- Hampton Park Post Office - Open 8 a.m. to 8 p.m.
- Suburban Plant Finance - Open 7:30 a.m. to 8 p.m.
- Baltimore Main Post Office - Open 8:30 a.m. to Midnight
- No Northern Virginia offices are extending their retail hours.
Some stations regularly close at 8 p.m. so click here to search by Zip Code for post office stations and hours near you. Remember your taxes need enough postage on them: 42 cents for 1 ounce and 17 cents for each additional ounce. Tax agencies will not pay for the extra postage and your return will be mailed back to you. Also, if you put your return in the curbside mailbox make sure it's there before the last pickup time so it will be postmarked on time.
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