First three digits · Illinois
ZIP Codes Starting with
47 ZIP codes start with 612, sorted at the Quad Cities, IL (SCF 612) sectional center (USPS labeling list L005, effective October 1, 2026) in Illinois: 44 residential ZIP codes across 5 counties and 3 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 612 mean?
The first digit, 6, is one of ten national areas (Illinois, Kansas, Missouri and Nebraska). The first three, 612, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 612 to the Quad Cities, IL (SCF 612) facility. The last two digits pick the delivery area. By residents, the largest town names among the 612 ZIP codes are Moline, Rock Island, East Moline, Geneseo, Milan and Silvis.
The same facility sorts 4 prefixes, 139 ZIP codes in all: 526, 527, 528, 612.
Where are the 612 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 612
| County | ||||||
|---|---|---|---|---|---|---|
| 61201 | Rock Island | Rock Island County | 36,766 | 2,057 | $59k | $126k |
| 61204 | Rock Island | Rock Island County | PO Box or unique | – | – | – |
| 61230 | Albany | Whiteside County | 1,039 | 54 | $62k | $139k |
| 61231 | Aledo | Mercer County | 4,962 | 32 | $71k | $148k |
| 61232 | Andalusia | Rock Island County | 1,469 | 455 | $74k | $186k |
| 61233 | Andover | Henry County | 281 | 391 | $72k | $183k |
| 61234 | Annawan | Henry County | 1,116 | 20 | $80k | $147k |
| 61235 | Atkinson | Henry County | 1,283 | 24 | $62k | $133k |
| 61236 | Barstow | Rock Island County | 34 | 42 | $78k | $159k |
| 61237 | Buffalo Prairie | Rock Island County | no residents | 0 | – | – |
| 61238 | Cambridge | Henry County | 2,549 | 25 | $65k | $131k |
| 61239 | Carbon Cliff | Rock Island County | 1,189 | 1,503 | $32k | $99k |
| 61240 | Coal Valley | Rock Island County | 5,795 | 159 | $113k | $237k |
| 61241 | Colona | Henry County | 6,587 | 345 | $80k | $166k |
| 61242 | Cordova | Rock Island County | 1,135 | 36 | $104k | $218k |
| 61243 | Deer Grove | Whiteside County | 155 | 6 | $148k | $173k |
| 61244 | East Moline | Rock Island County | 23,308 | 865 | $64k | $139k |
| 61250 | Erie | Whiteside County | 2,781 | 32 | $85k | $168k |
| 61251 | Fenton | Whiteside County | 377 | 21 | $80k | $191k |
| 61252 | Fulton | Whiteside County | 5,437 | 93 | $60k | $142k |
| 61254 | Geneseo | Henry County | 12,135 | 73 | $92k | $223k |
| 61256 | Hampton | Rock Island County | 1,926 | 1,298 | $90k | $185k |
| 61257 | Hillsdale | Rock Island County | 844 | 20 | $64k | $117k |
| 61258 | Hooppole | Henry County | 182 | 489 | $44k | $75k |
| 61259 | Illinois City | Rock Island County | 1,053 | 14 | $92k | $201k |
| 61260 | Joy | Mercer County | 737 | 13 | $42k | $97k |
| 61261 | Lyndon | Whiteside County | 656 | 40 | $64k | $134k |
| 61262 | Lynn Center | Henry County | 1,197 | 23 | $86k | $245k |
| 61263 | Matherville | Mercer County | 657 | 481 | $87k | $135k |
| 61264 | Milan | Rock Island County | 10,073 | 146 | $78k | $153k |
| 61265 | Moline | Rock Island County | 43,748 | 2,276 | $67k | $147k |
| 61266 | Moline | Rock Island County | PO Box or unique | – | – | – |
| 61270 | Morrison | Whiteside County | 6,912 | 46 | $81k | $165k |
| 61272 | New Boston | Mercer County | 1,437 | 16 | $64k | $146k |
| 61273 | Orion | Henry County | 3,120 | 68 | $99k | $187k |
| 61274 | Osco | Henry County | 197 | 8 | $72k | $129k |
| 61275 | Port Byron | Rock Island County | 4,253 | 128 | $108k | $246k |
| 61276 | Preemption | Mercer County | 88 | 260 | $88k | $89k |
| 61277 | Prophetstown | Whiteside County | 3,054 | 23 | $70k | $148k |
| 61278 | Rapids City | Rock Island County | 678 | 437 | $70k | $219k |
| 61279 | Reynolds | Mercer County | 1,015 | 26 | $88k | $162k |
| 61281 | Sherrard | Mercer County | 2,520 | 63 | $103k | $224k |
| 61282 | Silvis | Rock Island County | 8,394 | 2,672 | $64k | $160k |
| 61283 | Tampico | Whiteside County | 1,269 | 15 | $64k | $122k |
| 61284 | Taylor Ridge | Rock Island County | 2,599 | 59 | $101k | $237k |
| 61285 | Thomson | Carroll County | 2,728 | 61 | $69k | $173k |
| 61299 | Rock Island | Rock Island County | PO Box or unique | – | – | – |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.