Seriously, I had always thought Chicago was supposed to have an enormous Irish population – yet you just don’t see it on this zip-code level census data. Even poking around and mousing over individual zip codes in the area, I didn’t see much to explain the lack — no concentrated, 100% Irish neighborhoods, say.
But, again, that’s why you do these sorts of projects. Surprise results are a good thing, as they help dispel illusions you previously labored under. The Irish are a wonderful group to study when discussing immigration, because they’re one of the more famous groups of immigrants to arrive in America and face opposition from those who were already here. The map is set so the darkest green (please forgive the stereotype I indulged in, using green to represent the Irish) represents zip codes with 25% or more Irish descent.
There are many more ancestral groups to cover, and I will keep putting together new maps for as long as I can find the time — keep watching jaredwkendall.com to see more of what makes up those who make up America.
Link to my Tableau tool, so you can get individual zip code data for all ancestral breakdowns: