Boundary data for Divisions (Level 1), Districts/Zilas (Level 2), Upazilas (Level 3), and Unions/Thanas (Level 4).

Standardized four-digit numeric codes used for delivery and logistics across 570 regions. Why These Updates Matter

Misrepresenting census or health data by using old district outlines.

For global consistency, GADM.org provides comprehensive spatial database files for Bangladesh.