[3] The county was named for James Fannin,[4] who commanded the group of Texans killed in the Goliad Massacre during the Texas Revolution.

As of 2015, the largest self-reported ancestry groups were 48.50% English, 16.10% Welsh, 11.00% German, and 7.25% Irish.

As per the Texas Education Code, Grayson College's service area includes parts of the county in the following ISDs: Bonham, Dodd City, Ector, Leonard, Sam Rayburn, Savoy, Trenton, Whitewright, and Wolfe City.

[19] Once a Democratic stronghold for decades (in large part as it was the home of longtime United States Speaker of the House Sam Rayburn), Fannin County has shifted heavily toward the Republican Party since the 1990s.

As a sign of this trend, Republican candidates for president have won an ever-increasing share of the vote in each of the seven presidential elections, starting in 1996.

Media related to Fannin County, Texas at Wikimedia Commons