Twenty-eight post offices across the state will offer late mail collection from specially marked boxes today, the filing deadline for federal tax returns.

The 28 post offices, listed below, will have collection boxes and/or lobby slots labeled with bright orange signs indicating "Tax Mail Drop — Final Pick-Up Midnight." Tax forms with correct postage deposited in those designated boxes and slots by midnight will receive April 15 postmarks.

All post offices will close at their regular times. The Hono­lulu Airport location will be the last to close at 8 p.m. and will be the best bet for last-minute customers who need to purchase stamps or special services.

These are the 28 locations offering late collections:

» Oahu: Airport, Downtown, Ewa Beach, Hale­iwa, Hawaii Kai, Kailua, Kaneohe, Kapalama, Laie, Makiki, Mililani, Pearl City, Waialae-Kahala, Wai­anae, Waikiki, Wai­pahu

» Maui: Kahului, Kihei, Lahaina, Maka­wao, Puka­lani, Wai­luku

» Hawaii island: Hilo, Kailua-Kona, Kamu­ela

» Kauai: Lihue

» Molokai: Kaunakakai

» Lanai: Lanai City

Collection boxes and post office lobby drops at all other locations will be collected only at their regular posted times today. Due to the declining numbers of citizens who submit hard-copy tax returns by mail, the U.S. Postal Service no longer provides curbside service to last-second filers of tax mail at its drive-by collection boxes.

More than 88 million individual federal income tax returns had been filed as of March 29, according to the IRS. Of that total, almost 90 percent were filed electronically. Last year more than 80 percent of the final total of 146 million federal tax returns submitted were filed electronically.