[4] Méndez, wrote a book titled Tuve que contar mi historia[5] which was published in 2009 by Editorial Tiempo Nuevo.

[7] In 2012, Méndez endorsed the nomination of Mitt Romney for president of the United States in the 2012 Republican National Convention.

[9] Among his notable works as mayor is the Aguadilla Ice Skating Arena,[1] Ramey Base Bowling Alley, Aguadilla Electronic Library, Atlantic Garden Veterans Cemetery,[10] Paseo Real Marina,[11] Las Cascadas Hotel,[12] Aguadilla City Center,[13] Skate and Splash Park,[14] and Tres Palmas Park.

[15][16] In 2019, Aguadilla received the City Livability Award from the United States Conference of Mayors and honored the efforts spearheaded by Carlos Méndez Martínez.

[17] He married on January 1, 1977, with Heidi G. Méndez (née Mayer) at Seattle in King County, Washington.