Lucas Valley-Marinwood is a census-designated place (CDP) in Marin County, California, United States.

[5] James Miller, of Irish descent, came overland to California in 1844 with the Stephens–Townsend–Murphy Party and in April 1845 arrived in San Rafael.

[6] In 1846 he purchased 680 acres (2.8 km2) of land from Timothy Murphy, grantee of Rancho San Pedro, Santa Margarita y Las Gallinas.

The building still stands but has been relocated in front of Miller Creek Middle school on Las Gallinas Avenue.

Silveira, the founding president of Marin Dairymen's Milk Co. Ltd. aka Marin-Dell, died in a ranch accident in 1937.

His highly recognizable and stylish homes can be found throughout Lucas Valley and Eastern Marinwood.

The Lucas Valley community center and pool were also constructed by Eichler as a centerpiece of the neighborhood.

In alphabetical order, they are Adobestone, Blackstone, Cobblestone, Deepstone, Emerystone, Flagstone, Heatherstone, Johnstone, Millstone, Opalstone, Peachstone, Rhinestone, Unionstone, and Windstone.

The second subdivision was smaller, built to the south of Miller Creek Road, featuring the same mix of ranch- and Cape Cod-style homes.

The streets are, in alphabetical order: Appleberry, Blackberry, Cedarberry, Danberry, Elderberry, Flaxberry, Greenberry, Huckleberry, Idylberry, Juniperberry, Kernberry, Loganberry, Mulberry, Newberry.

In 1977, George Lucas purchased 1,267 acres (5.13 km2) west of Marinwood, which he subsequently refashioned into Skywalker Ranch.

Geographically, Skywalker Ranch is located on the western side of the Big Rock Ridge and is not part of the Lucas Valley–Marinwood CDP.

According to the United States Census Bureau, the CDP has a total area of 5.7 square miles (15 km2), all of it land.

The U.S. Route 101 freeway forms the eastern limit of the CDP, and Lucas Valley Road is the southern border.

The CDP extends west up Lucas Valley road to the height of land at Big Rock.

There were 2,407 housing units at an average density of 420.3 per square mile (162.3/km2), of which 2,002 (85.3%) were owner-occupied, and 346 (14.7%) were occupied by renters.