Sierra County is a county located in the U.S. state of New Mexico. As of the 2020 Census, the population was 11,576. Its county seat is Truth or Consequences.

Truth or Consequences is a city in the U.S. state of New Mexico, and the county seat of Sierra County. In 2020, the population was 6,052. It has frequently been noted on lists of unusual place names for having chosen to rename itself in March 1950 after the Truth or Consequences radio show. The name is often hyphenated for clarity, though the formal name contains no punctuation.