the ridgelines defining their basin. It includes the south fork of Nicasio Creek extending from Moon Hill, along the ridge separating Nicasio from San Geronimo and Samuel P. Taylor State Park, and extending northwest towards the northern end of Platform Bridge Road; the east fork (Lucas Valley fork) of Nicasio Creek extending from Loma Alta and the ridge on the north side of Sir Francis Drake Boulevard, extending up through Big Rock and up towards Big-Rock Ridge; the Halleck Creek drainage, up to the ridges separating Nicasio from Novato; the northern drainages extending along the ridgelines of Rocky Ridge, Hicks Mountain and Black Mountain. A major landmark in the area is the man-made Nicasio Reservoir. Nicasio is surrounded by forested and open ridge lines surrounding a wide rolling valley. The area along Lucas Valley Road follows a narrow valley with mostly forested hillsides above it. Oak, bay, and fir trees are common in the area, and along some of the creeks stands of redwoods are still found. Wildlife is abundant; the Nicasio chickadee, a subspecies of the chestnut-backed chickadee, was named by Robert Ridgway. Three main roads cross the area: Lucas Valley Road, Nicasio Valley Road, and the Point Reyes-Petaluma Road. Important pieces of public land in the surrounding area include Point Reyes National Seashore, portions of the Golden Gate National Recreation Area, and Samuel P. Taylor State Park. Demographics The 2010 United States Census reported that Nicasio village had a population of 96. The population density was . The racial makeup of the CDP was 97.9% White and 2.1% African American. 7.3% of the population was Hispanic American or Latino of any race. There were 35 households, out of which 15 (42.9%) had children under the age of 18 living in them, 19 (54.3%) were opposite-sex married couples living together, 6 (17.1%) had a female householder with no husband present, 3 (8.6%) had a male householder with no wife present. There were 2 (5.7%) unmarried opposite-sex partnerships, and 0 (0%) same-sex married couples or partnerships. 6 households (17.1%) were made up of individuals, and 4 (11.4%) had someone living alone who was 65 years of age or older. The average household size was 2.74. There were 28 families (80.0% of all households); the average family size was 3.07. The population was spread out, with 28 people (29.2%) under the age of 18, 5 people (5.2%) aged 18 to 24,