Alderpoint (formerly, Alder Point) is a census-designated place in Humboldt County, California at an elevation of 472 feet (144 m), 11 miles (18 km) east-northeast of Garberville. Its population is 137 as of the 2020 census, down from 186 from the 2010 census. The ZIP Code is 95511 and its area code is 707.

The town, named after the abundance of alder trees, began in 1910 as a center for construction of the Northwestern Pacific Railroad. The first post office at Alderpoint opened in 1911.

Historical population

Census	Pop.	Note	%±
2010	186		—
2020	137		−26.3%
U.S. Decennial Census 1850–1870 1880-1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

Race and Ethnicity

Racial and ethnic composition	2010	2020
White (non-Hispanic)	87.1%	62.77%
Hispanic or Latino (of any race)	5.38%	16.06%
Two or more races (non-Hispanic)	2.15%	9.49%
Native American (non-Hispanic)	4.84%	8.76%
Asian (non-Hispanic)	0.54%	1.46%
Pacific Islander (non-Hispanic)	0.0%	0.73%
Other (non-Hispanic)	0.0%	0.73%
Black or African American (non-Hispanic)	0.0%	0.0%

The 2010 United States Census reported that Alderpoint had a population of 186. The population density was 76.6 inhabitants per square mile (29.6/km). The racial makeup of Alderpoint was 170 (91.4%) White, 0 (0.0%) African American, 9 (4.8%) Native American, 1 (0.5%) Asian, 0 (0.0%) Pacific Islander, 1 (0.5%) from other races, and 5 (2.7%) from two or more races. Hispanic or Latino of any race were 10 persons (5.4%).

The Census reported that 186 people (100% of the population) lived in households, 0 (0%) lived in non-institutionalized group quarters, and 0 (0%) were institutionalized.

There were 80 households, out of which 19 (23.8%) had children under the age of 18 living in them, 29 (36.3%) were opposite-sex married couples living together, 10 (12.5%) had a female householder with no husband present, 9 (11.3%) had a male householder with no wife present. There were 9 (11.3%) unmarried opposite-sex partnerships, and 0 (0%) same-sex married couples or partnerships. 29 households (36.3%) were made up of individuals, and 3 (3.8%) had someone living alone who was 65 years of age or older. The average household size was 2.33. There were 48 families (60.0% of all households); the average family size was 2.83.

The population was spread out, with 32 people (17.2%) under the age of 18, 11 people (5.9%) aged 18 to 24, 43 people (23.1%) aged 25 to 44, 75 people (40.3%) aged 45 to 64, and 25 people (13.4%) who were 65 years of age or older. The median age was 47.0 years. For every 100 females, there were 111.4 males. For every 100 females age 18 and over, there were 126.5 males.

There were 93 housing units at an average density of 38.3 per square mile (14.8/km), of which 80 were occupied, of which 58 (72.5%) were owner-occupied, and 22 (27.5%) were occupied by renters. The homeowner vacancy rate was 0%; the rental vacancy rate was 0%. 144 people (77.4% of the population) lived in owner-occupied housing units and 42 people (22.6%) lived in rental housing units.

In the state legislature, Alderpoint is in the 2nd Senate District, represented by Democrat Mike McGuire, and the 2nd Assembly District, represented by Democrat Chris Rogers.

Federally, it is in California's 2nd congressional district, represented by Democrat Jared Huffman.

• Michael Bear Carson and Suzan Carson, serial killers
• Frank Cieciorka, graphic artist
• ED Denson, managed the prominent band Country Joe and The Fish that performed at Woodstock. In later years, he built a successful law practice that centered around representing the local marijuana growers in the area.

The Rancho Sequoia area of Alderpoint is called "Murder Mountain" from the actions of the Carson serial killers (Michael Bear Carson and Suzan Carson), including the murder of 26-year-old Clark Stephens on May 17, 1982, and for other disappearances, murders and rumored murders.

Two high-profile missing persons are Robert "Bobby" Tennison, a 38-year-old father of four, missing since January 2009, and Garret Rodriguez, a 29-year-old from San Diego, California, who was reported missing on April 25, 2013, by his father. In their last conversation in December 2012, Rodriguez told his father, Val Rodriguez, he was headed to "Murder Mountain" to work on a marijuana grow. After he went missing, his truck was found in June 2013. On November 28, 2013, human remains were found in a grave on a private property on Jewett Road, one day after a group of locals forced the admission from the suspect known to have committed the murder, about the exact location of a grave believed to be Rodriguez's. On December 17, the remains were identified as Rodriguez's, and he was confirmed a victim of a homicide. It is suspected that the anonymous tip came from a confession extracted from the man responsible for the murder, who gave up the information after being kidnapped, shot twice, and threatened by a group of eight local vigilantes on Thanksgiving Day. In 2018, Rodriguez and "Murder Mountain" were featured in the Netflix documentary series Murder Mountain.

Across the valley from Rancho Sequoia on Pratt Mountain, in 1973, 24-year-old Dirk Dickenson was shot in the back by Federal agent Lloyd Clifton during a military-style federal raid which arrived at his property by helicopter. Dickenson was found blameless by a Federal Department of Justice investigation; charges against his killer were moved to federal court and ultimately dismissed. Dickenson was posthumously featured on the cover of Rolling Stone and is recognized as the first victim of the U.S. war on drugs.

• California portal
• Sequoia County, California
• Murder Mountain (TV series)

• Eszterhas, Joe (May 24, 1973). "Death in the Wilderness: The Justice Department's Killer Narc Strike Force". Rolling Stone Magazine. No. 135.
• Robbins, William (August 16, 1985). "The Talk Of Alderpoint; In a Coast Mountain fastness, peace (and Police helicopters)". The New York Times. Retrieved June 28, 2013.