Amboy is a city in Lee County, Illinois, United States, along the Green River. The population was 2,561 at the 2000 census. The chain of Carson Pirie Scott & Co. began in Amboy when Samuel Carson opened his first dry goods store there in 1854. The Christian denomination Community of Christ, formerly the Reorganized Church of Jesus Christ of Latter day Saints, had a general conference in Amboy on April 6, 1860, at which time Joseph Smith III reorganized the church founded by his father Joseph Smith, Jr.