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
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: 1655 (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: 1730 (platting as Willingtown); 1731 (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

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