The correlation between income and vaccination rate was most stark in Peoria County, where the Dunlap zip code of 61525 had a full vaccination rate of 72.46 percent. Dunlap's median income is $103,344.
South Peoria's 61605, which has a median income of $19,442, had Peoria County's lowest full vaccination rate: 24.06 percent.
The second-lowest rate (26.72 percent) was in West Bluff's 61606, where the median income is $35,904.

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