Delaware County, Pennsylvania


Founding: 1789
Parent county: Chester
Namesake: The Delaware River
Seat: Chester (1789–1850); Media (1850–)
Land area: 184 square miles
Population (2020): 576,830
Population (historic): 9,469 (1790); 19,791 (1840); 39,403 (1870); 94,762 (1900); 280,264 (1930)
Periods of population growth: pre-1790–1810; 1820–1970; 1990–2020
Subdivisions: One city; 27 boroughs; ten CDPs; 21 townships
Pre-1940 residences (estimated): 49,106 (21.8%)
Pre-1940 housing survival rate: 62.9%
Pre-1860 housing survival rate (1940): 43.4%
Farm housing in disrepair (1950): 3.4%
Nonfarm housing in disrepair (1950): 2.4%
Average farmhouse value (1930): $6,040
Average outbuilding value (1930): $8,180
Average farmhouse size (1940): 7.4 rooms
Number of farms (1920): 1,287
Average farm size (1920): 46.3 acres
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Chester (ex-seat)
 
Namesake: Chester, England
Founding: pre-1682 (founding as Upland); 1682 (incorporation); 1775 (post office)
Population (2020): 32,605
Population (historic): 657 (1820); 1,667 (1850); 9,485 (1870); 33,988 (1900); 59,164 (1930)
Periods of population growth: pre-1820–1950
Pre-1940 residences (estimated): 5,066 (35.7%)
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Media
 
Namesake: The borough's central location within Delaware County
Founding: 1850 (platting); 1850 (incorporation); 1852 (post office)
Population (2020): 5,901
Population (historic): 285 (1850); 1,045 (1870); 2,736 (1890); 3,562 (1910); 5,372 (1930)
Periods of population growth: 1850s; 1870–1930; 1940–1970; 2010s
Pre-1940 residences (estimated): 1,088 (35.4%)
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Outstanding Buildings

  1. Stonehaven / John Lundgren House (1799/1811). 484 Lenni Road. Aston.
  2. John Chamberlain House (1722/1798). 1722 Walnut Hill Boulevard. Aston.
  3. House (1881). 360 Valleybrook Road. Aston. Gothic Revival.
  4. Painter's Folly / Samuel Painter House (1856–1857). 1421 Baltimore Pike. Birmingham. Italianate.
  5. Thomas Clark House (1731). 1509 Baltimore Pike. Birmingham.
  6. John Chadds Farm (1713). 1719 Creek Road. Birmingham.
  7. William Brinton House (1704). 21 Oakland Road. Birmingham.
  8. George Crozer House (1869). 280 6th Street. Chester. Italianate.
  9. Newlin Mill (1704). 213 Cheyney Road. Concord.
  10. Isaac Kimber House (c. 1735/1820). 278 Concord Road. Concord.
  11. Pont Reading / Joshua Humphreys House (c. 1683/1813/1830). 2713 Haverford Road. Haverford. Federal.
  12. The Grange / Henry Lewis House (c. 1750/1855). 143 Myrtle Avenue. Haverford. Gothic Revival.
  13. Thomas Massey House (1696/1735/1860). 469 Lawrence Road. Marple.
  14. Thomas Leiper House (c. 1785). 541 Avondale Road. Nether Providence. Georgian.
  15. Westlawn / Charles Essig House (1882). 123 Providence Road. Nether Providence. Queen Anne.
  16. Todmorden / William Crook House (1787). 6 Todmorden Lane. Nether Providence. Georgian.
  17. Square Tavern / John West House (1742). 252 Newtown Road. Newtown.
  18. St. David's Episcopal Church (1715). Valley Forge Road, north of Church Road. Newtown. Georgian.
  19. Glenays / Richard Montgomery House (1859/1925). 926 Coopertown Road. Radnor. Italianate.
  20. Morton Mortonsen Log House (c. 1654/1698). 100 Lincoln Avenue. Ridley.
  21. Morton Morton House (c. 1750). 517 Winona Avenue. Ridley.
  22. Bethlehem Methodist Church (1891). 4 Westtown Road. Thornbury. Gothic Revival.
  23. Log House (c. 1645). End of Creek Road, near Darby Creek. Upper Darby.
  24. Collen Brook Farm / Lewis House (c. 1700/1774/1794). 1030 Mansion Road. Upper Darby. Georgian.
  25. Rose Tree Tavern (1809/1836). 1501 Providence Road. Upper Providence. Georgian.
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