According to the May 2012 records from the Bureau of Labor Statistics, the mean annual mechanical engineer salary is $84,770. In other words, the 252,540 mechanical engineers in the United States earn a mean hourly wage of $40.75.The bottom ten percent in the occupation earn an annual salary of $52,030, while the top ten percent brings home a six-figure average salary of $121,530 each year.hose employed in Alaska enjoy the highest annual average of $103,840, and mechanical engineers in California make more than the national average at $93,420.