Which ZIP code in Boulder County has the highest share of households with children?

80516 (Erie), at 43.3%, among 15 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 Boulder County, CO

These are the 15 ZIP codes in Boulder County with the highest share of households with children, out of 15 with at least 1,000 residents. 80516 (Erie, 43.3%), 80027 (Louisville, 36.3%) and 80504 (Longmont, 30.8%) lead the list. There is no single "best" ZIP code in Boulder 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 Boulder County

Rank	ZIP	Mailing city	Households with children under 18	Residents	Households	Residential mailboxes
1	80516	Erie	43.3%	39,048	13,616	14,966
2	80027	Louisville	36.3%	34,127	13,180	14,806
3	80504	Longmont	30.8%	63,451	24,077	25,785
4	80026	Lafayette	30.3%	32,701	13,524	15,023
5	80020	Broomfield	27.7%	54,201	21,326	22,532
6	80540	Lyons	27.0%	4,642	2,025	1,402
7	80503	Longmont	25.5%	35,846	15,153	15,573
8	80304	Boulder	25.3%	25,383	11,358	12,139
9	80501	Longmont	25.0%	44,147	18,945	19,651
10	80305	Boulder	24.0%	16,291	6,976	7,285
11	80466	Nederland	21.6%	3,599	1,670	710
12	80301	Boulder	16.8%	25,007	12,371	13,814
13	80303	Boulder	13.2%	24,996	11,783	12,581
14	80302	Boulder	11.6%	29,569	12,425	12,329
15	80310	Boulder	0.0%	7,692	2	—

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; 15 of 21 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 85,723 households, on 142 carrier routes with 93,112 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 80516 on the EDDM route map

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Frequently asked questions

Which ZIP code in Boulder County has the highest share of households with children?: 80516 (Erie), at 43.3%, among 15 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.