Area code 951 serves western Riverside County in Southern California, including cities like Riverside, Corona, Moreno Valley, and Temecula. It was created in 2004 from a split of area code 909, which could no longer support the region’s rapid growth. The 951 area lies within the Inland Empire, a region known for its logistics, manufacturing, and suburban expansion. Riverside, the county seat, anchors the area with universities, historic landmarks, and a growing economy. With ten-digit dialing mandatory, the 951 code continues to serve a population that has surged due to Southern California’s housing and business development. Despite being relatively young, 951 is quickly becoming a recognizable regional marker. The area code reflects a mix of affordability, opportunity, and expansion beyond the Los Angeles metro core.