Every year the U.S. Census Bureau releases mode split information obtained through the American Community Survey. We have produced two documents for downloading that provide the mode split data at the county and the metropolitan statistical area (MSA) levels.
The county-level document contains a series of tables, including estimates of total workers, and columns showing statistical significance by comparing 2013-2017 to 2008-2012. Over 2,800 counties are grouped by state and listed alphabetically. An asterisk (*) indicates that the 2013-2017 estimate is significantly different (at a 90% confidence level) than the American Community Survey (ACS) estimate from 2008-2012. Please note that the Census Bureau does not re-tabulate past-year estimates based on the current year’s (2017) county geographies; the comparison is with the existing geography of each data year. Download county-level report
We also have reformatted the comparative economic characteristics data for 2017 1-Year estimates to show the mode splits for over 300 MSAs. This document contains a series of tables, including estimates of total workers, and columns showing statistical significance. The tables compare 2017 to each of the previous four years. Metropolitan statistical areas (MSA) are listed alphabetically and pages are grouped by commute mode share. An asterisk (*) indicates that the estimate is significantly different (at a 90% confidence level) than the estimate from 2017. Download MSA-level report
Please note that the 5-year ACS estimates represent 60 months of collected data for all areas. The 5-year estimates are more reliable than 1-year estimates but less current. U.S. Census recommends using the 5-Year data when precision is more important than currency and for analyzing small populations.