Data / Rankings / Crude birth rate, July to June / Counties in Iowa

Counties in Iowa by birth rate (July to June)

Davis County had the highest birth rate (July to June) of 99 counties in 2021, at 17.62 per 1,000 inhabitants. Calhoun County had the lowest, at 7.68 per 1,000 inhabitants. The median was 10.64 per 1,000 inhabitants and the figure for Iowa was 11.22 per 1,000 inhabitants. Source: the U.S. Census Bureau.

Highest17.62Davis County
Lowest7.68Calhoun County
Median10.6499 counties
Iowa11.22History

Top 40 counties, 2021

CSVChart (SVG)

Davis CountyDavis County: 17.62 per 1,000 inhabitants17.62Buena Vista CountyBuena Vista County: 14.86 per 1,000 inhabitants14.86Franklin CountyFranklin County: 14.65 per 1,000 inhabitants14.65Washington CountyWashington County: 13.85 per 1,000 inhabitants13.85Sioux CountySioux County: 13.58 per 1,000 inhabitants13.58Howard CountyHoward County: 13.58 per 1,000 inhabitants13.58Wayne CountyWayne County: 13.51 per 1,000 inhabitants13.51Allamakee CountyAllamakee County: 13.48 per 1,000 inhabitants13.48Palo Alto CountyPalo Alto County: 13.39 per 1,000 inhabitants13.39Lyon CountyLyon County: 13.36 per 1,000 inhabitants13.36Buchanan CountyBuchanan County: 13.26 per 1,000 inhabitants13.26Van Buren CountyVan Buren County: 13.26 per 1,000 inhabitants13.26Woodbury CountyWoodbury County: 13.09 per 1,000 inhabitants13.09Crawford CountyCrawford County: 13.08 per 1,000 inhabitants13.08Dallas CountyDallas County: 13.05 per 1,000 inhabitants13.05Polk CountyPolk County: 12.73 per 1,000 inhabitants12.73Wapello CountyWapello County: 12.68 per 1,000 inhabitants12.68O'Brien CountyO'Brien County: 12.55 per 1,000 inhabitants12.55Lucas CountyLucas County: 12.46 per 1,000 inhabitants12.46Clarke CountyClarke County: 12.32 per 1,000 inhabitants12.32Black Hawk CountyBlack Hawk County: 12.29 per 1,000 inhabitants12.29Mitchell CountyMitchell County: 12.01 per 1,000 inhabitants12.01Marshall CountyMarshall County: 11.87 per 1,000 inhabitants11.87Tama CountyTama County: 11.79 per 1,000 inhabitants11.79Monona CountyMonona County: 11.75 per 1,000 inhabitants11.75Adams CountyAdams County: 11.7 per 1,000 inhabitants11.7Wright CountyWright County: 11.66 per 1,000 inhabitants11.66Delaware CountyDelaware County: 11.48 per 1,000 inhabitants11.48Plymouth CountyPlymouth County: 11.43 per 1,000 inhabitants11.43Hancock CountyHancock County: 11.37 per 1,000 inhabitants11.37Humboldt CountyHumboldt County: 11.33 per 1,000 inhabitants11.33Clayton CountyClayton County: 11.33 per 1,000 inhabitants11.33Cherokee CountyCherokee County: 11.3 per 1,000 inhabitants11.3Kossuth CountyKossuth County: 11.26 per 1,000 inhabitants11.26Adair CountyAdair County: 11.18 per 1,000 inhabitants11.18Webster CountyWebster County: 11.08 per 1,000 inhabitants11.08Linn CountyLinn County: 11.01 per 1,000 inhabitants11.01Decatur CountyDecatur County: 10.95 per 1,000 inhabitants10.95Sac CountySac County: 10.94 per 1,000 inhabitants10.94Carroll CountyCarroll County: 10.9 per 1,000 inhabitants10.9
per 1,000 inhabitants. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2021
per 1,000 inhabitants
1Davis County Estimated17.62
2Buena Vista County Estimated14.86
3Franklin County Estimated14.65
4Washington County Estimated13.85
5Sioux County Estimated13.58
6Howard County Estimated13.58
7Wayne County Estimated13.51
8Allamakee County Estimated13.48
9Palo Alto County Estimated13.39
10Lyon County Estimated13.36
11Buchanan County Estimated13.26
12Van Buren County Estimated13.26
13Woodbury County Estimated13.09
14Crawford County Estimated13.08
15Dallas County Estimated13.05
16Polk County Estimated12.73
17Wapello County Estimated12.68
18O'Brien County Estimated12.55
19Lucas County Estimated12.46
20Clarke County Estimated12.32
21Black Hawk County Estimated12.29
22Mitchell County Estimated12.01
23Marshall County Estimated11.87
24Tama County Estimated11.79
25Monona County Estimated11.75
