Lynnfield is a town located in the U.S. state of Massachusetts. It is within Essex County included in the Boston-Cambridge-Newton Metro Area. It has a total area of 10.5 square miles at 42°32′20″N 71°02′55″W. The elevation is 98 feet above sea level. As of the 2010 census data, it had a total population of 11,596. The population density was 1,100/sq mi. Estimated per capita income in 2016 was $55,249. Recent job growth is positively increased by 1.33 percent. The average travel time is 26 minutes. Lynnfield has Zip code 01940.