What is the transmission capacity of a 2003 Chrysler town and country with filter?

There's no single "transmission capacity" for a 2003 Chrysler Town & Country because it depends on which transmission it has (they used a few different ones that year) and whether you're talking about the amount of fluid needed for a drain and fill, a complete flush, or just topping it off.

To find the correct amount, you must consult your owner's manual. The manual will specify the transmission fluid type and the correct amount for your specific vehicle's transmission. You can also find this information online by searching for your specific vehicle's year, make, model, and transmission type (e.g., "2003 Chrysler Town & Country 3.3L transmission fluid capacity"). Using a filter in the process doesn't change the total capacity, just how much fluid is replaced during a service.