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

National Register listings: 118

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
_________________________________________________________________________________

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%)
_________________________________________________________________________________



View and filter the data. Or see a larger map.

_________________________________________________________________________________

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.