Southside Place is a city in west-central Harris County, Texas, United States. The population within the city was 1715 during the 2010 census. According to the census of 2000 Southside, Pl. was the 13th wealthiest location in Texas by per capita income. This city functions as a bedroom community for the upper middle and upper-class families. Many businesses are located in Southside Place all along the Bellaire Boulevard. The postal services of the United States use Houston for all addresses in Southside Place. Southside Place, TX, is not an acceptable city name for mail addressed to locations within the city.