26Adams County Estimated11.7
27Wright County Estimated11.66
28Delaware County Estimated11.48
29Plymouth County Estimated11.43
30Hancock County Estimated11.37
31Humboldt County Estimated11.33
32Clayton County Estimated11.33
33Cherokee County Estimated11.3
34Kossuth County Estimated11.26
35Adair County Estimated11.18
36Webster County Estimated11.08
37Linn County Estimated11.01
38Decatur County Estimated10.95
39Sac County Estimated10.94
40Carroll County Estimated10.9
41Ida County Estimated10.87
42Mahaska County Estimated10.83
43Marion County Estimated10.8
44Warren County Estimated10.78
45Dubuque County Estimated10.78
46Taylor County Estimated10.74
47Clinton County Estimated10.74
48Floyd County Estimated10.69
49Osceola County Estimated10.66
50Scott County Estimated10.64
51Jackson County Estimated10.61
52Appanoose County Estimated10.59
53Johnson County Estimated10.58
54Ringgold County Estimated10.57
55Madison County Estimated10.53
56Muscatine County Estimated10.48
57Chickasaw County Estimated10.46
58Clay County Estimated10.43
59Benton County Estimated10.41
60Harrison County Estimated10.4
61Des Moines County Estimated10.36
62Lee County Estimated10.36
63Pottawattamie County Estimated10.27
64Jasper County Estimated10.25
65Hamilton County Estimated10.24
66Pocahontas County Estimated10.2
67Montgomery County Estimated10.17
68Worth County Estimated9.99
69Iowa County Estimated9.98
70Grundy County Estimated9.88
71Poweshiek County Estimated9.88
72Cass County Estimated9.85
73Union County Estimated9.84
74Boone County Estimated9.84
75Emmet County Estimated9.75
76Cerro Gordo County Estimated9.74
77Monroe County Estimated9.74
78Jefferson County Estimated9.66
79Dickinson County Estimated9.65
80Jones County Estimated9.59
81Greene County Estimated9.5
82Bremer County Estimated9.45
83Mills County Estimated9.41
84Fayette County Estimated9.39
85Winnebago County Estimated9.39
86Audubon County Estimated9.36
87Winneshiek County Estimated9.35
88Page County Estimated9.14
89Cedar County Estimated9.1
90Butler County Estimated9.06
91Keokuk County Estimated8.94
92Louisa County Estimated8.91
93Fremont County Estimated8.81
94Henry County Estimated8.76
95Shelby County Estimated8.01
96Hardin County Estimated7.99
97Guthrie County Estimated7.92
98Story County Estimated7.82
99Calhoun County Estimated7.68

Other periods

About this ranking

Estimated live births from July 1 of the previous year through June 30 of the reported year per 1,000 residents, using the average of the population estimates at the two July 1 endpoints.

Published Census population estimates rate. The year identifies the end of the July-to-June period. These estimates can be revised and differ from calendar-year birth rates.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. Population Estimates Program: birth rate, July 1 of the previous year to June 30 of the reported year, nation, states and counties. https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-08.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

Rank Counties in Iowa by birth rate (July to June) using official data, and cite the source.
rank_places {"indicator":"crude_birth_rate_july_june","level":"province","within":"Iowa","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=crude_birth_rate_july_june&level=province&within=Iowa&limit=10

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

Which county has the highest birth rate (July to June)?

Davis County, with 17.62 per 1,000 inhabitants in 2021, according to the U.S. Census Bureau.

Which county has the lowest birth rate (July to June)?

Calhoun County, with 7.68 per 1,000 inhabitants in 2021.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Population Estimates Program: birth rate, July 1 of the previous year to June 30 of the reported year, nation, states and counties. Retrieved 2026-10-08.

Crude birth rate, July to June: other rankings

Counties in Iowa: more rankings