What city is ZIP code 21792?

21792 is a Unionville, Maryland ZIP code.

What county is 21792 in?

ZIP code 21792 is in Frederick County, Maryland.

What time zone is ZIP code 21792 in?

21792 is in the Eastern Time zone (America/New_York).

What area code is 21792?

Phone numbers in ZIP code 21792 use area code 240.

Can I use 21792 for a street address?

No. 21792 is only for PO Boxes. Street addresses in Unionville use another ZIP code.

What ZIP codes are near 21792?

The nearest ZIP codes to 21792 are 21762 (Libertytown, 3.3 miles), 21776 (New Windsor, 5.2 miles), 21774 (New Market, 6.6 miles) and 21798 (Woodsboro, 7.1 miles).

ZIP code 21792

Where is ZIP code 21792?

Unionville, Maryland

Frederick County · PO Box only ZIP code

ZIP code 21792 belongs to Unionville, Maryland in Frederick County. 21792 is a PO Box only ZIP code: it is used for post office boxes at the Unionville post office, not for street addresses. It is in the Eastern Time zone and uses area code 240. The closest ZIP codes are 21762 (Libertytown, 3.3 mi west), 21776 (New Windsor, 5.2 mi northeast) and 21774 (New Market, 6.6 mi southwest).

ZIP code	21792
Type	PO Box only (no street delivery)
Status	Active
City	Unionville
State	Maryland (MD)
County	Frederick County
Time zone	Eastern Time · now
Area code	240
Coordinates	39.4748, -77.1855 map
3-digit prefix	217

The Census Bureau doesn’t publish population figures for po box only ZIP codes because nobody lives at a PO Box or a single organization’s address. For figures about the area, see the nearby standard ZIP codes below.

ZIP codes near 21792

ZIP code	City	Distance	Type
21762	Libertytown, MD	3.3 mi W	PO Box only
21776	New Windsor, MD	5.2 mi NE	Standard
21774	New Market, MD	6.6 mi SW	Standard
21798	Woodsboro, MD	7.1 mi NW	Standard
21771	Mount Airy, MD	7.1 mi S	Standard
21791	Union Bridge, MD	7.8 mi N	Standard
21757	Keymar, MD	8.1 mi NW	Standard
21701	Frederick, MD	8.2 mi W	Standard
21775	New Midway, MD	8.5 mi NW	PO Box only
21759	Ladiesburg, MD	8.6 mi NW	PO Box only
21793	Walkersville, MD	8.7 mi W	Standard
21770	Monrovia, MD	9.2 mi S	Standard

Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 21792 or measure the distance to another ZIP code.

How to address mail to 21792

JANE SMITH
PO BOX 123
UNIONVILLE MD 21792

Put the city, the two-letter state code and the ZIP code on the last line. Adding the 4-digit ZIP+4 code (21792-XXXX) helps mail sort faster but isn’t required.

Questions

What city is ZIP code 21792?: 21792 is a Unionville, Maryland ZIP code.
What county is 21792 in?: ZIP code 21792 is in Frederick County, Maryland.
What time zone is ZIP code 21792 in?: 21792 is in the Eastern Time zone (America/New_York).
What area code is 21792?: Phone numbers in ZIP code 21792 use area code 240.
Can I use 21792 for a street address?: No. 21792 is only for PO Boxes. Street addresses in Unionville use another ZIP code.
What ZIP codes are near 21792?: The nearest ZIP codes to 21792 are 21762 (Libertytown, 3.3 miles), 21776 (New Windsor, 5.2 miles), 21774 (New Market, 6.6 miles) and 21798 (Woodsboro, 7.1 miles).