| Statistic | Belfast | Maine | National |
| Population | 6,968 | 1,392,903 | 336,919,644 |
| Population density (sq mi) | 205 | 45 | 91 |
| Median age | 59.0 | 44.0 | 37.7 |
| Male/Female ratio | 0.7:1 | 1.0:1 | 1.0:1 |
| Married (15yrs & older) | 63% | 57% | 55% |
| Families w/ Kids under 18 | 25% | 38% | 43% |
| Speak English | 97% | 94% | 79% |
| Speak Spanish | 0% | 1% | 13% |

Belfast 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 Belfast population is 6,968 and has a population density of 205 people per square mile, compared to the national average of 91. The median age of all residents is 59, 63% of people 15 years of age or older are married and 25% have kids under the age of 18. In Belfast, 18% of households have a median income that is below $25,000 and 17% of households report a median income above $150,000.
Recognizing the racial demographics and ethnicity breakdown of Belfast is pivotal for addressing systemic inequities, championing social justice and inclusion and fostering resilient communities. In Belfast, the racial breakdown comprises 92.9% White, 1.3% Black or African American, 0% Asian, 0.5% American Indian, and 0% Native Hawaiian, with 0.6% of the population identifying as Hispanic or Latino. 96.8% of households reported speaking English only, while 0% reported speaking Spanish only. Furthermore, 3.9% of residents were categorized as foreign-born.
Areas like Belfast, characterized by below-average population density, offer a quieter lifestyle, closer connection to nature, strong community ties, improved affordability and enhanced safety, appealing to individuals seeking a break from urban life. These regions often boast a more affordable cost of living, with housing prices typically more accessible and residents may benefit from lower taxes, living expenses and insurance rates. Low population density areas also tend to have lower crime rates compared to densely populated urban areas, contributing to a greater sense of security for residents and their families. The Belfast population density is 205 people per square mile, which ranks lower than 50% of cities nationwide, presenting ample opportunity to enjoy these advantages.
A city with fewer children like Belfast can offer several benefits, catering to a demographic where families with fewer or no children may find an ideal environment. The advantages could include a quiet environment, increased focus on adult-oriented amenities, reduced traffic and increased affordability. Perhaps the biggest benefit could be a greater availability of housing options that cater to adult residents or smaller households. This could include more condominiums, apartments, or single-family homes designed for couples or individuals without children, providing a wider range of choices for prospective homebuyers or renters. Areas with fewer kids could also be an indication that this area could be a suitable area for retirees or seniors. In Belfast, only 25% of people have kids under the age of 18, which is far less than the national average. Another 63% of residents over 15 years old are married. This bodes well for taking advantage of all the benefits of an area where less kids are present.
Urban Development: Urban planners can leverage demographics data in Belfast 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 Belfast demographics data into planning and implementing affordable housing initiatives can help mitigate displacement risks.
Understanding Populations: Analyzing and interpreting the Belfast demographic data provides us with valuable insights into the characteristics and composition of populations, encompassing age, gender, race, ethnicity, income, education and other socio-economic variables. This understanding is crucial for addressing the diverse needs, preferences and challenges encountered by various demographic groups within communities. Demographics play a crucial role in understanding populations, informing decision-making processes, and advancing equity, inclusion, and overall well-being for all individuals and communities. The Belfast population and demographic data serves as a foundation for addressing social, economic and environmental challenges, while also nurturing the well-being and resilience of societies.
Social Cohesion: Analyzing demographics is vital for nurturing social cohesion and fostering understanding among diverse communities. By embracing and respecting variations in Belfast 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.

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| Race | Belfast | Maine | National |
| White | 92.86% | 94.78% | 73.35% |
| Black | 1.33% | 1.23% | 12.63% |
| Asian | 0.00% | 1.10% | 5.22% |
| American Indian | 0.52% | 0.60% | 0.82% |
| Native Hawaiian | 0.00% | 0.02% | 0.18% |
| Mixed race | 3.00% | 2.04% | 3.06% |
| Other race | 2.30% | 0.24% | 4.75% |