Can you guess which came first, the use of country-wide Zip Codes or SISK Mailing Service, Inc.? The answer is SISK, by 10 years!
While the use of country-wide Zip Codes was not introduced until 1963, it was 10 years earlier in 1953 that the late Roger F. Sisk founded the company that is now SISK Mailing Service, Inc. What started out as Mailing Services of Washington became Sisk Mailing Service, Inc. in 1969.