Historically, Jenner was part of the Rancho Muniz. In 1867, John Rule bought of the rancho. When a writer named Charles Jenner moved to the area, Rule encouraged Jenner to build a house in what became known as Jenner Gulch, the site of the town. 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.
The 2010 United States Census reported that Jenner had a population of 136. The population density was 56.7 people per square mile. 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 households, out of which 6 had children under the age of 18 living in them, 26 were opposite-sex married couples living together, 6 had a female householder with no husband present, 2 had a male householder with no wife present. There were 6 unmarried opposite-sex partnerships, and 2 same-sex married couples or partnerships. 36 households were made up of individuals, and 9 had someone living alone who was 65 years of age or older. The average household size was 1.70. There were 34 families ; the average family size was 2.24. The population was spread out, with 7 people under the age of 18, 3 people aged 18 to 24, 15 people aged 25 to 44, 81 people aged 45 to 64, and 30 people who were 65 years of age or older. The median age was 58.5 years. For every 100 females, there were 106.1 males. For every 100 females age 18 and over, there were 115.0 males. There were 158 housing units at an average density of 65.9 per square mile, of which 66.3% were owner-occupied and 33.8% were occupied by renters. The homeowner vacancy rate was 1.9%; the rental vacancy rate was 35.7%. 67.6% of the population lived in owner-occupied housing units and 32.4% lived in rental housing units.
2000
As of Census 2000 figures for Jenner's zip code showed that of the primary languages spoken in Jenner 94% spoke English while 6% did not, of those, 2% spoke French, 2% spoke Spanish, 1% spoke German, 1% spoke Urdu, and less than 1% spoke a Native American language.
Climate
Jenner experiences a cool summer Mediterranean climate typical of coastal areas of California. The wet season typified by heavy rainfall is from October to May, and summers are often overcast, the sun blocked by marine layer clouds that keep it cool, humid, and often drizzly in the night and morning hours.
