There are a few ways you can check if your house is in the Canal Winchester Local School District, which is located in both Franklin and Fairfield counties.
You can take a look at the Canal Winchester Local School District Boundaries Map.
If your house is in Franklin County, go to the Franklin County Auditor's website. Put in your home's street number and name, then click "Search." Click on the right entry for your address, and then pick "Tax Distribution" from the toolbar on the left. The page will show which school district your address falls under.
If your house is in Fairfield County, head to the Fairfield County Auditor's website. Say "yes" to the disclaimer and then click on the "Address" tab. Put in your home address and click "Search." Click on the Parcel ID for the right address. Your address's school district will be listed under "Taxing District."
To double-check a certain address, give the Canal Winchester School District Main Office a call at (614) 837-4533.
If your house isn't in the Canal Winchester Local School District, click here for info on Open Enrollment.