Clipboard researched by Kathie Bozanich, Dallas Jamison and Rick VanderKnyff / Los Angeles Times. Graphics by Doris Shields / Los Angeles Times

All income tax returns must be postmarked by midnight, Monday, April 17, in order that they not be considered delinquent by the Internal Revenue Service. Late filers will incur a penalty. The following post offices around the county will be working late April 17, collecting mail that is deposited, and all returns mailed by midnight will receive the needed postmark:

ANAHEIM MAIN POST OFFICE 701 N. Loara St. (714) 520-2600 COSTA MESA MAIN POST OFFICE 1590 Adams Ave. (714) 546-5330 LAGUNA NIGUEL BRANCH POST OFFICE 29911 Niguel Road (714) 495-1510 LAGUNA HILLS BRANCH POST OFFICE 24001 Calle de la Magdalena (714) 837-1530 NEWPORT BEACH MAIN POST OFFICE * 1133 Camelback St. (714) 640-8720 NORTH GRAND STATION (SANTA ANA) ** 2201 N. Grand Ave. (714) 543-7995 or 543-7996 ORANGE MAIN POST OFFICE * 1075 N. Tustin Ave. (714) 836-2547 or 836-2557 SANTA ANA GENERAL MAIL FACILITY * 3101 W. Sunflower Ave. (714) 662-6200 In addition, postal booths will be set up at the following shopping malls. As with the post offices, mail deposited before midnight willl receive April 17 postmark: HUNTINGTON CENTER PLAZA 7777 Edinger Ave. Huntington Beach LAGUNA HILLS MALL 24155 Laguna Hills Mall Road Laguna Hills MALL OF ORANGE 2298 N. Orange Mall Road Orange *Retail assistance--including certificates of mailing, stamps, certified mail, registered mail and express mail--will be available until 10 p.m. ** Retail assistance will be available until 8 p.m. Source: U.S. Postal Service

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