In 2010, the population of Sea Ranch was 1,305. Its median age was 67.8 years. Its median household income was $78,125. Most residents were white (non-Hispanic). There were 124 Hispanics or Latinos living in the city, accounting for 9.0% of the total population.
The city is surrounded by water on three sides. Residents can walk to work or ride a bike. Sea Ranch's design manual for buildings suggests that they be integrated into the landscape. Some guidelines include lack of overhanging eaves and baffles on exterior lighting. This is to reduce nighttime light pollution. It also allows pets to congregate in the Sea Ranch Dog Park.
Sea Ranch's population was 1,305 at the 2010 census. Although it is not an incorporated city, it is census-designated. Its climate is Mediterranean, with a warm-summer climate. It is classified as a Csb by the Koppen Climate Classification system.