Monroe is a city in Sevier County, Utah, United States. The population was 2,256 at the 2010 United States Census. The city is home to both Mystic Hot Springs and South Sevier High School.
Monroe is located in rural central Utah, at 38°37′46″N 112°7′13″W / 38.62944°N 112.12028°W / 38.62944; -112.12028 (38.629338, -112.120275). According to the United States Census Bureau, the city has a total area of 3.5 square miles (9.2 km²), all of it land. Monroe is bordered by mountains on the east and south, and farmers fields to the west and north.
Monroe is home to naturally occurring hot springs with travertine deposits, a result of the Monroe-Red Hill geothermal system found along the Sevier fault. On the east side of town, hot water surfaces at a temperature of 168°F and a rate of about 200 gallons per minute. A travertine mound has formed, known as the Monroe Mound. This deposit stretches one mile across, 200 yards wide, and a few hundred feet thick. There is another hot water source about a mile north of town called the Red Hill Hot Springs. It also surfaces at 168°F, but at a rate of about 100 gallons per minute. The Red Hill mound is about one-third of a mile across, and deep red in color.