Public holidays
1638, USA, Federal holidays
| # | Date | Public holiday |
|---|---|---|
| 1 | Friday, January 1, 1638 | New Year's Day |
| 2 | Monday, January 18, 1638 | Martin Luther King Day |
| 3 | Monday, February 15, 1638 | Washington's Birthday/Susan B. Anthony Day |
| 4 | Monday, May 31, 1638 | Memorial Day |
| 5 | Sunday, July 4, 1638 | Independence Day |
| Monday, July 5, 1638 | Independence Day (observance) | |
| 6 | Monday, September 6, 1638 | Labor Day |
| 7 | Monday, October 11, 1638 | Columbus Day |
| 8 | Thursday, November 11, 1638 | Veterans Day |
| 9 | Thursday, November 25, 1638 | Thanksgiving |
| Friday, December 24, 1638 | Christmas (observance)/Christmas Eve | |
| 10 | Saturday, December 25, 1638 | Christmas |
| Friday, December 31, 1638 | New Year's Day (observance) |