2020 census As of the
2020 census, Gustine had a population of 6,110 and a population density of . The median age was 35.3 years. 27.3% of residents were under the age of 18, 9.1% were aged 18 to 24, 24.3% were aged 25 to 44, 23.3% were aged 45 to 64, and 16.0% were 65 years of age or older. For every 100 females, there were 97.5 males, and for every 100 females age 18 and over, there were 94.7 males age 18 and over. 99.7% of residents lived in urban areas, while 0.3% lived in rural areas. The whole population lived in households. There were 2,035 households, of which 41.1% had children under the age of 18 living in them. Of all households, 51.1% were married-couple households, 6.5% were
cohabiting couple households, 17.8% were households with a male householder and no spouse or partner present, and 24.6% were households with a female householder and no spouse or partner present. About 20.3% of all households were made up of individuals, and 11.4% had someone living alone who was 65 years of age or older. The average household size was 3.0. There were 1,505
families (74.0% of all households). There were 2,146 housing units at an average density of . Of these, 2,035 (94.8%) were occupied and 5.2% were vacant. Of occupied housing units, 61.6% were owner-occupied and 38.4% were occupied by renters. The homeowner vacancy rate was 0.9%, and the rental vacancy rate was 4.4%.
Income and poverty The median household income in 2023 was $58,321, and the
per capita income was $25,725. About 2.2% of families and 4.1% of the population were below the poverty line.
2010 census At the
2010 census Gustine had a population of 5,520. The population density was . The racial makeup of Gustine was 3,875 (70.2%) White, 73 (1.3%) African American, 54 (1.0%) Native American, 95 (1.7%) Asian, 8 (0.1%) Pacific Islander, 1,191 (21.6%) from
other races, and 224 (4.1%) from two or more races. Hispanic or Latino of any race were 2,769 persons (50.2%). The whole population lived in households, no one lived in non-institutionalized group quarters and no one was institutionalized. There were 1,879 households, 757 (40.3%) had children under the age of 18 living in them, 1,025 (54.6%) were
opposite-sex married couples living together, 227 (12.1%) had a female householder with no husband present, 118 (6.3%) had a male householder with no wife present. There were 98 (5.2%)
unmarried opposite-sex partnerships, and 5 (0.3%)
same-sex married couples or partnerships. 437 households (23.3%) were one person and 234 (12.5%) had someone living alone who was 65 or older. The average household size was 2.94. There were 1,370 families (72.9% of households); the average family size was 3.50. The age distribution was 1,577 people (28.6%) under the age of 18, 481 people (8.7%) aged 18 to 24, 1,352 people (24.5%) aged 25 to 44, 1,319 people (23.9%) aged 45 to 64, and 791 people (14.3%) who were 65 or older. The median age was 35.3 years. For every 100 females, there were 98.3 males. For every 100 females age 18 and over, there were 96.4 males. There were 2,087 housing units at an average density of 1,345.6 per square mile, of the occupied units 1,197 (63.7%) were owner-occupied and 682 (36.3%) were rented. The homeowner vacancy rate was 3.4%; the rental vacancy rate was 12.2%. 3,348 people (60.7% of the population) lived in owner-occupied housing units and 2,172 people (39.3%) lived in rental housing units.
Portuguese community Gustine is home to a relatively high concentration of ethnic Portuguese-Americans. Most can trace their ancestry back to the
Azores, but the Portuguese-speaking community also welcomes many families from mainland
Portugal and
Brazil. This is shown by a large turnout in the yearly OLM (Our Lady of Miracles) Portuguese Festa when over 20,000 people from around Gustine and far away come to visit. ==Economy==