During this time, the town had two inns, a granite rock quarry, a small carbonated beverage bottler, and various eating institutions.

The stagecoach line north from Boston to Portsmouth, New Hampshire, known locally as the "Newburyport Turnpike", ran through South Lynnfield.

Along with the communities of Chelsea, Lynn, Salem, Marblehead, Danvers, Middleton, Andover, Methuen, Haverhill, Amesbury and Salisbury, Lynnfield was a part of "The Gerry-mander" so described by the Boston Gazette on March 26, 1812.

Within Essex County, the town is bordered by Middleton to the north, Peabody to the northeast, Lynn to the southeast, and Saugus to the south.

Interstate 95 and Massachusetts State Route 128 pass concurrently through town twice, becoming separate just over the Peabody line.

MBTA Bus Route 436 clips the extreme southeastern corner of Lynnfield with a bus stop available at the intersection of Lynnfield Street and Lookout Terrace; the stop is located just two blocks southeast of Condon Circle (sometimes referred to as Goodwin Circle).

[5] Inbound service on MBTA Bus Route 436 travels to Central Square, Lynn to connect with the Newburyport/Rockport Commuter Rail Line; outbound buses provide service to the Northshore Mall in Peabody and the Liberty Tree Mall in Danvers.

In the 2008 Presidential election, John McCain received 55% of the town's vote,[19] up slightly from the George W. Bush's 53% in 2004.

[21] However, in a reflection of Donald Trump's weakness in wealthy Yankee suburban areas, the Republican presidential vote share in the town dropped to 51.5% in 2016.

[24] Lynnfield is part of Massachusetts's 6th congressional district, represented by Seth Moulton, effective January 2015.

In the Massachusetts Senate, Lynnfield lies within the Third Essex district and is currently represented by Democrat Brendan Crighton.

[25] The public school system consistently has one of the highest standardized test scores in the state.

In 2020, Lynnfield High School was ranked 11th overall and seventh in math and reading proficiency in Massachusetts by U.S. News & World Report.