In case of an emergency, many parts of the USA support Text to 911. This technology allows you to contact 911 for help via text message (SMS).
The FCC reminds everyone that you should place a voice call to 911 whenever possible.
Much of the Shenandoah Valley((Warren County, VA has assured me they support this tech, even though they are not on the FCC list)) is covered, as shown on the FCC’s Public Safety list. Please feel free to verify other American cities and counties using that list. Or, reach out to your local police department or county offices to ask.
For more details, read up at the main FCC page for this technology.