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

20861 (Ashton), at 99.4%, among 37 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 Montgomery County, MD

These are the 25 ZIP codes in Montgomery County with the fastest population growth, out of 37 with at least 1,000 residents. 20861 (Ashton, 99.4%), 20871 (Clarksburg, 62.0%) and 20842 (Dickerson, 41.3%) lead the list. There is no single "best" ZIP code in Montgomery 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 Montgomery County

Rank	ZIP	Mailing city	Population change	Residents	Households	Residential mailboxes
1	20861	Ashton	99.4%	2,890	917	1,049
2	20871	Clarksburg	62.0%	30,182	9,347	10,397
3	20842	Dickerson	41.3%	2,369	802	753
4	20814	Bethesda	13.0%	32,795	14,904	18,961
5	20855	Derwood	13.0%	17,279	6,437	6,958
6	20816	Bethesda	11.2%	18,140	6,400	6,663
7	20872	Damascus	10.9%	13,983	4,659	4,948
8	20833	Brookeville	6.7%	7,860	2,568	2,686
9	20837	Poolesville	6.6%	6,699	2,366	2,359
10	20904	Silver Spring	6.1%	58,646	21,212	21,983
11	20878	Gaithersburg	4.9%	66,115	24,237	25,897
12	20852	Rockville	4.3%	48,180	21,743	25,118
13	20910	Silver Spring	3.7%	45,943	22,123	24,156
14	20874	Germantown	2.7%	62,738	22,662	24,506
15	20854	Potomac	2.7%	50,498	16,751	17,813
16	20902	Silver Spring	2.6%	54,261	18,236	18,457
17	20853	Rockville	2.5%	31,851	9,692	9,938
18	20905	Silver Spring	1.8%	19,004	5,899	5,788
19	20895	Kensington	0.8%	19,184	6,991	7,524
20	20817	Bethesda	0.4%	37,454	13,660	14,986
21	20901	Silver Spring	0.4%	36,435	13,114	13,058
22	20877	Gaithersburg	0.3%	38,546	12,519	13,642
23	20906	Silver Spring	-0.2%	70,595	25,958	27,180
24	20886	Montgomery Village	-0.3%	34,718	12,441	12,921
25	20815	Chevy Chase	-0.5%	30,505	12,937	14,980

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; 37 of 48 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 32,407 households, on 63 carrier routes with 38,118 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 20861 on the EDDM route map

More rankings

Businesses that mail these ZIP codes

Map it and price it

EDDM guides

Frequently asked questions

Which ZIP code in Montgomery County has the fastest population growth?: 20861 (Ashton), at 99.4%, among 37 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.