Online Markeing: Converted to WP, will get 404 code?

We have a website with a service area that covers many cities.. We have advertised each city on different places such as Yelp/Yahoo/Angie’s list..etc..

Some of these listings we do not have access to, and we still have our old website in them (ex. https://www.website.com/losangeles.html)

We want to convert to WP, but fear that when people will click on that old link, they will be taken to a HTTP 404 missing page.

Is it possible when someone clicks on ex. ‘https://www.website.com/losangeles.html‘ and be taken to the current page ex. ‘https://www.website.com/losangeles‘ ?

Thanks in advance!