ZIP codes

ZIP codes in Black Hawk County, Iowa

Black Hawk County has 17 ZIP codes. 8 lie entirely inside it and 9 are shared with neighboring counties, so part of their land and their people are elsewhere. About 131,759 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes: 17; 1 more just touches the border (under 1% of their land)
Entirely inside: 8; 99% or more of their land
Shared with other counties: 9; Most with Tama County (4)
Most populated ZIP: 50613; 43,867 people · Cedar Falls
Least populated ZIP: 50623; 153 people
Largest ZIP by land: 50613; 128 sq mi · Cedar Falls

Map of the ZIP codes in Black Hawk County

Entirely in the county (99% or more of its land)
Shared, mostly in this county
Shared, mostly in other counties
Neighboring counties

Open in the interactive tool

Each area is a ZIP code with its number where it fits. Hover over one to see its name.

All ZIP codes in Black Hawk County

17 ZIP codes in Black Hawk County, IA, by number
ZIP code	Main city	Population	Land in the county	Residents in the county
50612	—	369	27%	≈ 162
50613	Cedar Falls	43,867	81%	≈ 42,999
50623	—	153	100%	153
50626	Dunkerton	1,468	99.5%	≈ 1,448
50629	Fairbank	2,082	16%	≈ 257
50634	Gilbertville	761	100%	761
50643	Hudson	3,027	91%	≈ 2,758
50647	Janesville	1,978	38%	≈ 682
50648	Jesup	4,269	58%	≈ 1,744
50651	La Porte City	3,147	71%	≈ 2,848
50667	Raymond	899	100%	899
50669	Reinbeck	2,439	1.0%	≈ 31
50675	Traer	2,198	2.2%	≈ 92
50701	Waterloo	30,232	100%	30,232
50702	Waterloo	20,882	100%	20,882
50703	Waterloo	17,952	100%	17,952
50707	Evansdale	7,784	100%	7,784

They also touch the county with under 1% of their land, so they aren’t counted: 50670.

ZIP codes shared with other counties

These 9 ZIP codes have part of their land in another county. The first figure is the share of their land in Black Hawk County; then, where the rest lies.

50612: 27% here; 73% in Tama County.
50613 (Cedar Falls): 81% here; 15% in Grundy County and 3.8% in Butler County.
50629 (Fairbank): 16% here; 32% in Buchanan County, 29% in Bremer County, and 22% in Fayette County.
50643 (Hudson): 91% here; 9.4% in Grundy County.
50647 (Janesville): 38% here; 62% in Bremer County.
50648 (Jesup): 58% here; 42% in Buchanan County.
50651 (La Porte City): 71% here; 26% in Benton County and 2.8% in Tama County.
50669 (Reinbeck): 1.0% here; 69% in Grundy County and 30% in Tama County.
50675 (Traer): 2.2% here; 98% in Tama County.

Cities and prefixes

By main city (the city, town or CDP each ZIP shares the most land with), the ones with the most are Waterloo (3), Cedar Falls (1), Dunkerton (1), Evansdale (1), Fairbank (1), and Gilbertville (1); 13 places in all.

They start with 2 different three-digit prefixes, one per USPS sorting center: 506 and 507.

Neighboring counties

Each one with its ZIP codes. Those without a page of their own open in the tool.

Tools for this county

ZIP codes by county or city The same ZIP codes on an interactive map, with the list as CSV or to copy County map with cities Its cities, towns and CDPs with their population ZIP codes in a radius The ZIP codes within 10 miles of its center, or any distance you like

Sources

U.S. Census Bureau, 2020 ZCTA to County, ZCTA to Place and ZCTA to Census Tract Relationship Files (and the 2022 County Subdivision to ZCTA file for Connecticut). Public domain.
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B01003 (population of each ZIP code, census tract and Connecticut town). Public domain.
U.S. Census Bureau, Vintage 2025 Population Estimates (county population) and 2025 Gazetteer Files (land area and interior point of each ZIP code). Public domain.
U.S. Census Bureau, Cartographic Boundary Files: ZCTAs 2020 and counties 2025, 1:500,000; county adjacency file 2025. Public domain.

How we count. ZIP codes here are the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs), the areas it draws to match USPS ZIP codes; ZIPs with no area of their own (PO boxes, single buildings) aren’t included. A ZIP can cross county lines: “Land in the county” is the exact share of its land inside, from the Census relationship files. “Residents in the county” is the whole ZIP for those entirely inside; for shared ones it’s an estimate, spreading the people of each census tract over the land it shares with the ZIP. Population: ACS 2020–2024. Methodology.

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