McKinleyville first appeared as a
census designated place in the
1980 U.S. census. The census reported that 99.3% of the population lived in households, 0.7% lived in non-institutionalized group quarters, and no one was institutionalized. 92.2% of residents lived in urban areas, while 7.8% lived in rural areas. There were 6,726 households, out of which 28.6% had children under the age of 18 living in them. Of all households, 42.0% were married-couple households, 11.6% were
cohabiting couple households, 19.5% had a male householder with no spouse or partner present, and 26.9% had a female householder with no spouse or partner present. About 28.6% of all households were made up of individuals, and 11.8% had someone living alone who was 65 years of age or older. The average household size was 2.4. There were 4,081
families (60.7% of all households). The age distribution was 21.4% under the age of 18, 7.4% aged 18 to 24, 29.4% aged 25 to 44, 24.2% aged 45 to 64, and 17.6% who were 65years of age or older. The median age was 39.6years. For every 100 females, there were 95.3 males, and for every 100 females age 18 and over there were 92.8 males age 18 and over.
2010 census The
2010 United States census reported that McKinleyville had a population of 15,177. The population density was . The racial makeup of McKinleyville was 13,010 (85.7%)
White, 103 (0.7%)
African American, 700 (4.6%)
Native American, 211 (1.4%)
Asian, 17 (0.1%)
Pacific Islander, 338 (2.2%) from
other races, and 798 (5.3%) from two or more races.
Hispanic or
Latino of any race were 1,081 persons (7.1%). The Census reported that 15,098 people (99.5% of the population) lived in households, 79 (0.5%) lived in non-institutionalized group quarters, and 0 (0%) were institutionalized. There were 6,283 households, out of which 1,979 (31.5%) had children under the age of 18 living in them, 2,784 (44.3%) were
opposite-sex married couples living together, 691 (11.0%) had a female householder with no husband present, 386 (6.1%) had a male householder with no wife present. There were 619 (9.9%)
unmarried opposite-sex partnerships, and 58 (0.9%)
same-sex married couples or partnerships. 1,731 households (27.6%) were made up of individuals, and 515 (8.2%) had someone living alone who was 65 years of age or older. The average household size was 2.40. There were 3,861
families (61.5% of all households); the average family size was 2.94. The population was spread out, with 3,452 people (22.7%) under the age of 18, 1,349 people (8.9%) aged 18 to 24, 4,306 people (28.4%) aged 25 to 44, 4,189 people (27.6%) aged 45 to 64, and 1,881 people (12.4%) who were 65 years of age or older. The median age was 36.3 years. For every 100 females, there were 95.9 males. For every 100 females age 18 and over, there were 93.6 males. There were 6,565 housing units at an average density of , of which 6,283 were occupied, of which 3,770 (60.0%) were owner-occupied, and 2,513 (40.0%) were occupied by renters. The homeowner vacancy rate was 1.1%; the rental vacancy rate was 2.7%. 9,459 people (62.3% of the population) lived in owner-occupied housing units and 5,639 people (37.2%) lived in rental housing units. ==Governance==