Postal delivery discrimination

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I recently moved to a rural area with a little more than 400 residents. There is no mail delivery available to my physical address and all mail must be picked up at the local post office. I opted to maintain a PO Box in a neighboring town, 4 miles away, because of the convenience of pickup. However, I am now finding that many companies will not deliver to a PO box or even accept an application for credit because I am unable to provide them with a physical mailing address. I know too that credit standards are lower for people who maintain a PO Box. I was basically turned down for credit through Home Depot because of this mailing problem although I make an above average income and my credit score is in the upper 700's. I consider this to be discriminatory and want to know what legal avenues I can pursue if any. Any help and/or advice would be greatly appreciated. Additional back ground information includes having had mail addressed to my physical address and having the local post office mark it as undeliverable and returning it to sender. What would be the ramifications of renting a post office box in my "home" town and leaving a message that any mail addressed to my physical address would be routed to my post office box? I am willing to be flexible but it doesn't appear that the postal system is willing to do the same. Thank you.