Welcome sign in Monroe, Utah, United States. – Ken Lund, CC BY-SA 2.0 – Wikimedia Commons Monroe is located in Sevier County. About 2,515 people live here (as of 2020). Between 2010 and 2020, the population grew from 2,256 to 2,515. The region is at 1644 meters above sea level. The area covers about 9.3 square kilometers. There are about 94 streets in Monroe. The region was founded in 1864. The postal codes are 84754. The dialing code is 435. The name originates from James Monroe (president of the United States from 1817 to 1825) Monroe is city in Sevier County, Utah, United States. Among other things, Monroe has supermarkets, schools and banks.