5. NEW YORK’S 10TH MANHATTAN, BROOKLYN. 57 percent have a college degree.

New York’s 10th runs alongside Manhattan’s West Side, from West 122nd Street all the way down to Battery Park. But oddly, it then jumps over to Brooklyn, hugs the coast for a while, then juts over to include much of south-central Brooklyn, including Borough Park, home to a large Orthodox Jewish community.

6. GEORGIA’S 6TH NORTHERN SUBURBS OF ATLANTA. 56 percent have a college degree.

Georgia’s Sixth doesn’t have much in common with the other districts near the top of this list. It isn’t a capital of some segment of the American elite, and there isn’t an obvious symbol of the district’s cultural, economic or political influence. Politically, the region has been reliably Republican for half a century.

It’s fair to wonder whether the district will stay so distinctive for much longer. Mr. Ossoff often says he wants to make his district the “Silicon Valley of the South,” and with such an educated work force, it’s not hard to see why. Emory University, Georgia Tech and Georgia State are all just a few miles south of the district.

Most obviously, an Ossoff victory would be a sign that the district’s politics were beginning to look more like those of well-educated suburbs elsewhere in the country.

7. WASHINGTON’S 7TH SEATTLE. 56 percent have a college degree.

Next up are the “latte liberals.” Washington hasn’t voted for a Republican governor, senator or presidential candidate since 1994 — tied for the longest streak in the country (with Delaware) — and Seattle is a big reason for that.

8. CALIFORNIA’S 12TH SAN FRANCISCO. 55 percent have a college degree.

And then the “San Francisco liberals,” led by Nancy Pelosi herself.

9. MASSACHUSETTS 5TH NORTHWESTERN BOSTON SUBURBS. 52 percent have a college degree.

The “Massachusetts liberals” are farther down the list than they would be if the district were drawn in a more compact way. If you start from the campus of Harvard, it splits, going toward Boston’s far western suburbs in one direction and back east to the coast in the other. It includes a mix of middle-class towns and wealthy enclaves along the way, but just about all of it voted for Mrs. Clinton in 2016.