Construction began on the new Algona Post Office on May 28, 1964 with an expected completion date of October 31, 1964. The construction project was postponed three times due to heavy rains in the spring and summer, heavy snow in the winter, and heavy thawing and flooding the following spring. Once work was completed, the process of moving equipment and mail from the old post office to the new one began 4:00 a.m. on Sunday, May 2, 1965. The Post Office opened to the public the following day and was formally dedicated September 11, 1965.