Historically, region-based markets have been limited to country-level scope. Starting in API version 2025-10, the Markets APIs will be updated to support province-level granularity for region-based markets. This enhancement lays the foundation for future market customizations at the state or province level. Currently, these markets are not customizable beyond the province level. Further updates and details will be provided in upcoming releases.
This is a companion discussion topic for the original entry at https://shopify.dev/changelog/province-scope-available-on-market-conditions