Some WordPress themes come with a 404 error page. They're a bit labor intensive to make from scratch (https://www.elegantthemes.com/blog/tips-tricks/creating-custom-wordpress-404-error-pages). But there are also some plugins that can help you out. Here's a link to some on WordPress.org...
You might want to set up a Google Alert for yourself. Let Google keep its digital eyes peeled for mentions. Then you can follow up and make sure the information is right.
Traffic from a local source like a city resource might be better served by providing them a specific landing page. You can...