- 06April 6, 1873No events
- 07April 7, 1873No events
- 08April 8, 1873No events
- 09April 9, 1873No events
- 10April 10, 1873No events
- 11April 11, 1873No events
- 12April 12, 1873No events
A=ANNUAL
M=MONTHLY
Q=QUARTERLY
DISCLAIMER: THESE DUE DATES ARE SUBJECT TO CHANGE. WE WILL DO OUR BEST TO KEEP THIS CALENDAR UP TO DATE WITH THE EVERCHANGING DEADLINES. ANY STATE FILING DUE DATES ARE IN REFERENCE SPECIFICALLY TO THE WASHINGTON STATE DEPARTMENT OF REVENUE.