"US congratulates BJP on its victory in India's historic election; we look forward to working govt once formed to advance our partnership," the National Security Council (NSC) of the White House said in a tweet.
US President Barack Obama had earlier this week said he is looking forward to working "closely" with the next government in India to make the coming years "equally transformative" for the two countries.
"We look forward to the formation of a new government once election results are announced and to working closely with India's next administration to make the coming years equally transformative," Obama said in a statement on Tuesday.
India has set an example for the world in holding the largest democratic election in history, which he said was "a vibrant demonstration of our shared values of diversity and freedom".
"The United States and India have developed a strong friendship and comprehensive partnership over the last two decades, which has made our citizens safer and more prosperous and which has enhanced our ability to work together to solve global challenges," he said.