To put it plainly, the highest populated states have the lowest vote per capita, the lowest populated states have the highest vote per capita.
LARGEST STATES
California - 40 million residents, 55 electoral college votes, 727k votes per elector
Texas - 29 million residents, 38 electoral college votes, 763k votes per elector
Florida - 21 million residents, 29 electoral college votes, 724k votes per elector
New York - 19 million residents, 29 electoral college votes, 655k votes per elector
Penn - 12.8 million residents, 20 electoral college votes, 640k votes per elector
Illinois - 12.7 million residents, 20 electoral college votes, 635k votes per elector
SMALLEST STATES
Wyoming - 577k residents, 3 electoral college votes, 192k votes per elector
Alaska - 731k residents, 3 electoral college votes, 243k votes per elector
North Dakota - 762k residents, 3 electoral college votes, 254k votes per elector
South Dakota - 884k residents, 3 electoral college votes, 294k votes per elector
Vermont - 623k residents, 3 electoral college votes, 207k votes per elector
Delaware - 973k residents, 3 electoral college votes, 324k votes per elector
Montana - 1 million residents, 3 electoral college votes, 333k votes per elector.
In the most extreme example, a vote in Wyoming holds about 3.5 times more weight than a vote in either California or Texas.