How many counties are there in Utah? As of 2024, there are a total of 29 counties in the state of Utah. Among them, Salt Lake County is the oldest one (established in 1849) while Daggett County is the youngest (established in 1919). With population of 1,029,665, Salt Lake County is the most populated. The biggest county by land area is San Juan County (20,254 km²) and the smallest is Davis County (774 km²).
