610
- 61001 Apple River
- 61006 Ashton
- 61007 Baileyville
- 61008 Belvidere
- 61010 Byron
- 61011 Caledonia
- 61012 Capron
- 61013 Cedarville
- 61014 Chadwick
- 61015 Chana
- 61016 Cherry Valley
- 61018 Dakota
- 61019 Davis
- 61020 Davis Junction
- 61021 Dixon
- 61024 Durand
- 61025 East Dubuque
- 61027 Eleroy
- 61028 Elizabeth
- 61030 Forreston
- 61031 Franklin Grove
- 61032 Freeport
- 61036 Galena
- 61037 Galt
- 61038 Garden Prairie
- 61039 German Valley
- 61041 Hanover
- 61042 Harmon
- 61043 Holcomb
- 61044 Kent
- 61046 Lanark
- 61047 Leaf River
- 61048 Lena
- 61049 Lindenwood
- 61050 Mc Connell
- 61051 Milledgeville
- 61052 Monroe Center
- 61053 Mount Carroll
- 61054 Mount Morris
- 61057 Nachusa
- 61059 Nora
- 61060 Orangeville
- 61061 Oregon
- 61062 Pearl City
- 61063 Pecatonica
- 61064 Polo
- 61065 Poplar Grove
- 61067 Ridott
- 61068 Rochelle
- 61070 Rock City
- 61071 Rock Falls
- 61072 Rockton
- 61073 Roscoe
- 61074 Savanna
- 61075 Scales Mound
- 61077 Seward
- 61078 Shannon
- 61079 Shirland
- 61080 South Beloit
- 61081 Sterling
- 61084 Stillman Valley
- 61085 Stockton
- 61087 Warren
- 61088 Winnebago
- 61089 Winslow
- 61091 Woosung