All you need to do is request service and Comcast will send a tech out to do a site survey. They will then contact you and let you know if it's possible to get service at your address.
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I've asked a Comcast employee to help you. You should expect a reply in this thread.
Hello all, I can assist you with getting a tech out to your area to see if we can bring services to your home. For further assistance, please send me a private message with your full name, street address, and account number by clicking on my name (ComcastAmir) and then "private message me".