Rahway, a city of Union co., New Jersey, on Rahway river, here navigable by small craft, at the head of tide, 5 m. above its mouth in Staten Island sound, 16 m. in a direct line S. W. of New York; pop. in 1870, 6,258. It is a station on the Pennsylvania railroad, and another railroad is in course of construction by the Rahway railroad company to connect with New York and Long Branch. The streets are well laid out, and are lighted with gas. There are numerous fine residences, surrounded by handsome gardens. Water works supply the city on the direct pressure plan, obviating the necessity of fire engines. It is chiefly noted for its extensive carriage factories, of which there are 15 or 20. There are also a printing-press manufactory, two wool-scouring establishments, a manufactory of paper hangings, and some minor establishments. The city contains two national banks, several hotels, five public schools, a male and female institute, numerous private schools, a public library of about 5,000 volumes, two weekly newspapers, and 16 churches. - Rahway was first settled about 1720, and was incorporated as a city in 1858.