11. *Robinson–Wertmuller House (c. 1780/1803/1850). 4150 Philadelphia Pike. Brandywine. Federal. Razed.
  12. *Rockwood / Joseph Shipley Estate (1851–1854). 610 Shipley Road. Brandywine. Gothic Revival.
  13. House (c. 1880). 906 Shipley Road. Brandywine. Eastlake.
  14. *David Taylor Farm (c. 1870). 1319 Ashland–Clinton School Road. Christiana. Second Empire.
  15. *Israel Marshall House (1897). 3000 Creek Road. Christiana. Queen Anne.
  16. *Archibald Capelle House (c. 1890). 4400 Kennett Pike. Christiana. Queen Anne.
  17. *Evelina DuPont House (1895). 4400 Kennett Pike. Christiana. Georgian Revival.
  18. *James Carpenter House (c. 1840). 5620 Kennett Pike. Christiana. Italianate.
  19. *Glynrich / Richard Richardson House (c. 1765). 315 North Maryland Avenue. Christiana. Georgian.
  20. *St. Joseph Catholic Church (1841/1848/1878). 8 Old Church Road. Christiana. Federal.
  21. *Cook House (c. 1810). 76 Polly–Drummond Hill Road. Mill Creek. Georgian.
  22. *St. James Episcopal Church (1820–1823). 2113 St. James Church Road. Mill Creek. Federal.
  23. *Bennett Downes House (1816–1817/1870s). 621 DuPont Highway. New Castle. Second Empire. Razed.
  24. *Buena Vista / John Clayton Estate (1845–1847). 661 DuPont Highway. New Castle. Greek Revival.
  25. *Swanwyck / Cora Bauduy House (c. 1815). 132 Linstone Avenue. New Castle. Regency.
  26. *Boothhurst (1842). Wilmington Road and Buttonwood Avenue. New Castle. Gothic Revival/Tudor Revival. Razed.
  27. *Edward Wilson Farm (c. 1860/1900). 521 South College Avenue. Pencader. Italianate.
  28. *Bayard House (c. 1845). 1626 Old Cooch's Bridge Road. Pencader. Greek Revival.
  29. *George Boulden House (c. 1845). Old County Road, east of Frazer Road. Pencader. Greek Revival. Razed.
  30. *LaGrange / Samuel Black Farm (c. 1815). 2475 Pulaski Highway. Pencader. Federal.
  31. *House (c. 1713/1809). 3115 Red Lion Road. Pencader.
  32. *Chelsea / Thomas Clark House (1848). 910 5th Street. Red Lion. Italianate.
  33. *Brady House (c. 1845). 5th Street, west of Dragon Creek. Red Lion. Greek Revival. Razed.
  34. *Fairview / Higgins House (1822/1885–1886). 701 Cox Neck Road. Red Lion. Eastlake.
  35. *John McCoy House (c. 1895). 4185 Kirkwood–St. Georges Road. Red Lion. Eclectic.
  36. *Monterey / George Karsner Farm (c. 1850). 692 Bayview Road. St. Georges. Greek Revival/Italianate.
  37. *Greenlawn / Davis–Brady House (c. 1810/1860). 671 North Broad Street. St. Georges. Gothic Revival. Razed.
  38. *The Maples / George Derrickson Farm (c. 1855). 1023 Bunker Hill Road. St. Georges. Italianate.
  39. *Choptank-Upon-the-Hill / Joshua Clayton House (c. 1820). 121 Colonel Clayton Drive. St. Georges. Federal.
  40. *Old Drawyers Presbyterian Church (1769–1773). 2839 DuPont Highway. St. Georges. Georgian.
  41. *Achmester / Richard Mansfield House (1829 and later). 617 Marl Pit Road. St. Georges. Gothic Revival. Razed.
  42. *Hedgelawn / William Cochran House (1856). 772 Middletown–Warwick Road. St. Georges. Greek Revival. Razed.
  43. *John Cochran Farm (1854). 841 Middletown–Warwick Road. St. Georges. Greek Revival. Razed.
  44. *Farm (late 17th century). 875 Port Penn Road. St. Georges.
  45. *Okolona / Robert Cochran Farm (1866). 1321 Shallcross Lake Road. St. Georges. Italianate.
  46. *Weston / Samuel Brady Farm (c. 1850). 4677 Summit Bridge Road. St. Georges. Italianate.
  47. *Samuel Lindsey House (c. 1875). 693 New London Road. White Clay Creek. Second Empire.
  48. *Samuel Hale House (c. 1750). 606 Stanton–Christiana Road. White Clay Creek.








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