If you haven't filed your tax return, the clock is ticking. The deadline is Wednesday at midnight.
Thirty-five postal offices in the state will pick up mail through midnight. But you won't be able to purchase stamps or conduct other postal business.
Only the Denver General Mail Facility Center at 53rd and Quebec is open 24 hours and will offer customer service until the midnight deadline.
The IRS expects approximately 140 million Americans, including nearly 2.3 million Coloradans, to file tax returns this year with an estimated 36 to 40 percent using the mail.
Of those, 25 percent wait until the last week and another five to 10 percent wait until April 15.
Tax mail tips
Apply proper postage and stamps, especially with extra forms/schedules. It costs 42 cents for the first ounce; 17 cents for each additional ounce. One ounce is about four pages.
If you use a larger envelope, First Class postage is 83 cents for the first ounce, 17 cents for each additional ounce.
If you are not sure about the postage, it is best to add additional stamps or to take your tax mail forms to the Post Office to ensure the correct postage is applied.
If you use a non-IRS labeled envelope, make sure you print the proper IRS address.
Print your return address in the upper-left-hand corner of your tax mail envelope.
Customers who wish to certify that their tax mail form is received by the IRS should mail it using Certified Mail Service/Return Receipt -- available at your local Post Office.
While you are encouraged to mail your tax return before April 15, if you do wait to mail it late on tax day, be sure to drop off your tax return at a postal location that offers late tax mail pickup.
Customers with tax questions can contact the IRS at 1-800-829-1040 or by going to www.irs.gov
Metro-area postal facilities offering late pick-up:
Reminder: you can drop off your tax return and still have it post marked April 15 at these locations, but you can't purchase postage or any other USPS service. These offices are open until midnight, unless otherwise noted
Denver General Mail Facility: 7500 E. 53rd Place
Aurora Main Post Office: 16890 E. Alameda Parkway
Bear Valley Station: 7555 W. Amherst Ave.
Boulder Valmont Station: 2995 55th St.
Capitol Hill Station: 1541 Marion St.
Denver Downtown Station: 951 20th St.
Glendale Station: 945 S. Birch St.
Lakewood Station: 10799 W. Alameda Ave.
Mile High Station: 450 W. 14th St.
Montclair Station: 8275 E. 11th Ave.
Northglenn Station: 11887 Washington St.
North Pecos Station: 1411 Cortez St.
South Denver Station: 225 S. Broadway
Sullivan Station: 8700 E. Jefferson Way
University Park Station: 3800 Buchtel Blvd.
Greeley Main 930 39th Ave. -- until 10 p.m.
Littleton Highlands Ranch Post Office, 9609 S. Univ. Blvd.
Longmont Main Post Office, 201 Coffman St.
Longmont Twin Peaks Mail Processing Center, 1845 Skyway Dr.
Loveland Main Office, 446 E. 29th St.
Salida Post Office, 310 D Street
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