The original name San Juan was bestowed by a veteran of the Mexican–American War who settled there in 1853 because he thought the site looked like San Juan de Ulúa near Veracruz. When the post office opened in 1857 "North" was added to distinguish it from San Juan in San Benito County.[7]
Geography
According to the United States Census Bureau, the CDP covers an area of 2.4 square miles (6.3 km2), all of it land.
The Census reported that 269 people (100% of the population) lived in households, 0 (0%) lived in non-institutionalized group quarters, and 0 (0%) were institutionalized.
There were 130 households, out of which 25 (19.2%) had children under the age of 18 living in them, 38 (29.2%) were opposite-sex married couples living together, 17 (13.1%) had a female householder with no husband present, 7 (5.4%) had a male householder with no wife present. There were 13 (10.0%) unmarried opposite-sex partnerships, and 0 (0%) same-sex married couples or partnerships. 51 households (39.2%) were made up of individuals, and 13 (10.0%) had someone living alone who was 65 years of age or older. The average household size was 2.07. There were 62 families (47.7% of all households); the average family size was 2.71.
The population was spread out, with 43 people (16.0%) under the age of 18, 10 people (3.7%) aged 18 to 24, 67 people (24.9%) aged 25 to 44, 111 people (41.3%) aged 45 to 64, and 38 people (14.1%) who were 65 years of age or older. The median age was 49.8 years. For every 100 females, there were 124.2 males. For every 100 females age 18 and over, there were 115.2 males.
There were 146 housing units at an average density of 60.3 per square mile (23.3/km2), of which 62 (47.7%) were owner-occupied, and 68 (52.3%) were occupied by renters. The homeowner vacancy rate was 1.6%; the rental vacancy rate was 0%. 137 people (50.9% of the population) lived in owner-occupied housing units and 132 people (49.1%) lived in rental housing units.
^Durham, David L. (1998). California's Geographic Names: A Gazetteer of Historic and Modern Names of the State. Clovis, Calif.: Word Dancer Press. p. 531. ISBN1-884995-14-4.