(i) High density of population.
(ii) Four way roads, flyovers, sky scrapers, parks.
(iii) Educational institution, hospital, Government offices.
(iv) Private and public industries and technological institutions
(v) Employment opportunities, permanent monthly income, basic requirements are the special features of cities.

The occupations in the service sector:
(i) Transport - roadways, railways, waterways, airways
(ii) Communication - Post, Telephone, Information Technology etc
(iii) Trade - Procurement of goods, selling.
(iv) Banking - Money transactions, banking services

On the basis of raw materials, industries are classified as
(i) Agro based industries - Cotton textiles, Sugar mills and Food processing.
(ii) Forest based industries - Paper mills, Furniture making, Building Materials.
(iii) Mineral based industries - Cement industry, Iron industry, and Aluminum Industries.
(iv) Marine based industries - Sea food processing.

(i) Sugar Industry
(ii) Cement Industry
(iii) Manure Industry
(iv) Food Processing Industry
(v) Paper Mills
(vi) Cotton Textiles
(vii) Food Producing Industry
(viii) Weaving Industry
(ix) Furniture Making Industry
(x) Electronic Goods Industry
(xi) Iron Steel Industry
(xii) Integral Coach Factory [ICF]

Primary activities:
(i) Agriculture
(ii) Cattle rearing
(iii) Fishing
(iv) Mining
(v) Collection of fruits, nuts, honey, rubber, resin and medicinal herbs, lumbering.