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Post Offices in Illinois

1,426 post offices in 1,142 cities and 102 counties · Data as of 09/23/2026

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Post offices in Illinois at a glance

  • Illinois has 1,426 post offices, about 1.1 for every 10,000 residents.
  • Per person, that is 38% above the national rate (0.81 per 10,000).
  • It ranks 3rd among the states by number of post offices.
  • Chicago (74), Peoria (6) and Springfield (6) have the most, 6% of the state total combined.

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All post offices in Illinois

1,426 listed, A to Z · Page 1 of 48

Frequently asked questions

How many post offices are in Illinois?
There are 1,426 post offices in Illinois in our data as of 09/23/2026.
Which Illinois cities have the most post offices?
Chicago (74), Peoria (6), Springfield (6), Alton (5), Rockford (5).