Least dense/Most rural mainly white CDs to vote for Hillary

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By People per square mile:

Nevada 4th (Kiheun - D)      14.2
New Mexico 3rd (Luján - D)      15.4
Oregon 4th (DeFazio - D)      45.2
California 2nd (Huffman - D)      55.6
Vermont At-large (Welch - D)   67.7
Arizona 2nd (McSally - R)      91.0
Washington 6th (Kilmer - D)      98.6
Washington 8th (Reichert - R)      99.2
New Hampshire 2nd (Kuster - D)      101.6
Colorado 2nd (Polis - D)      103.8

NV-4 is not actually rural, almost 90% lives in Clark County and the rest is very sparse. NM-3 is about the same white and Hispanic. All of these except VT-AL and NH-2 are in the West. HRC only broke 60% in CA-2.

[nclib]

only other one I can think of is maybe ME-1 or CT-2, but both of them have decent sized cities in them

I don't think either are that close.

So of all the congressional districts with a population density below that of the USA (83 per square mile), only 5 voted for Hillary Clinton.

No, I said mainly white. There are probably a couple other majority-minority ones like MS-2 and AL-7.