La Crescenta-Montrose is a census-designated place (CDP) and an unincorporated area in Los Angeles County, California, encompassing those parts of the Crescenta Valley not in the cities of Glendale or La Canada Flintridge. However, both the unincorporated area and the portion of incorporated Glendale north of Montrose are collectively called La Crescenta. It is bordered on the north by the Angeles National Forest, on the east by La Canada Flintridge, on the south by Glendale, and the northwest by Tujunga. The Foothill Freeway runs through the southern portion of the area. The population was 19,653 at the 2010 census, up from 18,532 in the 2000 census.