| Statistic | Brentwood | California | National |
| Population | 65,405 | 40,994,941 | 336,919,644 |
| Population density (sq mi) | 4,402 | 263 | 91 |
| Median age | 40.9 | 36.0 | 37.7 |
| Male/Female ratio | 0.9:1 | 1.0:1 | 1.0:1 |
| Married (15yrs & older) | 63% | 52% | 55% |
| Families w/ Kids under 18 | 52% | 46% | 43% |
| Speak English | 75% | 56% | 79% |
| Speak Spanish | 13% | 29% | 13% |

Brentwood 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 Brentwood population is 65,405 and has a population density of 4,402 people per square mile, compared to the national average of 91. The median age of all residents is 40.9, 63% of people 15 years of age or older are married and 52% have kids under the age of 18. In Brentwood, 9% of households have a median income that is below $25,000 and 43% of households report a median income above $150,000.
The Brentwood 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 Brentwood is 60.6% White, 9.2% Black or African American, 10.5% Asian, 0.6% American Indian and 0.7% Native Hawaiian - 24.1% of the population identify as Hispanic or Latino. Of all households, 75% reported speaking English only, while 13.3% reported speaking Spanish only. A total of 14.2% of residents were considered foreign born.
In areas with high population density, residents enjoy a wealth of amenities and services conveniently located within walking distance or a short commute. Access to healthcare facilities, educational institutions, cultural venues, dining options, retail stores and public transit enhances residents' quality of life and overall well-being. Brentwood has a population density of 4,402 people per square mile, which far exceeds the national average of 91 and ranks among the most densely populated cities in the country.
A family-friendly city like Brentwood can place a strong emphasis on the well-being and requirements of families, establishing an atmosphere where children flourish, parents receive ample support and families collectively enjoy a superior quality of life. These cities are renowned for nurturing a tight-knit community, where neighbors actively support and watch out for each other. Additionally, they often feature outstanding educational opportunities, including top-tier schools, well-equipped libraries and diverse extracurricular activities. Access to quality education is indispensable for the holistic development and future achievements of children. By prioritizing the welfare of its inhabitants, such cities evolve into dynamic and resilient communities where families can genuinely thrive. In Brentwood, 52% of families have children under the age of 18, and 63% of residents aged over 15 are married. These demographic characteristics position this locality to fully reap the rewards of being a family-friendly area.
Policy Planning: Demographic data and statistics play a fundamental role in informing policy and decision-making processes across government entities, organizations and businesses. Through the analysis and interpretation of Brentwood demographic data, policymakers, government officials, and organizational leaders can pinpoint areas of concern, allocate resources efficiently, and devise policies and initiatives tailored to the specific needs and preferences of distinct demographic groups. The utilization of demographics in Brentwood can be crucial in policy planning, facilitating evidence-based decision-making, identifying key priorities, forecasting future trends, monitoring policy outcomes and advancing principles of equity and inclusion. By harnessing this data effectively, policymakers can develop policies that are targeted, effective and inclusive, thus meeting the diverse needs of communities.
Urban Development: Urban planners can leverage demographics data in Brentwood to design and develop areas that cater to residents' needs, spanning housing, transportation, and public services, while prioritizing sustainability and enhancing quality of life. Demographic changes can contribute to gentrification and neighborhood evolution, whether in urban or rural contexts. As neighborhoods attract new residents with diverse income levels and lifestyle preferences, property values may appreciate, potentially displacing longstanding residents and reshaping the neighborhood's identity. Understanding population density, age distribution, household size and income levels is essential for guiding decisions on zoning, transportation infrastructure, housing development and public amenities. Incorporating Brentwood demographics data into planning and implementing affordable housing initiatives can help mitigate displacement risks.
Healthcare Planning: The analysis of Brentwood demographics can offer insights into healthcare planning and delivery, identifying population health needs, disparities and risk factors. By understanding demographic trends, healthcare providers and policymakers can allocate resources effectively, develop prevention and intervention programs and address health inequities within communities. Through the use of demographic data and statistics, healthcare providers and policymakers aim to achieve equitable, accessible and high-quality healthcare for all individuals and communities. This proactive approach to healthcare planning ensures targeted interventions, efficient resource allocation and customized healthcare services to meet the diverse needs of populations.

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| Race | Brentwood | California | National |
| White | 60.64% | 61.26% | 73.35% |
| Black | 9.20% | 5.85% | 12.63% |
| Asian | 10.47% | 13.85% | 5.22% |
| American Indian | 0.65% | 0.74% | 0.82% |
| Native Hawaiian | 0.71% | 0.39% | 0.18% |
| Mixed race | 9.63% | 4.62% | 3.06% |
| Other race | 8.71% | 13.28% | 4.75% |