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Last-minute tax filers? You'll need to drive to Denver for that April 17 postmark

The United States Postal Service will once again accommodate the parade of people pursuing a postmark proving punctual posting of their tax returns – but only if you live in or near Denver.

All Northern Colorado post office retail windows will be open on April 17 with regular customer-service hours, but none will be open late. The only retail location staying open late April 17 will be the Denver GMF facility at 7500 E. 53rd place, which is open for business until midnight.

Community Message

The following Denver-area offices will postmark tax returns up to 12 midnight. There will be no retail services, but the collection boxes outside the office will be available for properly stamped envelopes:

Bear Valley Station, 7555 W. Amherst
Capitol Hill Station, 1571 Marion St.
Downtown Station, 951 20th St.
Glendale Station, 945 Birch St.
GMF Finance Station, 7500 E 53rd Place
Lakewood Station, 10799 W. Alameda Ave.
Mile High Station, 450 W. 14th St.
Montclair Station, 8725 E. 11th Ave.
North Pecos Station, 1411 Cortez St.
Northglenn Station, 11887 Washington St.
South Station, 225 S. Broadway
Sullivan Station, 8700 E. Jefferson Way
University Park Station, 3800 Buchtel Blvd.

Community Message
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March 20 2026 Edition