2020 census

As of the 2020 census, Grayson had a population of 1,041 and a population density of 5,657.6 inhabitants per square mile (2,184.4/km²).^[23][24] The median age was 33.4 years. The age distribution was 310 people (29.8%) under the age of 18, 120 people (11.5%) aged 18 to 24, 269 people (25.8%) aged 25 to 44, 258 people (24.8%) aged 45 to 64, and 84 people (8.1%) who were 65 years of age or older.^[23] For every 100 females, there were 103.3 males, and for every 100 females age 18 and over there were 101.9 males age 18 and over.^[23]

The whole population lived in households. There were 267 households, of which 129 (48.3%) had children under the age of 18 living in them. Of all households, 164 (61.4%) were married-couple households, 16 (6.0%) were cohabiting couple households, 39 (14.6%) were households with a male householder and no spouse or partner present, and 48 (18.0%) were households with a female householder and no spouse or partner present. About 35 households (13.1%) were made up of individuals and 11 (4.1%) had someone living alone who was 65 years of age or older. The average household size was 3.9, and there were 224 families (83.9% of all households).^[23]

There were 284 housing units at an average density of 1,543.5 units per square mile (595.9 units/km²), of which 267 (94.0%) were occupied. Of occupied housing units, 161 (60.3%) were owner-occupied and 106 (39.7%) were occupied by renters. There were 17 vacant housing units (6.0%); the homeowner vacancy rate was 1.8% and the rental vacancy rate was 5.2%.^[23] 0.0% of residents lived in urban areas, while 100.0% lived in rural areas.^[25]

2010 census

The 2010 United States census^[26] reported that Grayson had a population of 952. The population density was 373.5 inhabitants per square mile (144.2/km²). The racial makeup of Grayson was 455 (47.8%) White, 17 (1.8%) African American, 4 (0.4%) Native American, 3 (0.3%) Asian, 0 (0.0%) Pacific Islander, 417 (43.8%) from other races, and 56 (5.9%) from two or more races. Hispanic or Latino of any race were 819 persons (86.0%).

The Census reported that 952 people (100% of the population) lived in households, 0 (0%) lived in non-institutionalized group quarters, and 0 (0%) were institutionalized.

There were 250 households, out of which 143 (57.2%) had children under the age of 18 living in them, 154 (61.6%) were opposite-sex married couples living together, 38 (15.2%) had a female householder with no husband present, 25 (10.0%) had a male householder with no wife present. There were 18 (7.2%) unmarried opposite-sex partnerships, and 0 (0%) same-sex married couples or partnerships. 22 households (8.8%) were made up of individuals, and 6 (2.4%) had someone living alone who was 65 years of age or older. The average household size was 3.81. There were 217 families (86.8% of all households); the average family size was 4.03.

The population was spread out, with 318 people (33.4%) under the age of 18, 104 people (10.9%) aged 18 to 24, 260 people (27.3%) aged 25 to 44, 204 people (21.4%) aged 45 to 64, and 66 people (6.9%) who were 65 years of age or older. The median age was 29.0 years. For every 100 females, there were 114.4 males. For every 100 females age 18 and over, there were 108.6 males.

There were 280 housing units at an average density of 109.9 per square mile (42.4/km²), of which 161 (64.4%) were owner-occupied, and 89 (35.6%) were occupied by renters. The homeowner vacancy rate was 4.7%; the rental vacancy rate was 11.9%. 578 people (60.7% of the population) lived in owner-occupied housing units and 374 people (39.3%) lived in rental housing units.