Developed a PySpark-based Regional Population Analysis Script for the BigData2025-Rev/p3 repository, enabling computation of total population per region per decade from ORC-formatted census data. The solution established an end-to-end data pipeline, ingesting ORC files, aggregating regional totals, and exporting results to CSV for downstream analytics and reporting. Leveraging Python, PySpark, and SQL, the work focused on scalable data engineering practices and maintainable code structure. This feature laid the foundation for future dashboard integration and analytics-driven decision support, supporting regional trend analysis and planning. No major bugs were addressed during this period, with efforts concentrated on new feature delivery.