A second and unrelated source is consistent with the state-level Mass attendance estimates made in "Midwest Mass Attenders Outpace Rest of the Nation."
As it was noted in "Searching for Mass Online" one can use Google Trends to view how frequently Google users are searching for particular terms. This post had noted the trends in searches for "Mass times" closely mirror what one would expect from the Church calendar.
Google Trends can also zero in on where searches are coming from. See the screen shot below:
Searches for "Mass times" are more likely to come from people in Kansas and Nebraska than people in any other U.S. state. At the city-level Omaha and Kansas City, KS rank first and second. The top ten states are all ranked above average in CARA's estimates of Mass attendance.