River Oaks, TX - Real Estate River Oaks is an affluent community located in the geographic center of Houston, within Harris County. River Oaks is considered to be one of the wealthiest communities in Texas and has one of the wealthiest zip codes in the United States. Bellaire Champion Forest / 1960 Clear Lake Cypress Cypresswood Friendswood Galleria Heights Katy Katy - Cinco Ranch Kingwood Memorial Meyerland Missouri City Montrose Northwest / SH290 Pearland Pearland - Shadow Creek Ranch Richmond / Rosenberg River Oaks Royal Oaks Country Club Sienna Plantation Spring - Gleannloch Farms Sugar Land Sugar Land - First Colony Sugar Land - Greatwood / River Park Sugar Land - New Territory / Telfair West Houston West University The Woodlands