According to the United States Census Bureau, the CDP covers an area of 6.0 square miles (15.6 km2), all of it land.

Overjoyed with the abundance of water, the dense growth of willows, cottonwoods and sycamores and the mustard and wild oats that grew on the hillsides, the settlers of San Bernardino named the stream "Lytle Creek" after their leader, Captain Andrew Lytle.

Lytle Creek Canyon has been a site for gold mining, farming and recreation activities such as fishing, camping, picnicking, and hiking.

All work is done by volunteers Under the Community Center Board of Trustees (a nonprofit organization), Ciji Mobley runs the Youth Group, Anna Sorum distributes commodities to about 100 individuals and runs a local branch of the San Bernardino County Library, Ken Philips delivers meals to the homebound, and Mary Stinson manages the local Red Cross emergency shelter program.

Sally Boyd directs an active branch of CERT (Community Emergency Response Team) also operates with county OES.

In addition, the US Forest Service has a station located in the Lytle Creek area.

There were 448 housing units at an average density of 74.4 per square mile (28.7/km2), of which 245 (73%) were owner-occupied, and 91 (27%) were occupied by renters.

According to the 2010 United States Census, Lytle Creek had a median household income of $77,568, with 2. of the population living below the federal poverty line.