In the 1940s, Delhi was the center of a large natural gas boom, and several functioning gas fields still surround the town. On February 21, 1971, Louisiana's only recorded F5 tornado struck Delhi. It took forty-six lives and was the deadliest F5 tornado to hit the United States since the Jackson, Mississippi, Candlestick Park Tornado five years earlier in 1966 and the earliest confirmed F5 tornado during a year. Later, on May 3, 1999, it lost its record as most destructive tornado in history to the Moore, Oklahoma Tornado. Delhi, originally called Deerfield, is a town in Richland Parish, Louisiana, in the United States. As of the 2000 census, the town population was 3,066.