Firth is a village in Lancaster County, Nebraska, United States. It is part of the Lincoln, Nebraska Metropolitan Statistical Area. The population was 649 at the 2020 census. According to the United States Census Bureau, the village has a total area of 0.28 square miles, all land. Located in South Pass Township, which is now used as a county precinct, Firth is the s…Firth is a village in Lancaster County, Nebraska, United States. It is part of the Lincoln, Nebraska Metropolitan Statistical Area. The population was 649 at the 2020 census. According to the United States Census Bureau, the village has a total area of 0.28 square miles, all land. Located in South Pass Township, which is now used as a county precinct, Firth is the southernmost community in Lancaster County. Firth is bordered to the east by Big Nemaha Reservoir.