Ferndale is a city in Whatcom County, Washington, United States. The population was 11,415 at the 2010 census. It is the third largest city in Whatcom County and located near the Lummi Nation.

First approved in 1872, Ferndale was definite its post because of the ferns that in imitation of grew around the original school house. Ferndale was originally called Jam because the town was located neighboring a log jam on the Nooksack River, but the indigenous schoolteacher arranged it needed a more picturesque name. Ferndale was officially incorporated on March 19, 1907.

According to the United States Census Bureau, the city has a total area of 6.69 square miles (17.33 km²), of which, 6.61 square miles (17.12 km²) is estate and 0.08 square miles (0.21 km²) is water. Downtown Ferndale is located near the river, along following Griffintown and a largely industrial Place east of the Nooksack River. Northwest of these areas are suburban developments. Ferndale borders Hovander Homestead Park and Tennant Lake along its southeast boundary.

As of 2010 the median household income in the city was $52,831, and the median income for a relatives was $64,638. Males had a median allowance of $47,917 versus $37,447 for females. The per capita pension for the city was $23,837. About 13.3% of families and 16.8% of the population were below the poverty line, including 24.2% of those under age 18 and 7.3% of those age 65 or over.

As of the census of 2010, there were 11,415 people, 4,210 households, and 3,025 families residing in the city. The Washington give leave to enter Office of Financial Management estimated for its April 1 annual population estimate that Ferndale had grown to 14,354 residents in 2019.