About San Anselmo

San Anselmo is an incorporated town in Marin County, California, in the western United States. San Anselmo is located 1.5 miles (2.4 km) west of San Rafael, at an elevation of 46 feet (14 m). It is located about 20 miles (32 km) north of San Francisco. Neighboring towns include San Rafael to the east, Fairfax to the west, and Ross to the south. Mount Tamalpais dominates the view to the south. The population was 12,336 at the 2010 census.

The land in and around San Anselmo was mostly pastoral until 1874, when the North Pacific Coast Railroad (NPC) added to its line a spur track from San Anselmo to San Rafael. In 1875, the railroad completed a line from Sausalito to Tomales and north to Cazadero via San Anselmo. For a few years, the town was referred to on railroad maps as "Junction", but in 1883 the name San Anselmo came back into use. The San Anselmo post office opened in 1892. Two postal substations were operated: Lansdale, from 1924 to 1962, and Yolanda, from 1924 to 1954.

San Anselmo incorporated on April 9, 1907. Its name came from the Punta de Quintin land grant, which marked the valley as the Canada del Anselmo, or Valley of Anselm, Anselm being the name of a Native American who was buried in the area. San Anselmo was a silent film capital in the early 1900s. On March 12, 1974, San Anselmo officially became a town.

There are three main roads running through San Anselmo. Their junction is known locally as the Hub, which lies near the central business district. Sir Francis Drake Boulevard runs north from Ross, turns north-west at the Hub, and then proceeds west to Fairfax. Red Hill Avenue (also called "The Miracle Mile") runs west from San Rafael, after 4th Street and 3rd Street merge, and into the Hub where it becomes Center Boulevard. Center Boulevard runs north-west from the Hub to Fairfax and Sir Francis Drake parallels Center Boulevard to Fairfax, offset to the north.

A large part of southern and western San Anselmo is built on a natural flood plain. About every 15–23 years, heavy rains cause the San Anselmo creek to flood the center of town by up to 4 feet - 1925, 1940 (11.38" rainfall in 3 days), 1963, January 1982, as well as December 30/31, 2005. The worst flood, on Jan 2, 1982 (the highest creek water level, according to interviews with longtime creek side residents) was preceded by a rainfall amount that exceeded 8" in 12 hours.

San Anselmo's historic raised railroad bed (now Center Boulevard), acts as a dike, providing some flood protection to the west side houses, upstream of the business district.