NEW DELHI—Uber Technologies Inc. said it would invest $1 billion in India in the next nine months as it seeks to further expand its business in its largest market outside the U.S. in terms of cities in which it operates.

Amit Jain, the company's India president, said that strong growth in that country made Uber "extremely bullish" and the ride-hailing app expects to hit "over a million trips a day in the next six to nine months."

The company said it aims to have 200,000 drivers in India on its app, which connects riders with available cars, by 2016.

Mr. Jain said in a statement on Friday that the company sees "tremendous potential" in India which is one of its "biggest priorities, along with China and uberPOOL" a service that allows riders to share journeys so far unavailable in India.

The announcement comes just weeks after the company promised to invest $50 million in the next five years in India's technology hub Hyderabad. The investment in the capital the state of Telangana will create "thousands of jobs and entrepreneurship opportunities," Uber said in a statement at the start of this month.

Uber recently ramped up the number of cities served by its app in India from 11 to 18 as it competes with local rivals for market share in a country where car ownership is low and public transport systems unreliable.

The company has faced regulatory roadblocks in India, particularly in Delhi where it and services like it were banned in December after a woman said she was raped by a driver booked through the Uber app. The driver denies wrongdoing and is currently on trial.

After the December ban, Uber, along with local services like it, continued to operate in Delhi and is still locked in a court battle over whether cars on its app are allowed to ply in the capital. A court granted Uber interim relief from the ban earlier this month while it applies for a license to operate in the city.

The company has said it wants to work with authorities and is awaiting rules currently being formulated by the federal government to regulate transport aggregators.

Write to Joanna Sugden at joanna.sugden@wsj.com

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