Lawrence County, Pennsylvania

Founding: 1849
Parent counties: Beaver and Mercer

Namesake: James Lawrence, U.S. naval officer
Seat: New Castle (1849–)

Land area: 358 square miles

Population (2020): 86,070

Population (historic): 21,079 (1850); 33,312 (1880); 57,042 (1900); 97,258 (1930)

Periods of population growth: pre-1850–1930; 1940–1960

Subdivisions: One city; ten boroughs; seven CDPs; 16 townships

National Register listings: 10

Pre-1940 residences (estimated): 12,571 (30.5%)
Pre-1940 housing survival rate: 54.4%

Farm housing in disrepair (1950): 10.7%

Nonfarm housing in disrepair (1950): 7%
Average farmhouse value (1930): $2,203
Average outbuilding value (1930): $1,607
Average farmhouse size (1940): 6.2 rooms
Number of farms (1920): 2,464
Average farm size (1920): 53.4 acres
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New Castle

Namesake: Unknown

Founding: 1798 (platting); 1812 (post office); 1825 (incorporation)

Population (2020): 21,926

Population (historic): 611 (1840); 1,882 (1860); 8,418 (1880); 28,339 (1900); 48,674 (1930)

Periods of population growth: pre-1840–1930; 1940s
Pre-1940 residences (estimated): 5,769 (49.2%)
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Outstanding Buildings

1. House (c. 1875). 1861 Eastbrook Road. Hickory. Second Empire.
2. *Enoch Marvin Farm (1824–1825). 290 Gilmore Road. Little Beaver. Federal.
3. *William McClelland Farm (c. 1840). 255 McClelland Road. North Beaver. Federal.
4. William Walker Farm (c. 1860). 3534 Marr Road. Pulaski. Italianate.
5. Brown House (c. 1860). 1427 State Route 208. Pulaski.
6. George McCracken Farm (c. 1820). 3093 Perry Highway. Scott. Federal.
7. House (c. 1885). 620 South Market Street. Wilmington. Stick.