Resident Population in Lamb County, TX was 12.68700 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Lamb County, TX reached a record high of 18.66900 in January of 1980 and a record low of 12.68700 in January of 2024. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Lamb County, TX - last updated from the United States Federal Reserve on April of 2026.