Warren County, New Jersey

Founding: 1824
Parent county: Sussex

Namesake: Joseph Warren, Boston revolutionary leader
Seat: Belvidere (1824–)

Land area: 357 square miles

Population (2020): 109,632

Population (historic): 18,627 (1830); 28,433 (1860); 36,589 (1880); 37,781 (1900); 49,319 (1930)

Periods of population growth: pre-1830–1880; 1890–2020

Subdivisions: Three towns; two boroughs; 17 townships

National Register listings: 47

Pre-1940 residences (estimated): 10,943 (24.1%)
Pre-1940 housing survival rate: 79.2%
Pre-1860 housing survival rate (1940): 39.4%

Farm housing in disrepair (1950): 5.4%

Nonfarm housing in disrepair (1950): 4.9%

Average farmhouse value (1930): $2,089
Average outbuilding value (1930): $1,895
Average farmhouse size (1940): 7 rooms
Number of farms (1920): 1,666
Average farm size (1920): 76.7 acres
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Belvidere

Namesake: The Italian word belvidere ("to see beauty")

Founding: 1800 (post office); 1845 (incorporation)

Population (2020): 2,520

Population (historic): 1,001 (1850); 1,882 (1870); 1,784 (1900); 2,073 (1930)

Periods of population growth: pre-1850–1870; 1910–1930; 1940–1970; 1980–2000
Pre-1940 residences (estimated): 628 (52.9%)
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Outstanding Buildings

1. Nelson Cummins House. 249 Alphano Road. Allamuchy.
2. *John Richey Farm (c. 1790). 6 Schnetzer Lane. Franklin. Federal.
3. House (c. 1880). 141 Allamuchy Road. Frelinghuysen.
4. Charles Oberly House. 202 Greenwich Road. Greenwich.
5. *House. 520 North Main Street. Greenwich. Georgian.
6. *Charles Oberly House. 644 South Main Street. Greenwich.
7. *Jesse Stewart Farm. 664 South Main Street. Greenwich.
8. *Henry Kennedy Farm. 813 South Main Street. Greenwich. Georgian.
9. *Robert Kennedy House (c. 1780). 306 State Route 173. Greenwich. Georgian.
10. *Peter Smith House. 717 State Route 173. Greenwich. Federal.
11. *Abraham Van Campen House (c. 1750). Old Mine Road. Hardwick.
12. *John Vass Farm (1812). 109 Stillwater Road. Hardwick. Federal.
13. *Van Nest–Hoff Farm (c. 1780/1800). 3026 Belvidere Road. Harmony.
14. *House (c. 1770). 11 Dogwood Road. Hope.
15. Isaac Read House (c. 1780). 349 Mount Hermon Road. Hope.
16. Farm (c. 1890). 11 Asbury Road. Independence. Eastlake.
17. Miller House (c. 1810/1875). 807 High Street. Independence. Federal/Italianate.
18. *James Ramsay House (c. 1800/1840). 46 Ramseyburg Road. Knowlton.
19. House (c. 1875). 409 Rockport Road. Mansfield. Italianate.
20. William Johnson House (c. 1840). 1029 Rockport Road. Mansfield. Greek Revival.
21. Miller House (c. 1855). 501 State Route 57. Mansfield. Italianate.
22. *George Hunt House (c. 1825). 65 Riegelsville–Warren Glen Road. Pohatcong.
23. *Riegel House (c. 1840). 118 Riegelsville–Warren Glen Road. Pohatcong.
24. Henry Hughes Farm (c. 1825). 337 Riegelsville–Warren Glen Road. Pohatcong.
25. Carpenter Farm. 163 Still Valley Road. Pohatcong.