From a total population of 19,912, Mountlake Terrace has a median age of 37.2. The average age of males, in Mountlake Terrace, is 34.8 while the average age of females is 40.8. When you compare this to median age of Washington, Mountlake Terrace is 0.2 years younger.
The median income of individuals, in Mountlake Terrace, is $30,104 while the average household income is $61,477. When comparing the median income of people living in Mountlake Terrace to the rest of Washington, the average income in Mountlake Terrace is $1,129 less.