The April 17 tax deadline has arrived and a number of post offices in the Washington region will be open later to assist tax-payers will mailing last-minute returns.

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This year, the IRS postponed the deadline by two days because April 15 was a Sunday and the next day was Emancipation Day — a public holiday observed in the District.

Tuesday is also the deadline for Marylanders to file their state returns.

Here’s a list of post offices with extended hours in D.C., Maryland and Virginia:

WASHINGTON, D.C.

Open until 7 p.m.

•National Capitol Post Office, Massachusetts Avenue NE Washington, D.C. 20002-9997

•Friendship Post Office, 4005 Wisconsin Ave. NW, Washington, D.C. 20016-9997

MARYLAND

Open until 7 p.m.

•Suburban Window Service, 16501 Shady Grove Road Gaithersburg 20898-9996

•King Farm Shell, 700 Gaither Road Rockville 20850-5741

•CPU Opes Laundromat, 1024 Light St. STE 2, Baltimore 21230-4031

Open until 8 p.m.

•CPU Cradlerock, 6810 Cradlerock Way, Columbia 21045-4809

Open until 9 p.m.

•Baltimore, 900 E. Fayette St., Rm. 118, Baltimore 21233-9715

Open until 11 p.m.

•A-1 Services of Frederick, 467 West Patrick Street Ste. 1a Frederick 21701-4826

VIRGINIA

Open until 6 p.m.

•Alexandria Post Office, 1100 Wythe Street

•Fairfax Chantilly Post Office, 4410 Brookfield Corporate Drive

•Herndon Post Office, 590 Groove Street

•Sterling Potomac Falls Post Office, 46164 Westlake Drive

•Prince William Branch Post Office, 3360 Post Office Road

•Winchester Post Office, 340 N Pleasant Valley Road

Open until 8 p.m. ?

•Merrifield Post Office, 8409 Lee Highway