Wednesday is the first day for the 97703 ZIP code.

Because of population growth, the U.S. Postal Service has added the 97703 ZIP code to some addresses that have previously been part of 97701.

Postal customers whose ZIP code is changing should have received a written notification of the change.

The new ZIP code divides the 97701 code in half at U.S. Highway 97. West of U.S. Highway 97 will become 97703, while east of Highway 97 will remain 97701.

Customers in the affected area should use their new ZIP code and notify family, friends, clients and associates beginning Wednesday, as well as when reordering stationery and business cards. Most magazine publishers, financial institutions and insurance and utility companies use computerized mailing lists that update ZIP codes regularly.

Mail with either ZIP code will be delivered for one year after Wednesday’s change.