The second oldest city in San Diego County, National City has almost 60,000 residents and is close to both Downtown San Diego and the Mexican border. The city is known for its wonderful parks, including the waterfront Pepper Park and the 30-acre Kimball Park. There is a strong military presence in the area because the three-mile port along San Diego Bay is part of Naval Base San Diego, the largest naval base on the West Coast. The median household income in National City is around $38,000.