| Statistic | Greenbrier | Tennessee | National |
| Population | 7,131 | 7,032,421 | 336,919,644 |
| Population density (sq mi) | 1,024 | 171 | 91 |
| Median age | 35.3 | 38.5 | 37.7 |
| Male/Female ratio | 0.9:1 | 1.0:1 | 1.0:1 |
| Married (15yrs & older) | 58% | 57% | 55% |
| Families w/ Kids under 18 | 45% | 41% | 43% |
| Speak English | 98% | 93% | 79% |
| Speak Spanish | 1% | 4% | 13% |

Greenbrier demographics provide invaluable insights into the composition, dynamics and needs of urban and rural areas, enabling them to plan, develop, and govern in ways that promote prosperity, equity and well-being for all residents. The Greenbrier population is 7,131 and has a population density of 1,024 people per square mile, compared to the national average of 91. The median age of all residents is 35.3, 58% of people 15 years of age or older are married and 45% have kids under the age of 18. In Greenbrier, 11% of households have a median income that is below $25,000 and 18% of households report a median income above $150,000.
The Greenbrier racial demographics and ethnicity breakdown serves as a critical tool for understanding and addressing systemic inequities, promoting social justice and inclusion and building stronger, more resilient communities. The racial breakdown in Greenbrier is 89.1% White, 3.5% Black or African American, 1.6% Asian, 0.3% American Indian and 0% Native Hawaiian - 4.2% of the population identify as Hispanic or Latino. Of all households, 97.9% reported speaking English only, while 1.1% reported speaking Spanish only. A total of 3.5% of residents were considered foreign born.
Areas like Greenbrier that have a higher than average population density tend to support environmental sustainability by reducing per capita energy consumption, greenhouse gas emissions and land use. Compact urban development encourages energy-efficient buildings, walking, cycling and the use of public transit, promoting sustainable lifestyles and reducing environmental impact. Densely populated areas also tend to have more vibrant social and cultural scenes, with a diverse population contributing to a wide array of cultural events, festivals and community activities. This diversity fosters creativity, innovation and cross-cultural exchange, enriching the social fabric of the community. The Greenbrier population density is higher than average and comes in at 1,024 people per square mile (compared to the nationwide average of 91), putting it in a position to take advantage of all the benefits of a densely populated area.
Education Allocation: Greenbrier demographic data can help guide education planning by identifying student demographics, school enrollment trends and educational needs, helping schools and policymakers allocate resources and develop effective educational programs. It can be an essential tool for identifying disparities in educational access and outcomes among different demographic groups, such as racial and ethnic minorities, socio-economic status, or students with disabilities. By disaggregating data by demographic factors, education planners can identify areas of inequity and develop targeted interventions to improve access, support and outcomes for marginalized students. Overall, Greenbrier demographic data is invaluable in education for promoting equity, supporting student success, and fostering inclusive learning environments that meet the needs of all students.
Policy Planning: Demographic data and statistics serve as vital tools for informing policy and decision-making processes across various levels of government, as well as within organizations and businesses. Through the reporting and analysis of demographic data, policymakers, government officials, and organizational leaders can pinpoint areas of need, allocate resources efficiently, and craft tailored policies and programs to address the unique needs and priorities of different demographic groups. The utilization of demographic data in Greenbrier is instrumental in policy planning, facilitating resource allocation, evidence-based decision-making, priority identification, trend forecasting, policy impact assessment, and the promotion of equity and inclusion. By harnessing this data effectively, policymakers can devise targeted, impactful, and inclusive policies that cater to the diverse needs of communities.
Social Cohesion: Analyzing demographics is vital for nurturing social cohesion and fostering understanding among diverse communities. By embracing and respecting variations in Greenbrier demographics, societies can advance inclusivity, diversity and social unity while combatting social inequalities and advocating for equal opportunities. Racial demographics mirror the diversity within a population and can be instrumental in cultivating inclusive and inviting communities. Embracing diversity strengthens social bonds, fosters cultural appreciation and enriches society by acknowledging the contributions of individuals from various racial and ethnic backgrounds.
| Race | Greenbrier | Tennessee | National |
| White | 89.05% | 77.84% | 73.35% |
| Black | 3.47% | 16.81% | 12.63% |
| Asian | 1.63% | 1.61% | 5.22% |
| American Indian | 0.31% | 0.29% | 0.82% |
| Native Hawaiian | 0.00% | 0.05% | 0.18% |
| Mixed race | 4.96% | 2.03% | 3.06% |
| Other race | 0.58% | 1.38% | 4.75% |