It's not about "Irish Population" but about Irish heritage persons who like traditional Irish music. You might look at the formats and ratings of stations in Ireland to see how small a segment that is... and that is in Ireland itself. Most Irish in the US today are well beyond first generation and are, like me, only prone to caring about the music on St Patrick's Day, if at all.
For any population, you have to look at how many first generation folks there are, as using of ethnic radio lessens in the second generation and is all but gone in the third.
As mentioned, the market has over 500,000 Hispanics, 11.4% of the population based on 2016 ACS (Census Bureau) data. In most comparable markets, about 50% of Hispanics will be Spanish dominant, with another significant percentage being bilingual. But, since the original population in the Boston area came from Puerto Rico in a migration that lasted through the 50's and 60's, most under-55 year old Hispanics descendant from those migrants are second and even third generation.
On the other hand, there are lots of national buys for Hispanic audiences but there are absolutely zero for Brazilians.
I may be wrong on this, but I believe most of the Portuguese-dominant population in eastern Massachusetts is Portuguese (mainly Cape Verdean) rather than Brazilian. WJFD in New Bedford, a full-power FM, has served this population very well for years. I assume its billing is nearly 100% local, but you'd think national brands like Budweiser and McDonald's might want to place Portuguese-language spots on WJFD to reach a sizable minority that isn't listening to English-language radio, wouldn't you?
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