Not surprisingly, there was a high concentration there. My family settled in Montcalm and Mecosta counties specifically and lived in Lakeview and Millbrook. The name was also highly concentrated in New Zealand (a bit of a surprise, although I know a branch did go there) as well as it's native England.
If you've never heard of the site before, I recommend checking it out. I doubt it will break down any brick walls for you but it is a fun and interesting way to kill an hour. There are other types of searches available on the site too. Ethnic searches and regional searches (I looked up Lakeview, Michigan but Croad wasn't in the top surnames) are other options.