| Statistic | Brookhaven | New York | National |
| Population | 3,306 | 20,171,207 | 336,919,644 |
| Population density (sq mi) | 570 | 428 | 91 |
| Median age | 46.9 | 38.2 | 37.7 |
| Male/Female ratio | 1.0:1 | 0.9:1 | 1.0:1 |
| Married (15yrs & older) | 65% | 52% | 55% |
| Families w/ Kids under 18 | 37% | 43% | 43% |
| Speak English | 88% | 70% | 79% |
| Speak Spanish | 9% | 15% | 13% |

The demographics of Brookhaven offer invaluable insights into the composition, dynamics and needs of both urban and rural areas, empowering planners, developers and policymakers to foster prosperity, equity, and well-being for all residents. With a population of 3,306, Brookhaven exhibits a population density of 570 people per square mile, contrasting with the national average of 91. The median age stands at 46.9, with 65% of individuals aged 15 or older being married and 37% having children under 18. In terms of income equality in Brookhaven, 18% of households report a median income below $25,000, while 37% report an income exceeding $150,000, showcasing a diverse economic landscape.
The Brookhaven 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 Brookhaven is 83.6% White, 7.1% Black or African American, 0.5% Asian, 0.4% American Indian and 0.2% Native Hawaiian - 14.4% of the population identify as Hispanic or Latino. Of all households, 88.1% reported speaking English only, while 8.7% reported speaking Spanish only. A total of 8.1% of residents were considered foreign born.
Regions characterized by lower-than-average population density, such as Brookhaven, offer a chance for a more relaxed lifestyle, deeper connection to nature, vibrant community bonds, enhanced affordability, and heightened safety, making them enticing options for those seeking refuge from the frenetic pace of urban life. These areas often boast a more budget-friendly cost of living, with housing prices typically more affordable and residents may benefit from reduced taxes, living expenses, and insurance rates. Low population density areas often exhibit lower crime rates than densely populated urban regions, fostering a greater sense of safety and security for residents and their families. The Brookhaven population density is 570 people per square mile, which ranks below 50% of cities nationwide, presenting ample opportunities to enjoy these exceptional benefits.
Policy Planning: At various levels of government and within organizations and businesses, demographic data and statistics serve as essential tools for guiding policy and decision-making processes. Through the examination and interpretation of Brookhaven demographic stats and data, policymakers, government officials, and organizational leaders can pinpoint areas requiring attention, allocate resources judiciously and design policies and initiatives tailored to the specific needs and preferences of distinct demographic segments. The utilization of Brookhaven demographic data plays a pivotal role in policy formulation by informing resource allocation, facilitating evidence-based decision-making, identifying key priorities, predicting future trends, assessing policy effectiveness, and advancing principles of equity and inclusivity. Through effective utilization of this data, policymakers can craft policies that are targeted, efficient, and responsive to the diverse needs of communities.
Urban Development: Urban planners can leverage demographics data in Brookhaven 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 Brookhaven demographics data into planning and implementing affordable housing initiatives can help mitigate displacement risks.
Social Cohesion: Reporting and analyzing demographics can play a crucial role in fostering social cohesion and understanding among diverse communities. By recognizing and appreciating differences in Brookhaven demographics, societies can promote inclusivity, diversity and social harmony, while addressing social disparities and promoting equal opportunities for all individuals. Racial demographics reflect the diversity of a population and contribute to fostering inclusive and welcoming communities. Embracing diversity strengthens social cohesion, promotes cultural understanding and enriches the fabric of society by celebrating the contributions of individuals from different racial and ethnic backgrounds.
| Race | Brookhaven | New York | National |
| White | 83.58% | 64.31% | 73.35% |
| Black | 7.06% | 15.60% | 12.63% |
| Asian | 0.50% | 8.12% | 5.22% |
| American Indian | 0.41% | 0.38% | 0.82% |
| Native Hawaiian | 0.16% | 0.04% | 0.18% |
| Mixed race | 6.15% | 2.93% | 3.06% |
| Other race | 2.15% | 8.62% | 4.75% |