Welcome to the Forum. If a Google search or the Yellow Pages turns up nothing, try looking for Community groups based on nationality.
If your community has
enough Portuguese, Croatian or Italian people for there to be a community group, you will almost certainly find people skilled in stone work amongst them.
I'm sure there are others. In Victoria British Columbia, Portuguese from the Azores represent a small percentage of the population, but a very large percentage of stonemasons. It will be different in each
City. In the eastern US, there are many of Italian extraction who do brick and stone work. For many of these people, it's not a fleeting fancy. They learned off their fathers and great-grandfathers, so you're likely to find people who really know what they are talking about.