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
National Register listings: 97
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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