(formerly, Montalvin) is a census-designated place[3] (CDP) in Contra Costa County, California.

[2] For census purposes, it formed part of Bayview-Montalvin, California until 2010, when it became a separate CDP with a population of 2,876.

The racial makeup of Montalvin Manor was 1,295 (45.0%) White, 222 (7.7%) African American, 36 (1.3%) Native American, 306 (10.6%) Asian, 27 (0.9%) Pacific Islander, 855 (29.7%) from other races, and 135 (4.7%) from two or more races.

There were 895 housing units at an average density of 2,622.3 per square mile (1,012.5/km2),of which 818 were occupied, 621 (75.9%) by the owners and 197 (24.1%) by renters.

It is in the West Contra Costa Unified School District.