I think I have compiled a list of all remaining exterior entry Hampton Inns. Feel free to let me know if there are any I'm missing, or ones that have changed and I am unaware of.

The ones I know of are:

Huntsville, AL
Brooksville, FL
Clearwater - Central, FL
Cocoa Beach, FL
Ft. Walton Beach, FL
Gainesville, FL (Has exterior and interior entry rooms)
Augusta - Washington Rd, GA
Columbus - Airport, GA
Dalton, GA
Dublin, GA
Hattiesburg, MS (Has exterior and interior entry rooms)
Fayetteville - I-95, NC
Lumberton - I-95, NC (Has exterior and interior entry rooms)
Walterboro, SC
Chattanooga - Airport, TN
Gatlinburg, TN
Houston - The Woodlands, TX
Tyler, TX

Exterior entrance Hampton Inns that have been bought by other companies since 2007 seem to have mostly turned into Quality Inn, Baymont Inn & Suites, Days Inn, Jameson Inn, Super 8, and a Howard Johnson Inn.