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

21155 (Upperco), at 30.8%, among 14 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 Carroll County, MD

These are the 14 ZIP codes in Carroll County with the fastest population growth, out of 14 with at least 1,000 residents. 21155 (Upperco, 30.8%), 21787 (Taneytown, 14.5%) and 21776 (New Windsor, 13.5%) lead the list. There is no single "best" ZIP code in Carroll 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 Carroll County

Rank	ZIP	Mailing city	Population change	Residents	Households	Residential mailboxes
1	21155	Upperco	30.8%	3,313	1,032	1,008
2	21787	Taneytown	14.5%	11,645	4,431	4,630
3	21776	New Windsor	13.5%	6,261	2,346	2,091
4	21771	Mount Airy	10.5%	33,031	11,226	11,089
5	21158	Westminster	5.6%	22,083	8,451	8,114
6	21784	Sykesville	5.1%	39,258	13,416	14,941
7	21104	Marriottsville	5.0%	6,052	2,097	2,277
8	21157	Westminster	3.3%	38,984	14,785	15,042
9	21102	Manchester	3.2%	12,162	4,413	4,295
10	21048	Finksburg	2.0%	10,481	3,723	4,112
11	21791	Union Bridge	1.8%	5,340	1,968	1,829
12	21074	Hampstead	-2.6%	14,777	5,889	6,081
13	21797	Woodbine	-2.6%	8,643	2,849	3,313
14	21757	Keymar	-4.4%	2,671	1,018	1,097

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; 14 of 14 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 27,486 households, on 53 carrier routes with 26,932 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 21155 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 Carroll County has the fastest population growth?: 21155 (Upperco), at 30.8%, among 14 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.