About this application: This application provides summary profiles showing frequently requested data items from various US Census Bureau programs. Profiles are available for the nation, states, and counties.
Mean travel time to work (minutes), workers age 16 years+, 2014-2018 - (Minutes)
County
Value
Adair
23.1
Adams
20.7
Allamakee
22.5
Appanoose
20.2
Audubon
19.4
Benton
24.0
Black Hawk
16.1
Boone
21.8
Bremer
20.0
Buchanan
23.1
Buena Vista
14.1
Butler
23.6
Calhoun
20.3
Carroll
13.4
Cass
19.1
Cedar
24.9
Cerro Gordo
17.3
Cherokee
16.3
Chickasaw
19.5
Clarke
24.6
Clay
15.9
Clayton
22.1
Clinton
19.6
Crawford
16.6
Dallas
21.4
Davis
22.3
Decatur
24.2
Delaware
23.1
Des Moines
16.4
Dickinson
15.7
Dubuque
16.2
Emmet
17.7
Fayette
19.6
Floyd
19.9
Franklin
17.0
Fremont
23.7
Greene
18.7
Grundy
21.5
Guthrie
27.5
Hamilton
18.8
Hancock
18.8
Hardin
18.1
Harrison
26.8
Henry
17.8
Howard
18.5
Humboldt
18.8
Ida
18.8
Iowa
23.5
Jackson
23.3
Jasper
22.3
Jefferson
15.5
Johnson
19.0
Jones
24.9
Keokuk
24.4
Kossuth
14.5
Lee
17.9
Linn
18.6
Louisa
23.8
Lucas
21.2
Lyon
17.0
Madison
28.1
Mahaska
18.3
Marion
19.3
Marshall
17.1
Mills
24.2
Mitchell
19.2
Monona
21.0
Monroe
23.8
Montgomery
19.7
Muscatine
17.4
O'Brien
16.0
Osceola
18.5
Page
14.6
Palo Alto
14.8
Plymouth
18.2
Pocahontas
17.7
Polk
19.5
Pottawattamie
20.5
Poweshiek
17.8
Ringgold
22.4
Sac
18.2
Scott
19.0
Shelby
19.0
Sioux
13.1
Story
17.9
Tama
22.4
Taylor
20.7
Union
17.4
Van Buren
21.8
Wapello
18.0
Warren
24.0
Washington
21.3
Wayne
22.6
Webster
16.6
Winnebago
17.0
Winneshiek
17.1
Woodbury
18.0
Worth
21.4
Wright
15.7
Value for Iowa (Minutes): 19.1
Data item: Mean travel time to work (minutes), workers age 16 years+, 2014-2018
Sources: U.S. Census Bureau, American Community Survey (ACS) and Puerto Rico Community Survey (PRCS), 5-Year Estimates. The PRCS is part of the Census Bureau's ACS, customized for Puerto Rico. Both Surveys are updated every year.
Definition
Travel time to work refers to the total number of minutes that it usually took the person to get from home to work each day during the reference week. The elapsed time includes time spent waiting for public transportation, picking up passengers in carpools, and time spent in other activities related to getting to work.
Mean travel time to work is obtained by dividing the total number of minutes by the number of workers 16 years old and over who did not work at home. Mean travel time to work is rounded to the nearest tenth of a minute. For the complete definition, go to ACS subject definitions "Travel Time to Work."
Source and Accuracy
This Fact is based on data collected in the American Community Survey (ACS) and the Puerto Rico Community Survey (PRCS) conducted annually by the U.S. Census Bureau. A sample of over 3.5 million housing unit addresses is interviewed each year over a 12 month period. This Fact (estimate) is based on five years of ACS and PRCS sample data and describes the average value of person, household and housing unit characteristics over this period of collection.
Statistics from all surveys are subject to sampling and nonsampling error. Sampling error is the uncertainty between an estimate based on a sample and the corresponding value that would be obtained if the estimate were based on the entire population (as from a census). Measures of sampling error are provided in the form of margins of error for all estimates included with ACS and PRCS published products. The Census Bureau recommends that data users incorporate this information into their analyses, as sampling error in survey estimates could impact the conclusions drawn from the results. The data for each geographic area are presented together with margins of error at Using margins of error. A more detailed explanation of margins of error and a demonstration of how to use them is provided below.
For more information on sampling and estimation methodology, confidentiality, and sampling and nonsampling errors, please see the Multiyear Accuracy (US) and the Multiyear Accuracy (Puerto Rico) documents at "Documentation - Accuracy of the data."
Margin of Error
As mentioned above, ACS estimates are based on a sample and are subject to sampling error. The margin of error measures the degree of uncertainty caused by sampling error. The margin of error is used with an ACS estimate to construct a confidence interval about the estimate. The interval is formed by adding the margin of error to the estimate (the upper bound) and subtracting the margin of error from the estimate (the lower bound). It is expected with 90 percent confidence that the interval will contain the full population value of the estimate. The following example is for demonstrating purposes only. Suppose the ACS reported that the percentage of people in a state who were 25 years and older with a bachelor's degree was 21.3 percent and that the margin of error associated with this estimate was 0.7 percent. By adding and subtracting the margin of error from the estimate, we calculate the 90-percent confidence interval for this estimate:
Therefore, we can be 90 percent confident that the percent of the population 25 years and older having a bachelor's degree in a state falls somewhere between 20.6 percent and 22.0 percent.
