Rio Nido's Post Office is a small unit on the side of its fire station. Its year-round population in 2000 was 296 persons and in 2010 it increased to 522 persons; typical of resort communities, the population increases in the summer. There were 179 housing units. The land area is only .1 square mile (.2 square kilometers). Rio Nido consists of numerous summer homes and cabins, as well as a few small businesses- a bar/restaurant, public pool and a small resort hotel. Most of the homes are located in a redwood canyon which contains a small creek that flows into the Russian River, Rio Nido Creek. The main roads are named Canyons One, Two, Three, Four, Six and Seven. There is no Canyon Five, because of an accident that happened on Canyon Six (that was going to be Canyon Five). The property comprising Rio Nido was purchased in 1908 as a single plot by the Eagle Lodge in San Francisco, and then it was broken up into parcels for Eagle Lodge members. The post office for Eaglenest, as the village was originally known, opened in 1908. The name was changed to "Rionido" in 1910. During
World War II a number of facilities were added to accommodate the huge crowds of sailors on liberty and soldiers and Marines in transit to the war in the Pacific. The Big Band era was in full swing and the Russian River area was a well-known recreation area. Many famous bands appeared in Rio Nido's dance hall. The "Rionido" post office was changed to "Rio Nido" in 1947. The
San Francisco Chronicle once reported the extended appearance in Rio Nido by singer-actress
Betty Hutton. Rio Nido is about north of the famed
Bohemian Grove. During the 1950s and the 1960s, a footbridge crossed the river to a public beach on the south shore. A small excursion boat regularly cruised between the Rio Nido beach and Johnson's Beach in Guerneville. A snack bar was maintained on the beach. Canoe rentals were available through Bob "W.C. Bob" Trowbridge, who also served as a Sonoma County sheriff's deputy and the head of the Sonoma County and State Democratic Central Committee for 38 years. Loudspeakers were set up around the square and on the beach, playing music from
KSRO in
Santa Rosa. A few cabins were available for rent. On summer evenings
Dick Crest (1930-2010), a teacher and band director at the
College of San Mateo, led a small orchestra in free concerts in the town square and at dances. By 1974, the beach had been abandoned and overgrown with weeds. The pedestrian tunnel (under the county highway) leading to the path down to the river has survived, but the path itself is virtually impassable, but some people have passed it. File:Russian River at Rio Nido, California (circa 1910s).jpg|Russian River at Rio Nido, c. 1910s File:California 2008 - Rob 071.jpg|Village Square, Rio Nido, May 2008 File:RioNido.jpg|Rio Nido beach, 1963. It has since been abandoned and the bridge dismantled. The path that led to the bridge is now virtually impassable. File:California 2008 - Rob 065.jpg|Rio Inn, 2008 File:California 2008 067.JPG|Trail to Russian River at Rio Nido, now overgrown with weeds and brush, 2008 ==Climate==