First three digits · Illinois
ZIP Codes Starting with
66 ZIP codes start with 610, sorted at the Palatine, IL (SCF 600) sectional center (USPS labeling list L005, effective October 1, 2026) in Illinois: 66 residential ZIP codes across 8 counties (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 610 mean?
The first digit, 6, is one of ten national areas (Illinois, Kansas, Missouri and Nebraska). The first three, 610, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 610 to the Palatine, IL (SCF 600) facility. The last two digits pick the delivery area. By residents, the largest town names among the 610 ZIP codes are Belvidere, Freeport, Dixon, Sterling, Roscoe and Rochelle.
The same facility sorts 4 prefixes, 173 ZIP codes in all: 600, 602, 610, 611.
Where are the 610 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 610
| County | ||||||
|---|---|---|---|---|---|---|
| 61001 | Apple River | Jo Daviess County | 1,226 | 31 | $78k | $300k |
| 61006 | Ashton | Lee County | 1,541 | 22 | $76k | $156k |
| 61007 | Baileyville | Ogle County | 196 | 8 | – | – |
| 61008 | Belvidere | Boone County | 33,582 | 398 | $77k | $196k |
| 61010 | Byron | Ogle County | 7,497 | 196 | $94k | $235k |
| 61011 | Caledonia | Boone County | 2,676 | 69 | $127k | $312k |
| 61012 | Capron | Boone County | 2,264 | 63 | $99k | $172k |
| 61013 | Cedarville | Stephenson County | 690 | 1,468 | $68k | $126k |
| 61014 | Chadwick | Carroll County | 1,067 | 17 | $69k | $104k |
| 61015 | Chana | Ogle County | 901 | 23 | $98k | $193k |
| 61016 | Cherry Valley | Winnebago County | 5,465 | 193 | $85k | $231k |
| 61018 | Dakota | Stephenson County | 1,034 | 31 | $77k | $158k |
| 61019 | Davis | Stephenson County | 3,461 | 93 | $105k | $232k |
| 61020 | Davis Junction | Ogle County | 3,149 | 100 | $106k | $203k |
| 61021 | Dixon | Lee County | 22,308 | 149 | $69k | $149k |
| 61024 | Durand | Winnebago County | 2,318 | 39 | $71k | $153k |
| 61025 | East Dubuque | Jo Daviess County | 4,294 | 121 | $71k | $198k |
| 61027 | Eleroy | Stephenson County | 33 | 65 | – | – |
| 61028 | Elizabeth | Jo Daviess County | 1,683 | 15 | $86k | $174k |
| 61030 | Forreston | Ogle County | 2,194 | 36 | $72k | $157k |
| 61031 | Franklin Grove | Lee County | 1,492 | 33 | $75k | $137k |
| 61032 | Freeport | Stephenson County | 29,020 | 195 | $57k | $112k |
| 61036 | Galena | Jo Daviess County | 7,121 | 74 | $82k | $279k |
| 61037 | Galt | Whiteside County | 145 | 1,066 | $70k | $104k |
| 61038 | Garden Prairie | Boone County | 1,274 | 30 | $105k | $282k |
| 61039 | German Valley | Stephenson County | 824 | 29 | $84k | $181k |
| 61041 | Hanover | Jo Daviess County | 1,338 | 17 | $46k | $115k |
| 61042 | Harmon | Lee County | 404 | 6 | $71k | $154k |
| 61043 | Holcomb | Ogle County | 143 | 298 | $69k | $124k |
| 61044 | Kent | Stephenson County | 225 | 17 | $82k | $150k |
| 61046 | Lanark | Carroll County | 2,794 | 33 | $79k | $167k |
| 61047 | Leaf River | Ogle County | 1,622 | 24 | $86k | $242k |
| 61048 | Lena | Stephenson County | 3,786 | 46 | $83k | $167k |
| 61049 | Lindenwood | Ogle County | 579 | 28 | $92k | $178k |
| 61050 | McConnell | Stephenson County | 199 | 19 | $75k | $124k |
| 61051 | Milledgeville | Carroll County | 1,469 | 29 | $60k | $104k |
| 61052 | Monroe Center | Ogle County | 1,145 | 41 | $92k | $226k |
| 61053 | Mount Carroll | Carroll County | 2,590 | 24 | $62k | $107k |
| 61054 | Mount Morris | Ogle County | 3,610 | 86 | $48k | $121k |
| 61057 | Nachusa | Lee County | 30 | 47 | – | – |
| 61059 | Nora | Jo Daviess County | 178 | 156 | $54k | $92k |
| 61060 | Orangeville | Stephenson County | 1,554 | 42 | $77k | $161k |
| 61061 | Oregon | Ogle County | 6,766 | 64 | $88k | $196k |
| 61062 | Pearl City | Stephenson County | 1,840 | 25 | $67k | $197k |
| 61063 | Pecatonica | Winnebago County | 4,011 | 54 | $84k | $174k |
| 61064 | Polo | Ogle County | 3,757 | 35 | $75k | $164k |
| 61065 | Poplar Grove | Boone County | 10,570 | 208 | $97k | $217k |
| 61067 | Ridott | Stephenson County | 450 | 14 | $67k | $171k |
| 61068 | Rochelle | Ogle County | 14,788 | 123 | $73k | $171k |
| 61070 | Rock City | Stephenson County | 1,322 | 41 | $84k | $157k |
| 61071 | Rock Falls | Whiteside County | 13,581 | 187 | $61k | $102k |
| 61072 | Rockton | Winnebago County | 11,285 | 216 | $105k | $238k |
| 61073 | Roscoe | Winnebago County | 20,194 | 723 | $102k | $239k |
| 61074 | Savanna | Carroll County | 3,962 | 54 | $51k | $92k |
| 61075 | Scales Mound | Jo Daviess County | 986 | 19 | $76k | $226k |
| 61077 | Seward | Winnebago County | 97 | 122 | – | – |
| 61078 | Shannon | Carroll County | 1,459 | 26 | $76k | $133k |
| 61079 | Shirland | Winnebago County | 210 | 54 | $46k | $123k |
| 61080 | South Beloit | Winnebago County | 10,955 | 437 | $77k | $181k |
| 61081 | Sterling | Whiteside County | 20,844 | 168 | $68k | $123k |
| 61084 | Stillman Valley | Ogle County | 3,201 | 92 | $103k | $214k |
| 61085 | Stockton | Jo Daviess County | 3,149 | 25 | $60k | $131k |
| 61087 | Warren | Jo Daviess County | 1,588 | 58 | $77k | $109k |
| 61088 | Winnebago | Winnebago County | 6,167 | 109 | $98k | $209k |
| 61089 | Winslow | Stephenson County | 526 | 12 | $66k | $116k |
| 61091 | Woosung | Ogle County | 248 | 98 | – | – |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.