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is an affluent city in Los Angeles County, California, United States. The population was 20,318 at the 2000 census. Its ZIP code of 91011 ranks the city as the 85th most expensive city to live in the United States with a median home sale price of $1.25 million in 2008.
According to the United States Census Bureau, the city has a total area of 22.4 km² (8.6 mi²), all land.
The city is situated in the eastern end of the Crescenta Valley, sometimes referred to as the Crescenta-Cañada Valley. It is nestled between the San Gabriel Mountains and Angeles National Forest on the north, and the San Rafael Hills on the south. Most of the city drains southeastward toward Pasadena to Arroyo Seco, but the western part of the city (generally west of Alta Canyada Road) drains southward toward Glendale via Verdugo Canyon. Both drainages join the Los Angeles River north of downtown Los Angeles.
La Cañada Flintridge varies in elevation from about 970 feet (295 m) just below Devil's Gate Dam in the Arroyo Seco to about 2400 feet (730 m) at the highest neighborhood, along the mountain front east of Pickens Canyon, at the upper end of Ocean View Blvd. The city limits extend into the San Gabriel Mountains and reach 3440 feet (1050 m) along Mount Lukens Road, which follows the crest line well above the developed city.