There are are many ways to create Google Maps for integration in your library website. The newest edition to this list of map making tools is BatchGeo. Using this tool you can enter address info into an Excel Spreadsheet and paste it into BatchGeo and generate a Google Map. After you have created your map, BatchGeo will email you the code needed to embed the map into your site.
You can give it a whirl using the sample data that BatchGeo has on its homepage.