The county seat of Duval County, Texas, is San Diego.
For information on county government, contact the National Association of Counties Web site.
Additional information is available at these pages:
Other Texas Counties nearby: (San Diego) Duval County (Hebbronville) Jim Hogg County (Alice) Jim Wells County (Kingsville) Kleberg County (Corpus Christi) Nueces County (Sinton) San Patricio County