Go to this link
https://www.fcc.gov/files/text-911-master-psap-registryxlsx
Download the file. It has a record of all the cities in the united states that have text messaging services. You can search for your city in the search tab.
Each area has a designated phone number and email address
To send a delayed text message from your phone you can look up the instructions on the internet which might vary depending on your phone model.
To send a delayed email you might need an app called "boomerang mail". It only works for android phones. I use this app for my gmail account.