I'd be happy to geocode the addresses you need. If need be, my bid also includes updating the original U.S. map in a raster or vector format or even creating a new one, if you'd like. I have 19 years of experience in cartography and I encourage you to take a look at my profile portfolio. Plotting locations and mapping them is something I do regularly. I expect to be able to do this job in a matter of hours, so I can offer a very quick turnaround time.
Under skills required, you've listed Javascript and PHP. I have no experience in Javascript and only basic knowledge of PHP, but based on your project description, I don't think either will be necessary for this task.
I'm looking forward to hearing from you. If you have any questions, don't hesitate to contact me.
Regards,
Michael Borop