To find the correct fuse(s), you must consult your owner's manual. It will have a fuse box diagram that shows which fuses control the power locks. The manual should also tell you where the fuse boxes are located (there's usually one under the hood and one inside the vehicle, often under the dashboard).
If your owner's manual is unavailable, you can try searching online for a digital copy specific to your year and model of Town & Country. Searching "[Your Year] Chrysler Town & Country fuse diagram" should yield some results.
Important Note: Before working with fuses, always turn off the ignition. Incorrectly replacing a fuse can cause further damage.