First three digits · Missouri
ZIP Codes Starting with
55 ZIP codes start with 646, sorted at the Kansas City, MO (SCF 640) sectional center (USPS labeling list L005, effective October 1, 2026) in Missouri: 54 residential ZIP codes across 12 counties and 1 PO Box or single-organization code (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 646 mean?
The first digit, 6, is one of ten national areas (Illinois, Kansas, Missouri and Nebraska). The first three, 646, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 646 to the Kansas City, MO (SCF 640) facility. The last two digits pick the delivery area. By residents, the largest town names among the 646 ZIP codes are Chillicothe, Trenton, Brookfield, Carrollton, Marceline and Gallatin.
The same facility sorts 15 prefixes, 642 ZIP codes in all: 640, 641, 644, 645, 646, 647, 649, 660, 661, 662, 664, 665, 666, 667, 668.
Where are the 646 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 646
| County | ||||||
|---|---|---|---|---|---|---|
| 64601 | Chillicothe | Livingston County | 12,189 | 51 | $63k | $154k |
| 64620 | Altamont | Daviess County | 626 | 31 | $75k | $244k |
| 64622 | Bogard | Carroll County | 718 | 11 | $81k | $85k |
| 64623 | Bosworth | Carroll County | 464 | 7 | $53k | $66k |
| 64624 | Braymer | Caldwell County | 1,489 | 12 | $58k | $96k |
| 64625 | Breckenridge | Caldwell County | 738 | 11 | $35k | $64k |
| 64628 | Brookfield | Linn County | 5,661 | 38 | $59k | $124k |
| 64630 | Browning | Sullivan County | 495 | 5 | $58k | $148k |
| 64631 | Bucklin | Linn County | 836 | 9 | $60k | $110k |
| 64632 | Cainsville | Mercer County | 371 | 4 | $50k | $80k |
| 64633 | Carrollton | Carroll County | 4,346 | 18 | $59k | $128k |
| 64635 | Chula | Livingston County | 508 | 8 | $78k | $140k |
| 64636 | Coffey | Daviess County | 217 | 10 | $34k | $113k |
| 64637 | Cowgill | Caldwell County | 492 | 7 | $57k | $125k |
| 64638 | Dawn | Livingston County | 470 | 7 | $64k | $245k |
| 64639 | De Witt | Carroll County | 113 | 3 | $59k | $74k |
| 64640 | Gallatin | Daviess County | 3,125 | 22 | $61k | $194k |
| 64641 | Galt | Grundy County | 625 | 8 | $50k | $138k |
| 64642 | Gilman City | Harrison County | 804 | 7 | $64k | $95k |
| 64643 | Hale | Carroll County | 1,088 | 10 | $57k | $113k |
| 64644 | Hamilton | Caldwell County | 2,923 | 27 | $74k | $194k |
| 64645 | Harris | Sullivan County | 195 | 3 | $53k | – |
| 64646 | Humphreys | Sullivan County | 471 | 10 | $68k | – |
| 64647 | Jameson | Daviess County | 423 | 8 | $51k | $122k |
| 64648 | Jamesport | Daviess County | 2,396 | 21 | $75k | $108k |
| 64649 | Kidder | Caldwell County | 814 | 23 | $67k | $228k |
| 64650 | Kingston | Caldwell County | 665 | 16 | $45k | $203k |
| 64651 | Laclede | Linn County | 461 | 12 | $72k | $78k |
| 64652 | Laredo | Grundy County | 346 | 8 | $59k | $176k |
| 64653 | Linneus | Linn County | 431 | 5 | $55k | $108k |
| 64654 | Lock Springs | Daviess County | 49 | 505 | $97k | $122k |
| 64655 | Lucerne | Putnam County | 93 | 2 | – | – |
| 64656 | Ludlow | Livingston County | 237 | 11 | $58k | $107k |
| 64657 | McFall | Gentry County | 266 | 4 | $60k | $139k |
| 64658 | Marceline | Chariton County | 3,147 | 34 | $76k | $145k |
| 64659 | Meadville | Linn County | 793 | 12 | $74k | $143k |
| 64660 | Mendon | Chariton County | 444 | 5 | $80k | $219k |
| 64661 | Mercer | Mercer County | 757 | 8 | $54k | $74k |
| 64664 | Mooresville | Livingston County | 244 | 5 | $73k | $133k |
| 64667 | Newtown | Sullivan County | 255 | 3 | $48k | $90k |
| 64668 | Norborne | Carroll County | 1,278 | 8 | $74k | $120k |
| 64670 | Pattonsburg | Daviess County | 1,007 | 8 | $52k | $177k |
| 64671 | Polo | Caldwell County | 1,986 | 21 | $76k | $173k |
| 64672 | Powersville | Putnam County | 185 | 2 | $43k | – |
| 64673 | Princeton | Mercer County | 2,497 | 11 | $61k | $102k |
| 64674 | Purdin | Linn County | 409 | 6 | $70k | $116k |
| 64676 | Rothville | Chariton County | 132 | 6 | $60k | $85k |
| 64679 | Spickard | Grundy County | 921 | 10 | $54k | $118k |
| 64680 | Stet | Carroll County | PO Box or unique | – | – | – |
| 64681 | Sumner | Chariton County | 170 | 3 | $71k | $81k |
| 64682 | Tina | Carroll County | 411 | 11 | $55k | $120k |
| 64683 | Trenton | Grundy County | 7,631 | 33 | $52k | $110k |
| 64686 | Utica | Livingston County | 211 | 135 | $72k | $113k |
| 64688 | Wheeling | Livingston County | 705 | 11 | $68k | $133k |
| 64689 | Winston | Daviess County | 422 | 13 | $62k | $121k |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.