Hi Bill.
1. The Christmas Song (Chestnuts Roasting...etc)F
2. Silent Night C
3. Rudolph the Red Nosed Reindeer C
4. Away in a Manger F
5. White Christmas C
6. Jingle Bells F
7. Deck The Halls F
8. God Rest Ye Merry Gentlemen G
9. Good King Wenceslass G
10. Winter Wonderland E FLAT
11. Sleigh Ride G
12. Have Yourself a Merry Little Christmas C

I have checked the keys in several books that I have in my collection and the above appears to be the popular keys that they are played.

All the best for christmas
Peter B