The principal industries include manufactures of linen and sailcloth, bleaching, rope-making, brewing, distilling, paper-making, in addition to nurseries and freestone quarries.
The industries include the spinning of jute, flax, hemp and cotton, iron-founding, brewing, and the manufacture of machinery, fishing-nets, sailcloth, sacks, casks, and soap. There are also saw-and flour-mills, petroleum refineries and oil-works.
The flax and forests of its extensive territory are mentioned by classical authors, and we find Tarquinii offering to furnish Scipio with sailcloth in 195 B.C. A bishop of Tarquinii is mentioned in A.D.
The principal articles of manufacture have long been sailcloth, cordage, linen and fishing-nets.
In 1890 the operatives in the jute and hemp industry numbered 39,885, and in 1901 they were (including workers in canvas, sacking, sailcloth, rope, twine, mats, cocoa fibre) 46,550.
Other important industries include the making of boilers, steam-engines, locomotives, anchors, chain-cables, sailcloth, ropes, paper, woollen and worsted goods, besides general engineering, an aluminium factory, a flax-spinning mill, distilleries and an oil-refinery.