Middlesex County, New Jersey Genealogy

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Template:New Jersey-stubUnited States  > New Jersey > Middlesex County

County Courthouse


Parent County

  • 1675, original part of East Jersey
  • 1 March 1683, created as a county from the Colonial lands. [1]

Boundary Changes

  • 26 May 1688, part taken for Somerset County.[1]
  • 1710, some boundary changes
  • 1714, part of Somerset County taken back
  • 1790, some boundary changes with Somerset County
  • 1822, water boundary established
  • 22 February 1838, West Windsor and part of East Windsor twps. to Mercer County.[1]
  • 1844, part of Monroe twp. to Monmouth County
  • 1844, part of Monroe twp. to Monmouth County and returned in 1845
  • 1847, piece of Monroe twp. to Monmouth County
  • 1850, part of Franklin twp. of Somerset County to North Brunswick twp.; water boundary clarified
  • 1855, some changes to boundary with Somerset County and again in 1858
  • 1860, part of Woodbridge twp. to Rahway, Union County
  • 1871, boundary with Plainfield, Union County changed
  • 1878, boundary at Kingston, Somerset County clarified
  • 1892, water boundary further clarified
  • 1939, land to Matawan, Monmouth County.

Record Loss


Populated Places

Neighboring Counties

Mercer | Monmouth | Somerset | Union | Richmond (Staten Island) county, New York




LDS Ward and Branch Records

  • New Brunswick




Middlesex County Land Records Search website
Middlesex County land records are freely searchable online back to January 1950. Watermarked copies are free to print; printing clean copies is a paid service. Cookies must be enabled for the site to function properly and be sure to read the User Guide.



Early migration routes to and from Middlesex County, New Jersey Genealogy for settlers included:[2]




Obtaining Copies of County Probate Records

Copies of recorded probate records and the estate files can be obtained from the surrogate's offices for a fee. Addresses of surrogate's offices are found in:

  • Eichholz, Alice, Editor. Ancestry's Red Book: American State, County, and Town Sources. Revised Edition. Salt Lake City, Utah: Ancestry, 1992. (Family History Library book 973 D27rb 1992.) Explains state-by-state history, vital records, census, background sources, periodicals, archives, libraries, societies, maps, land, probate, court, tax, cemetery, church, and military records. Includes county boundary map and table which shows when each county was created and the parent counties.

In addition, copies of the original wills, administrations, inventories, and guardianships sent to Trenton since 1901 can be ordered from:

Clerk of the Superior Court
Records Information Center
P.O. Box 967
Trenton, NJ 08625-0967
Telephone: 609-292-4978
Fax: 609-777-0094
Internet: http://www.answers.com/topic/new-jersey-superior-court


Vital Records

Societies and Libraries

Family History Centers

Web Sites

  • USGenWeb project. May have maps, name indexes, history or other information for this county. Select the state, then the county.
  • Family History Library Catalog


  1. 1.0 1.1 1.2 Handybook for Genealogists: United States of America, 10th ed. (Draper, Utah: Everton Pub., 2002), 181. [FHL book 973 D27e 2002]. Cite error: Invalid <ref> tag; name "HBG" defined multiple times with different content Cite error: Invalid <ref> tag; name "HBG" defined multiple times with different content
  2. Handybook, 847-61.