[3] It is named for John McMullen, founder of a colony in Texas.

[4] The McMullen County Courthouse was designed by the architect W.C. Stephenson, originally from Buffalo, New York.

Stephenson also designed some 50 buildings in Beeville, including the Bee County Courthouse.

30.70% of all households were made up of individuals, and 14.90% had someone living alone who was 65 years of age or older.

[13] McMullen County is heavily Republican, having only voted for a Democratic candidate once since 1952, when in 1964 Texas native Lyndon B. Johnson won in a national landslide against Republican Barry Goldwater.

Trump again broke this record in 2024, when he won nearly 92% of the vote in the county.