The "mother plant" for the four-door Nano was relocated to Sanand in Gujarat state, after the authorities there offered about 1,100 acres for the site.
Tata Motors said in a statement that the company was making arrangements for the "widest possible network" to order the car.
The Gujarat plant will initially make 250,000 Nanos a year, rising to 500,000, Tata said last year.
A number of other car firms also plan vehicles to compete with the Nano, which was unveiled in January 2008, but have not yet begun production.
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