Areas north of the American River are served by the remaining school districts. This area was not originally part of the City of Sacramento and as such is not served by Sacramento City Unified School District. North Sacramento outside of Natomas and Robla (for K-8) is served by the Twin Rivers Unified School District. The Robla area is served by the Robla School District for K-8 and by Twin Rivers for 9–12. The Natomas region is served by the Natomas Unified School District. The Campus Commons area and the small portions of the Sierra Oaks neighborhood that fall into the city of Sacramento are served by the San Juan Unified School District.