First three digits · Iowa
ZIP Codes Starting with
21 ZIP codes start with 516, sorted at the Omaha, NE (SCF 680) sectional center (USPS labeling list L005, effective October 1, 2026) in Iowa: 20 residential ZIP codes across 3 counties and 1 PO Box or single-organization code (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 516 mean?
The first digit, 5, is one of ten national areas (Iowa, Minnesota, Montana, North Dakota, South Dakota and Wisconsin). The first three, 516, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 516 to the Omaha, NE (SCF 680) facility. The last two digits pick the delivery area. By residents, the largest town names among the 516 ZIP codes are Clarinda, Shenandoah, Sidney, Tabor, Hamburg and Essex.
The same facility sorts 6 prefixes, 306 ZIP codes in all: 515, 516, 680, 681, 686, 687.
Where are the 516 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 516
| County | ||||||
|---|---|---|---|---|---|---|
| 51601 | Shenandoah | Page County | 5,629 | 55 | $62k | $124k |
| 51603 | Shenandoah | Page County | PO Box or unique | – | – | – |
| 51630 | Blanchard | Page County | 160 | 6 | $70k | $189k |
| 51631 | Braddyville | Page County | 324 | 8 | $55k | $154k |
| 51632 | Clarinda | Page County | 6,624 | 31 | $55k | $143k |
| 51636 | Coin | Page County | 455 | 8 | $64k | $122k |
| 51637 | College Springs | Page County | 171 | 137 | $73k | $76k |
| 51638 | Essex | Page County | 1,258 | 16 | $59k | $121k |
| 51639 | Farragut | Fremont County | 919 | 13 | $85k | $157k |
| 51640 | Hamburg | Fremont County | 1,381 | 12 | $65k | $123k |
| 51645 | Imogene | Fremont County | 419 | 9 | $218k | – |
| 51646 | New Market | Taylor County | 767 | 14 | $74k | $120k |
| 51647 | Northboro | Page County | 172 | 7 | $24k | – |
| 51648 | Percival | Fremont County | 257 | 4 | $60k | $164k |
| 51649 | Randolph | Fremont County | 346 | 8 | $58k | $101k |
| 51650 | Riverton | Fremont County | 197 | 6 | $49k | $54k |
| 51651 | Shambaugh | Page County | 103 | 440 | $63k | $64k |
| 51652 | Sidney | Fremont County | 1,569 | 21 | $82k | $135k |
| 51653 | Tabor | Fremont County | 1,446 | 41 | $71k | $230k |
| 51654 | Thurman | Fremont County | 325 | 7 | $90k | $232k |
| 51656 | Yorktown | Page County | 57 | 210 | $84k | $76k |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.