San Diego is a city in Duval and Jim Wells counties, Texas, United States. It’s a county seat and it has a population of about 4500. The city is about 2 square miles in size and it’s all land. It has a median household income of about $22.000. The city was founded in 1800 by a father and son. It was occupied by gen. Taylor during the Mexican war. Casa Blanca is the post office and the oldest building in town still standing. It has been around since 1852
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