Mercer County, New Jersey

Founding: 1838
Parent counties: Burlington, Hunterdon, and Middlesex

Namesake: Hugh Mercer, Continental Army general
Seat: Trenton (1838–)

Land area: 225 square miles

Population (2020): 387,340

Population (historic): 21,502 (1840); 37,419 (1860); 58,061 (1880); 95,365 (1900); 187,143 (1930)

Periods of population growth: pre-1840–2020

Subdivisions: One city; four boroughs; nine CDPs; seven townships

Pre-1940 residences (estimated): 34,897 (24.2%)
Pre-1940 housing survival rate: 63%
Pre-1860 housing survival rate (1940): 40%

Farm housing in disrepair (1950): 9.9%

Nonfarm housing in disrepair (1950): 4.9%

Average farmhouse value (1930): $3,695
Average outbuilding value (1930): $2,608
Average farmhouse size (1940): 7 rooms
Number of farms (1920): 1,330
Average farm size (1920): 66.5 acres
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Trenton

Namesake: William Trent, Philadelphia merchant

Founding: 1719 (platting); 1792 (incorporation)

Population (2020): 90,871

Population (historic): 1,946 (1790); 3,925 (1830); 17,228 (1860); 57,458 (1890); 123,356 (1930)

Periods of population growth: pre-1790–1820; 1830–1950; 2010s
Pre-1940 residences (estimated): 20,686 (59.7%)
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Outstanding Buildings

1. Isaac Pullen House (c. 1865). 866 Old York Road. East Windsor. Italianate.
2. William Green House (c. 1717/1830). Metzger Drive. Ewing.
3. Grafton House (c. 1870). 110 Edgebrook Road. Hamilton. Italianate.
4. Isaac Pearson House (1773). Hobson Avenue, south of Emeline Avenue. Hamilton. Georgian.
5. Bow Hill / Barnt DeKlyn House (c. 1790). 477 Jeremiah Avenue. Hamilton. Federal.
6. John Abbott House (c. 1730/1830). 2200 Kuser Road. Hamilton.
7. Isaac Watson House (1708). 151 Westcott Avenue. Hamilton.
8. John Burroughs Farm (c. 1800). 1132 Bear Tavern Road. Hopewell. Georgian.
9. Hunt Farm (c. 1760/1860). 197 Blackwell Road. Hopewell.
10. Ichabod Leigh House (c. 1835). 953 Cherry Valley Road. Hopewell. Greek Revival.
11. Phillips House (c. 1860). 26 Featherbed Lane. Hopewell. Italianate.
12. Stout House (c. 1810). 130 Hopewell–Rocky Hill Road. Hopewell. Federal.
13. Joseph Stout Farm (1752). 595 Province Line Road. Hopewell. Georgian.
14. Edward Van Dyke Farm (c. 1865). 73 Washington Avenue. Hopewell. Italianate.
15. Garret Johnson House (c. 1740). 355 Washington Crossing–Trenton Road. Hopewell.
16. John White House (c. 1800). 100 Cold Soil Road. Lawrence. Georgian.
17. William Gulick House (c. 1860). 3641 Lawrenceville Road. Lawrence. Italianate.
18. James Brearley House (1761). 100 Meadow Road. Lawrence. Georgian.
19. George Johnston House (c. 1875). 2685 Princeton Pike. Lawrence. Second Empire.
20. Tusculum / John Witherspoon Estate (1773). 166 Cherry Hill Road. Princeton. Georgian.
21. Gulick House (c. 1800). 7 Herrontown Road. Princeton. Georgian.
22. Josiah Worth House (c. 1800). 619 Lawrenceville Road. Princeton. Georgian.
23. John Cox House (c. 1820). 3801 Lawrenceville Road. Princeton. Federal.
24. Thomas Clarke House (c. 1772/1840). 500 Mercer Road. Princeton.
25. John Clarke Farm (c. 1800/1875). 354 Quaker Road. Princeton. Federal/Italianate.
26. Stony Brook Friends Meeting House (1760). 470 Quaker Road. Princeton.
27. Maybury Hill / Hewes House (c. 1730/1753). 346 Snowden Lane. Princeton. Georgian.
28. Robbins House (c. 1820). 245 Windsor Road. Washington. Federal.
29. James Hutchinson House (c. 1785). 66 Line Road. West Windsor. Georgian.
30. John Rogers House (1761). Paxson Avenue. West Windsor.

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