State Department spokesman John Kirby also said yesterday that 15,000 Syrian refugees have been referred to the US for resettlement by the UN refugee agency.
In December, Washington had said it had received 9,000 referrals from the UN.
It had also previously said it would admit between 1,000 to 2,000 Syrian refugees in fiscal year 2015, and increase that number by a few thousand in fiscal year 2016.
The United States has been criticised for not taking more of the estimated four million refugees fleeing the civil war that began in 2011.
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"And so, what we're really committed to is helping to foster the kind of political transition inside Syria, so that it is a safe environment for Syrian people to return, including the millions that are seeking refuge in Turkey right now," he added.
The US has contributed USD 4 billion in humanitarian aide to those affected by the Syrian violence since 2011.
UN High Commissioner for Refugees Antonio Guterres has said that the number of Syrian refugees surpassed four million in July and was expected to grow to 4.27 million by the end of the year.