| Capital: | New Brunswick |
|---|---|
| Origen y Formación del condado: | One of four original counties created in East Jersey |
| Población: | 809,858 habitantes |
| Densidad: | 2 habitantes/Sq mi |
| Área: | 311 sq mi |
| Localización del condado dentro de New Jersey: |
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Localidades en Middlesex, New Jersey
- Avenel
- Brownville
- Carteret
- Clearbrook Park
- Colonia
- Concordia
- Cranbury Cdp
- Cranbury Township
- Dayton
- Deans
- Dunellen
- East Brunswick
- Edison
- Fords
- Heathcote
- Helmetta
- Highland Park
- Hopelawn
- Iselin
- Jamesburg
- Keasbey
- Kendall Park
- Kingston
- Laurence Harbor
- Madison Park
- Menlo Park
- Menlo Park Terrace
- Metuchen
- Middlesex
- Middlesex-county-ontario
- Milltown
- Monmouth Junction
- Monroe Township Middlesex County
- New Brunswick
- North Brunswick Township
- Old Bridge Cdp
- Old Bridge Township
- Parlin
- Perth Amboy
- Piscataway
- Plainsboro Center
- Plainsboro Township
- Port Reading
- Princeton Meadows
- Raritan Landing
- Rossmoor
- Sayreville
- Sewaren
- Society Hill Middlesex County
- South Amboy
- South Brunswick Township
- South Plainfield
- South River
- Spotswood
- Whittingham
- Woodbridge
- Woodbridge Cdp