Lehigh County, Pennsylvania

Founding: 1812
Parent county: Northampton

Namesake: The Lehigh River
Seat: Allentown (1812–)

Land area: 345 square miles

Population (2020): 374,557

Population (historic): 18,895 (1820); 32,479 (1850); 56,796 (1870); 93,893 (1900); 172,893 (1930)

Periods of population growth: pre-1820–2020

Subdivisions: One city; eight boroughs; 12 CDPs; 15 townships

National Register listings: 60

Pre-1940 residences (estimated): 35,521 (24.2%)
Pre-1940 housing survival rate: 77.7%
Pre-1860 housing survival rate (1940): 32.9%

Farm housing in disrepair (1950): 5%

Nonfarm housing in disrepair (1950): 2.5%
Average farmhouse value (1930): $2,651
Average outbuilding value (1930): $2,912
Average farmhouse size (1940): 7 rooms
Number of farms (1920): 2,959
Average farm size (1920): 52.2 acres
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Allentown

Namesake: William Allen, Philadelphia merchant

Founding: 1762 (platting as Northampton); 1803 (post office); 1811 (incorporation)

Population (2020): 125,845

Population (historic): 486 (1790); 1,757 (1830); 13,884 (1870); 35,416 (1900); 92,563 (1930)

Periods of population growth: pre-1790–1970; 1980–2020
Pre-1940 residences (estimated): 18,686 (40.1%)
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Outstanding Buildings

1. *John Burnside House (1748–1749/1818). 1461 Schoenersville Road. Hanover.
2. Jonas Kressley Farm (c. 1865). 4083 Kressley Road. Low Hill. Italianate.
3. Joseph Schmoyer House (remodeled c. 1870). 2158 Cedar Crest Road. Lower Macungie. Gothic Revival.
4. Henry Kemmerer Farm. 2851 Country Club Road. Lower Macungie. Georgian.
5. Valentine Weaver House (c. 1870). 526 Franklin Street. Lower Macungie. Gothic Revival.
6. Charles Baer House (c. 1880). 212 West Main Street. Lower Macungie. Italianate.
7. Daniel Stettler Farm. 3364 Orchard Road. Lower Macungie.
8. Zion Lutheran Church (c. 1900). 8269 Spring Creek Road. Lower Macungie. Romanesque.
9. *Dillingersville School (c. 1885). 7226 Schoolhouse Lane. Lower Milford.
10. Great Swamp Reformed Church (c. 1880). 9150 Spinnerstown Road. Lower Milford. Gothic Revival.
11. Gideon Behler Farm. 8200 Allemaengel Road. Lynn. Georgian.
12. David Holben Farm (remodeled c. 1865). 7927 Bausch Road. Lynn.
13. Lintzport Store (c. 1885). 4609 Golden Key Road. Lynn. Second Empire.
14. Joseph Henry Farm. 5413 Golden Key Road. Lynn. Georgian.
15. *Frederick Leaser Log House (c. 1750). 7654 Leaser Road. Lynn.
16. John Greenawald Farm (c. 1875). 6793 Memorial Road. Lynn. Italianate.
17. Neff's Union Church (1871). 5550 State Route 873. North Whitehall. Romanesque.
18. *Daniel Kemmerer House (c. 1840). 2901 Fish Hatchery Road. Salisbury. Federal.
19. *Log House (c. 1775). 1202 Park Drive. Salisbury.
20. Solomon Walbert Farm (c. 1835). 5123 Chapman's Road. South Whitehall.
21. Koch–Balliet House. 3983 Huckleberry Road. South Whitehall. Federal.
22. App Farm. 2881 Mauch Chunk Road. South Whitehall.
23. *Elias Guth Farm (1830). 2530 Wehr Mill Road. South Whitehall. Federal.
24. *Conrad Meitzler House (c. 1798). 9281 Schantz Road. Upper Macungie. Georgian.
25. *Samuel Grim House (c. 1845). 10543 Schantz Road. Upper Macungie. Greek Revival.
26. Thomas Schmoyer House (c. 1865). 531 Twin Ponds Road. Upper Macungie. Italianate.
27. *Log House (c. 1734/1741). 601 South 4th Street. Upper Milford.
28. Peter Moyer Farm. 4640 Church View Road. Upper Milford. Federal.
29. Jacob Yoder House (18th century). 3653 Jacoby Road. Upper Saucon.
30. Heller House. 5748 Limeport Pike. Upper Saucon. Federal.
31. Weaver House (c. 1840/1870s). 5828 Old Bethlehem Pike. Upper Saucon. Italianate.
32. *Friedensville Union Church (1839). 2451 Saucon Valley Road. Upper Saucon. Federal.
33. William Hoe House. 4483 Vera Cruz Road. Upper Saucon. Georgian.
34. Farm (c. 1880). 4310 Best Station Road. Washington. Italianate.
35. *German Log House (c. 1780). 1781 Main Street. Washington.
36. Lorenz Klein Farm (1826). 1226 Independent Road. Weisenberg. Federal.
37. *Ziegel Union Church (1887–1889). 9990 Ziegel's Church Road. Weisenberg. Romanesque.
38. House. 4698 North Church Street. Whitehall. Georgian.
39. House (c. 1900). 2946 MacArthur Road. Whitehall. Queen Anne/Classical Revival.
40. *Helfrich's Springs Mill (1807). 506 Mickley Road. Whitehall.
41. *John Troxell House (1756). 4229 Reliance Street. Whitehall.