Santa's Letters, Inc. Non-Profit Organizations Santa's Letters, Inc. Visit Website Request Info 32828 Reba Rd. Millville, DE 19937 (302) 500-2249 About Map About Santa's Letters, Inc. is a 501(c)(3) non-profit charitable organization dedicated to helping local Sussex County families have a memorable Christmas and holiday season. What's Nearby? Distance: 5 10 15 20 25 50 mi.