The 2014 Murrieta, California, population is 102,345. There are 3,048 people per square mile (population density). The median age is 32.4. The US median is 37.2. 57.52% of people in Murrieta, California, are married. 9.42% are divorced. The average household size is 3.23 people. 43.57% of people are married, with children. 14.57% have children, but are single.