Lake Forest: Lake Forest is a city in Orange County, California, United States. The population was 78,344 as of January 1, 2009. With 6,282 inhabitants per square mile (2,425 /km2), it is currently the most densely populated city in South Orange County.

Lake Forest incorporated as a city on December 20, 1991. Since being incorporated, it has expanded its limits to include the communities of Foothill Ranch and Portola Hills. Foothill Ranch and Portola Hills are master planned developments that brought new homes and commercial centers to the Eastern boundary of Lake Forest throughout the 1990s. Lake Forest (along with its neighboring cities Mission Viejo and Irvine) is ranked as one of the safest cities in the country. The private research firm Morgan Quitno ranked Lake Forest as the 15th safest city and another firm later ranked Lake Forest 10th in 2007 in the United States.

The city has two lakes from which the city gets its name. The lakes are man-made, and condominiums and custom homes ranging from large to small line their shores. The Lake Forest Beach and Tennis Club and Sun and Sail Club feature tennis courts, gyms, basketball courts, barbecue pits, volleyball courts, multiple swimming pools, saunas, hot tubs and club houses for social events. The "forest" for which the city is also named lies in the area between Ridge Route, Jeronimo, Lake Forest and Serrano roads, and consists mostly of Eucalyptus trees. It began in the 1900s when a local landowner, Dwight Whiting, planted 400 acres of Eucalyptus groves in the vicinity of Serrano Creek as part of a lumber operation. In the late 1960s, the Occidental Petroleum company developed a residential community in and around the Eucalyptus groves which had long since expanded and grown much denser.

The city is home to the headquarters of eyewear manufacturer Oakley, Inc.; in-flight entertainment provider Panasonic Avionics; hard-drive maker Western Digital; Karem Aircraft an aircraft company developing UAV's with major aircraft companies; telecommunications software developer Greenlight Wireless Corp.; barbecue retailer Barbeques Galore; medical equipment maker Apria Healthcare; and skateboarding companies Sole Technology, Inc., Etnies, and Tilly's; among others. It is also the home of the corporate headquarters for Eagle Community Credit Union, a credit union focused on serving postal and federal employees who live or work in Orange County.

However, along with Oakley, the city is probably best known as the home of Rick Warren's famed mega church, Saddleback Church, currently the eighth-largest church in the United States.