Middlesex County, New Jersey

Founding: 1683
Parent county: Unorganized territory
Namesake: Middlesex, England
Seat: New Brunswick (1778–)
Land area: 309 square miles
Population (2020): 863,162
Population (historic): 15,956 (1790); 21,893 (1840); 45,029 (1870); 79,762 (1900); 212,208 (1930)
Periods of population growth: pre-1790–1830; 1840–2020
Subdivisions: Three cities; 12 boroughs; 24 CDPs; ten townships
Pre-1940 residences (estimated): 32,756 (10.8%)
Pre-1940 housing survival rate: 57.7%
Pre-1860 housing survival rate (1940): 24.8%

Farm housing in disrepair (1950): 7.9%

Nonfarm housing in disrepair (1950): 4.2%

Average farmhouse value (1930): $3,794
Average outbuilding value (1930): $3,332
Average farmhouse size (1940): 6.4 rooms
Number of farms (1920): 1,383
Average farm size (1920): 50.8 acres
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New Brunswick

 
Namesake: Brunswick, Germany
Founding: 1730 (platting); 1776 (post office); 1784 (incorporation)
Population (2020): 55,266
Population (historic): 5,866 (1840); 11,256 (1860); 17,166 (1880); 20,005 (1900); 34,555 (1930)
Periods of population growth: pre-1840–1930; 1940–1970; 1980–2020
Pre-1940 residences (estimated): 2,549 (15.1%)
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Outstanding Buildings

1. Francis Holmes House (c. 1860). 290 Rhode Hall Road. Monroe. Italianate.
2. Thomas Agnew House (1844). 2 Crest Road. North Brunswick. Greek Revival.
3. Ivy Hall / Cornelius Low House (1741). 1225 River Road. Piscataway. Georgian.
4. Bodine–Phillips–Knapp House (1728/1850s/1870s). 1281 River Road. Piscataway. Italianate.
5. Isaac Withington Estate (1850–1852). 14 Spruce Lane. South Brunswick. Renaissance Revival.

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