People often ask for examples of CSV import files. Here are some examples you can use as a model for your own imports. You will need the Power add-on to import locations.
Example of what your Excel or Google Sheets with CORRECT SL_FIELD NAMES in the header rows would look like:
and what it looks like after downloading as CSV file format:
Files using the full Store Locator Plus header for all of the base plugin columns.
wp_locations.csv has a half-dozen WordPress related businesses around the US and Europe.