Out of our Best Dallas Suburbs list, Highland Park ranks the highest for being the most expensive neighborhood. Here, the median home value is $1,508,900 with a median sale price of $2.5 million. In fact, Highland Park is the most affluent city in all of Texas. According to the U.S census, it ranks nationally at #7 as the most affluent city in the United States. Similarly, Highland Park, TX residents have a median household income of around $211,136.