DeKalb County, Illinois ZIP Codes

Zip Code
City
Population ↓
60115Dekalb42,536
60178Sycamore22,224
60548Sandwich11,721
60135Genoa7,274
60112Cortland4,621
60552Somonauk4,285
60520Hinckley2,979
60145Kingston2,464
60146Kirkland2,369
60556Waterman2,138
60150Malta1,738
60550Shabbona941
60111Clare257

Overview of ZIP Codes in DeKalb County

ZCTAs are geographic areas created by the US Census Bureau to approximate the delivery areas of ZIP Codes for statistical analysis. While ZCTAs use the same five-digit codes as ZIP Codes, they represent defined geographic areas that may not exactly match the mail delivery routes of ZIP Codes.
13
ZIP Codes

The data shown reflect ZCTAs from the US Census. As of 2025, there are 13 ZCTAs in DeKalb County, Illinois (US Census).

Sources

  1. US Census: 2025 Gazetteer Files
  2. US Census: ZIP Code Tabulation Areas (ZCTAs)

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