Jenner, also known as Jenner-by-the-Sea, is a small coastal town and census-designated place (CDP) in Sonoma County, California, U.S. with a population of about 122 per the 2020 census. It is located on the Pacific coast near the mouth of the Russian River. State Route 1 runs through the town and State Route 116 runs nearby, along the Russian River. Immediately south of Jenner is Goat Rock Beach, a unit within the Sonoma Coast State Beach. History Historically, Jenner was part of the Rancho Muniz. The town’s namesake, Dr. Elijah K. Jenner, was a dentist and inventor from Vermont. When his son Charles K. was born in 1846, the family was living in Wisconsin. Elijah came west in 1850 and sought his fortune in the California goldfields. Working as a miner, he designed a pump that could raise water high. His patent application included a model pump made of pure gold, which is the only golden model that the Patent Office has ever received. Jenner’s family joined him in 1852. Traveling by ship from the Great Lakes to Panama, it crossed the Isthmus and sailed up the Pacific Coast. By 1854, the Jenners had settled near the mouth of the Russian River and built a house in what became known as Jenner Gulch, the site of the town. Charles K. Jenner would go on to be a prominent attorney in early Seattle, arguing several cases in front of the U.S. Supreme Court. Stillwater Cove Regional Park, located north of Jenner, features picnic facilities, beach access, and a historic one-room schoolhouse. Jenner received media attention in 2004 after the bodies of Lindsay Cutshall and Jason S. Allen were discovered on Fish Head Beach just north of town. The incident became known as the Jenner, California double-murder of 2004. Geography According to the United States Census Bureau, the CDP covers an area of 2.4 square miles (6.2 km2), 2.1 square miles (5.5 km2) of it land, and 0.3 square miles (0.7 km2) of it (12.00%) water. Demographics 2010 The 2010 United States Census reported that Jenner had a population of 136. The population density was . The racial makeup of the CDP was 91.9% White, 1.5% African American, 1.5% Asian, and 5.1% from two or more races. 5.9% of the population was Hispanic or Latino of any race. The Census reported that 100% of the population lived in households. There were 80