New Meadows is a rural city in Adams County, Idaho, United States, at the southern and upper end of the Meadows Valley, on the Little Salmon River. Located in the west central part of the state, just south of the 45th parallel, the population was 496 at the 2010 census, down from 533 in 2000. New Meadows is located at the junction of the primary north-south highway in the state, U.S.