Which ZIP code in St. Mary's County has the highest share of households with children?

20670 (Patuxent River), at 95.2%, among 11 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.

ZIP codes with the most families with kids in St. Mary's County, MD

These are the 11 ZIP codes in St. Mary's County with the highest share of households with children, out of 11 with at least 1,000 residents. 20670 (Patuxent River, 95.2%), 20622 (Charlotte Hall, 43.3%) and 20659 (Mechanicsville, 40.9%) lead the list. There is no single "best" ZIP code in St. Mary's County; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.

ZIP codes with the most families with kids in St. Mary's County

Rank	ZIP	Mailing city	Households with children under 18	Residents	Households	Residential mailboxes
1	20670	Patuxent River	95.2%	2,046	439	582
2	20622	Charlotte Hall	43.3%	5,185	1,489	1,585
3	20659	Mechanicsville	40.9%	24,324	8,300	8,521
4	20650	Leonardtown	39.1%	16,094	5,642	5,712
5	20690	Tall Timbers	39.1%	1,077	478	361
6	20636	Hollywood	36.9%	10,486	3,324	4,096
7	20619	California	36.0%	14,212	5,719	6,282
8	20634	Great Mills	33.8%	7,088	2,694	2,820
9	20653	Lexington Park	31.9%	26,852	11,028	10,223
10	20618	Bushwood	28.0%	1,705	656	315
11	20620	Callaway	13.6%	1,115	389	476

How we ranked them

Ranked by the share of households with one or more people under 18 (ACS Data Profile, 2020–2024). The Census Bureau does not publish a margin of error for this share in our files. ZIP codes need at least 1,000 residents to be ranked; 11 of 27 qualify.

Which of these to mail, and why

Households with children buy tutoring, youth sports, pediatric and family dental care, child care, birthday venues and family dining. EDDM reaches every door on a route, so a higher share means more of your pieces land with families.

The top five ZIP codes on this list hold 16,348 households, on 31 carrier routes with 16,761 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 20670 on the EDDM route map

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Frequently asked questions

Which ZIP code in St. Mary's County has the highest share of households with children?: 20670 (Patuxent River), at 95.2%, among 11 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by the share of households with one or more people under 18 (ACS Data Profile, 2020–2024). The Census Bureau does not publish a margin of error for this share in our files.
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.