Founded in 1688, Somerset County is one of 21 counties in the state of New Jersey. Historically, Somerset County was formed from Middlesex County. The city of Somerville is the county seat. With FIPS code of 35, Somerset County has a population of 345,647 and area of 305 square miles (790 km2).
List of all cities in Somerset County, NJ alphabetically
| City/Town | Postal Code | Area Code |
| Basking Ridge, NJ | 07920 | 908 |
| 07939 | 908 | |
| Bedminster, NJ | 07921 | 908 |
| Belle Mead, NJ | 08502 | 908 |
| Bernardsville, NJ | 07924 | 908 |
| Blawenburg, NJ | 08504 | 609 |
| Bound Brook, NJ | 08805 | 732/848 |
| Branchburg, NJ | 08853 | 908 |
| 08876 | 908 | |
| Bridgewater, NJ | 08807 | 908 |
| East Millstone, NJ | 08873 | 732/848 |
| 08875 | 908 | |
| Far Hills, NJ | 07931 | 908 |
| Finderne, NJ | 08876 | 908 |
| Flagtown, NJ | 08821 | 908 |
| Franklin Park, NJ | 08823 | 908 |
| Franklin Township, NJ | 08873 | 732/848 |
| Gladstone, NJ | 07934 | 908 |
| Hillsborough, NJ | 08844 | 908 |
| Kingston, NJ | 08528 | 609 |
| Liberty Cor, NJ | 07938 | 908 |
| Liberty Corner, NJ | 07938 | 908 |
| Lyons, NJ | 07939 | 908 |
| Manville, NJ | 08835 | 908 |
| Martinsville, NJ | 08836 | 908 |
| Middlebush, NJ | 08873 | 732/848 |
| Millstone, NJ | 08844 | 908 |
| Montgomery, NJ | 08502 | 908 |
| 08558 | 609 | |
| Neshanic Station, NJ | 08853 | 908 |
| North Branch, NJ | 08876 | 908 |
| Peapack, NJ | 07977 | 908 |
| Plainfield, NJ | 07069 | 908 |
| Pluckemin, NJ | 07978 | 908 |
| Raritan, NJ | 08869 | 908 |
| Rocky Hill, NJ | 08553 | 609 |
| Skillman, NJ | 08558 | 609 |
| Somerset, NJ | 08873 | 732/848 |
| 08875 | 908 | |
| Somerville, NJ | 08876 | 908 |
| South Bound Brook, NJ | 08880 | 732/848 |
| South Branch, NJ | 08876 | 908 |
| Warren, NJ | 07059 | 908 |
| Watchung, NJ | 07069 | 908 |
| Zarepath, NJ | 08873 | 732/848 |
| Zarephath, NJ | 08890 | 732/848 |