| Statistic | Eureka | Illinois | National |
| Population | 5,485 | 12,671,821 | 328,239,523 |
| Population density (sq mi) | 2,043 | 228 | 91 |
| Median age | 37.9 | 37.4 | 37.7 |
| Male/Female ratio | 0.9:1 | 1.0:1 | 1.0:1 |
| Married (15yrs & older) | 62% | 55% | 55% |
| Families w/ Kids under 18 | 42% | 44% | 43% |
| Speak English | 97% | 77% | 79% |
| Speak Spanish | 3% | 13% | 13% |
Understanding the demographics of Eureka is essential for gaining insights into the composition, dynamics and needs of any city, town or village. This knowledge empowers planners, developers and policymakers to strategize effectively, promoting prosperity, equity and well-being for all residents. The Eureka population is 5,485, with a population density of 2,043 people per square mile, diverging from the national average of 91. The median age is 37.9, and 62% of individuals aged 15 or older are married, while 42% have children under 18. As far as income equality in Eureka, 19% of households have a median income below $25,000, whereas 11% report an income exceeding $150,000, indicating a varied economic landscape within the area.
The Eureka 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 Eureka is 92.8% White, 1.4% Black or African American, 0.1% Asian, 0% American Indian and 0% Native Hawaiian - 5.4% of the population identify as Hispanic or Latino. Of all households, 97% reported speaking English only, while 2.8% reported speaking Spanish only. A total of 1.8% 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. Eureka has a population density of 2,043 people per square mile, which far exceeds the national average of 91 and ranks among the most densely populated cities in the country.
Social Cohesion: The examination and interpretation of demographics are pivotal for nurturing social cohesion and promoting understanding among diverse communities. By acknowledging and honoring differences in Eureka demographics, societies can champion inclusivity, diversity and social cohesion while addressing social disparities and advocating for equitable opportunities. Racial demographics can potentially showcase the diversity of a population and are crucial for fostering inclusive and embracing communities. Embracing diversity fortifies social bonds, fosters cultural appreciation and enriches society by celebrating the contributions of individuals from diverse racial and ethnic backgrounds.
Urban Development: Eureka demographic statistics are invaluable for urban planners in designing and developing areas that cater to residents' needs, encompassing housing, transportation, and public services, all while fostering sustainability and enhancing quality of life. Shifts in demographics can influence gentrification and neighborhood transformation, whether in urban or rural settings. As neighborhoods attract new residents with varying income levels and lifestyle preferences, property values may increase, potentially displacing long-term residents and altering the neighborhood's character. Analyzing population density, age distribution, household size, and income levels is crucial for guiding decisions regarding zoning, transportation infrastructure, housing expansion and public amenities. Utilizing Eureka demographic data in planning and executing affordable housing initiatives can serve as a preventive measure against displacement.
Policy Planning: Demographic data and statistics can inform policy and decision-making processes at various levels of government, as well as in organizations and businesses. By reporting and analyzing Eureka demographics data, policymakers, government officials and organizational leaders can identify areas of need, allocate resources effectively and develop targeted policies and programs that address the specific needs and priorities of different demographic groups. Eureka demographics can play a crucial role in policy planning by informing resource allocation, evidence-based decision making, identifying priorities, forecasting future trends, monitoring policy impact and promoting equity and inclusion. By leveraging this data effectively, policymakers can develop policies that are targeted, effective and responsive to the needs of diverse communities.
| Race | Eureka | Illinois | National |
| White | 92.76% | 72.14% | 73.35% |
| Black | 1.44% | 14.30% | 12.63% |
| Asian | 0.15% | 5.10% | 5.22% |
| American Indian | 0.00% | 0.23% | 0.82% |
| Native Hawaiian | 0.00% | 0.03% | 0.18% |
| Mixed race | 2.92% | 2.34% | 3.06% |
| Other race | 2.73% | 5.86% | 4.75% |
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