Which ZIP code in Frederick County has the fastest population growth?

21770 (Monrovia), at 58.7%, among 26 ZIP codes with at least 1,000 residents.

Why are some ZIP codes missing?

ZIP codes with fewer than 1,000 residents are left out because their survey estimates swing too much to rank, and so are ZIP codes where the Census Bureau did not publish this figure.

Fastest-growing ZIP codes in Frederick County, MD

These are the 25 ZIP codes in Frederick County with the fastest population growth, out of 26 with at least 1,000 residents. 21770 (Monrovia, 58.7%), 21798 (Woodsboro, 42.3%) and 21716 (Brunswick, 41.8%) lead the list. There is no single "best" ZIP code in Frederick County; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.

Fastest-growing ZIP codes in Frederick County

Rank	ZIP	Mailing city	Population change	Residents	Households	Residential mailboxes
1	21770	Monrovia	58.7%	8,751	2,622	2,971
2	21798	Woodsboro	42.3%	2,928	929	914
3	21716	Brunswick	41.8%	7,200	2,924	3,371
4	20842	Dickerson	41.3%	2,369	802	753
5	21780	Sabillasville	33.8%	2,159	781	670
6	21777	Point Of Rocks	31.8%	2,462	817	624
7	21774	New Market	30.9%	17,134	5,647	6,693
8	21754	Ijamsville	22.3%	8,156	2,660	2,604
9	21702	Frederick	18.6%	49,605	18,525	19,996
10	21704	Frederick	18.5%	20,006	6,136	7,734
11	21701	Frederick	16.3%	43,048	18,651	20,269
12	21787	Taneytown	14.5%	11,645	4,431	4,630
13	21776	New Windsor	13.5%	6,261	2,346	2,091
14	21703	Frederick	12.0%	41,960	15,517	—
15	21783	Smithsburg	11.4%	9,910	3,632	3,304
16	21771	Mount Airy	10.5%	33,031	11,226	11,089
17	21773	Myersville	7.3%	5,826	1,997	1,935
18	21755	Jefferson	5.5%	5,909	2,136	2,284
19	21769	Middletown	2.9%	11,965	4,146	4,409
20	21793	Walkersville	2.9%	10,719	3,890	3,825
21	21791	Union Bridge	1.8%	5,340	1,968	1,829
22	21788	Thurmont	-2.1%	11,654	4,649	4,704
23	21710	Adamstown	-4.1%	4,661	1,672	1,717
24	21757	Keymar	-4.4%	2,671	1,018	1,097
25	21727	Emmitsburg	-10.9%	6,052	1,673	1,454

How we ranked them

Ranked by the change in ACS population estimates between the 2015–2019 and 2020–2024 releases. Both are 5-year averages, and ZIP code areas were redrawn for 2020, so a large change can partly reflect a boundary change. Both periods must have at least 1,000 residents. ZIP codes need at least 1,000 residents to be ranked; 26 of 33 qualify.

Which of these to mail, and why

Growing ZIP codes add households every year, which means new homes, new routes and customers without a go-to provider yet. Check the route map: new subdivisions can appear as new carrier routes.

The top five ZIP codes on this list hold 8,058 households, on 18 carrier routes with 8,679 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 21770 on the EDDM route map

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Businesses that mail these ZIP codes

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Frequently asked questions

Which ZIP code in Frederick County has the fastest population growth?: 21770 (Monrovia), at 58.7%, among 26 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by the change in ACS population estimates between the 2015–2019 and 2020–2024 releases. Both are 5-year averages, and ZIP code areas were redrawn for 2020, so a large change can partly reflect a boundary change. Both periods must have at least 1,000 residents.
Why are some ZIP codes missing?: ZIP codes with fewer than 1,000 residents are left out because their survey estimates swing too much to rank, and so are ZIP codes where the Census Bureau did not publish this figure.

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.