| Statistic | Duncan | Oklahoma | National |
| Population | 23,311 | 4,054,437 | 336,919,644 |
| Population density (sq mi) | 544 | 59 | 91 |
| Median age | 38.7 | 36.2 | 37.7 |
| Male/Female ratio | 0.9:1 | 1.0:1 | 1.0:1 |
| Married (15yrs & older) | 60% | 58% | 55% |
| Families w/ Kids under 18 | 40% | 44% | 43% |
| Speak English | 91% | 90% | 79% |
| Speak Spanish | 7% | 7% | 13% |

Understanding the demographics of Duncan 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 Duncan population is 23,311, with a population density of 544 people per square mile, diverging from the national average of 91. The median age is 38.7, and 60% of individuals aged 15 or older are married, while 40% have children under 18. As far as income equality in Duncan, 25% 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.
Recognizing the racial demographics and ethnicity breakdown of Duncan is pivotal for addressing systemic inequities, championing social justice and inclusion and fostering resilient communities. In Duncan, the racial breakdown comprises 78.9% White, 3.3% Black or African American, 0.8% Asian, 4.9% American Indian, and 0.2% Native Hawaiian, with 11.3% of the population identifying as Hispanic or Latino. 91.4% of households reported speaking English only, while 6.7% reported speaking Spanish only. Furthermore, 3.8% of residents were categorized as foreign-born.
Towns, villages or even small cities with below-average population density, like Duncan, offer the expectation of a more laid-back lifestyle, deeper immersion in nature, strong community bonds, improved affordability and enhanced safety, drawing individuals seeking respite from the hustle and bustle of urban living. These regions often feature a more affordable cost of living, with housing prices typically more reasonable and residents may enjoy reduced taxes, living expenses and insurance rates. Low population density areas generally boast lower crime rates than densely populated urban areas, fostering a greater sense of safety and security for residents and their families. Duncan has a population density of 544 people per square mile, which falls below 50% of cities nationwide, positioning it to leverage these outstanding benefits.
Education Allocation: Duncan 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, Duncan 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 play a fundamental role in informing policy and decision-making processes across government entities, organizations and businesses. Through the analysis and interpretation of Duncan 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 Duncan 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.
Social Cohesion: The reporting and analysis of demographics are essential for fostering social cohesion and understanding among diverse communities. By acknowledging and valuing differences in Duncan demographics, societies can champion inclusivity, diversity and social harmony while tackling social disparities and advocating for equal opportunities. Racial demographics showcase the varied makeup of a population and play a vital role in nurturing inclusive and hospitable communities. Embracing diversity bolsters social cohesion, enhances cultural comprehension and enriches society by honoring the contributions of individuals from diverse racial and ethnic backgrounds.
| Race | Duncan | Oklahoma | National |
| White | 78.90% | 72.85% | 73.35% |
| Black | 3.26% | 7.26% | 12.63% |
| Asian | 0.79% | 2.00% | 5.22% |
| American Indian | 4.88% | 7.39% | 0.82% |
| Native Hawaiian | 0.21% | 0.13% | 0.18% |
| Mixed race | 6.03% | 7.73% | 3.06% |
| Other race | 5.93% | 2.64% | 4.75% |