First three digits · Iowa
ZIP Codes Starting with
46 ZIP codes start with 520, sorted at the Cedar Rapids, IA (SCF 522) sectional center (USPS labeling list L005, effective October 1, 2026) in Iowa: 44 residential ZIP codes across 6 counties and 2 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 520 mean?
The first digit, 5, is one of ten national areas (Iowa, Minnesota, Montana, North Dakota, South Dakota and Wisconsin). The first three, 520, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 520 to the Cedar Rapids, IA (SCF 522) facility. The last two digits pick the delivery area. By residents, the largest town names among the 520 ZIP codes are Dubuque, Manchester, Maquoketa, Dyersville, Bellevue and Peosta.
The same facility sorts 4 prefixes, 163 ZIP codes in all: 520, 522, 523, 524.
Where are the 520 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 520
| County | ||||||
|---|---|---|---|---|---|---|
| 52001 | Dubuque | Dubuque County | 43,101 | 1,650 | $62k | $178k |
| 52002 | Dubuque | Dubuque County | 17,005 | 583 | $91k | $299k |
| 52003 | Dubuque | Dubuque County | 13,796 | 245 | $99k | $286k |
| 52004 | Dubuque | Dubuque County | PO Box or unique | – | – | – |
| 52030 | Andrew | Jackson County | 423 | 1,706 | $66k | $121k |
| 52031 | Bellevue | Jackson County | 5,403 | 32 | $87k | $245k |
| 52032 | Bernard | Dubuque County | 1,305 | 13 | $89k | $269k |
| 52033 | Cascade | Jones County | 3,292 | 33 | $69k | $214k |
| 52035 | Colesburg | Clayton County | 1,331 | 27 | $62k | $139k |
| 52036 | Delaware | Delaware County | 135 | 315 | $85k | $144k |
| 52037 | Delmar | Clinton County | 1,172 | 17 | $91k | $198k |
| 52038 | Dundee | Delaware County | 463 | 17 | $56k | $165k |
| 52039 | Durango | Dubuque County | 1,079 | 31 | $79k | $331k |
| 52040 | Dyersville | Delaware County | 5,584 | 90 | $85k | $242k |
| 52041 | Earlville | Delaware County | 1,468 | 25 | $90k | $189k |
| 52042 | Edgewood | Clayton County | 1,804 | 30 | $96k | $234k |
| 52043 | Elkader | Clayton County | 2,058 | 21 | $77k | $165k |
| 52044 | Elkport | Clayton County | 297 | 23 | $76k | $97k |
| 52045 | Epworth | Dubuque County | 2,777 | 58 | $92k | $264k |
| 52046 | Farley | Dubuque County | 3,129 | 65 | $96k | $274k |
| 52047 | Farmersburg | Clayton County | 462 | 12 | $59k | $96k |
| 52048 | Garber | Clayton County | 201 | 6 | $57k | $66k |
| 52049 | Garnavillo | Clayton County | 1,370 | 20 | $62k | $171k |
| 52050 | Greeley | Delaware County | 422 | 13 | $67k | $232k |
| 52052 | Guttenberg | Clayton County | 2,999 | 33 | $62k | $197k |
| 52053 | Holy Cross | Dubuque County | 1,148 | 20 | $83k | $252k |
| 52054 | La Motte | Jackson County | 794 | 14 | $104k | $225k |
| 52056 | Luxemburg | Dubuque County | 229 | 485 | $84k | $183k |
| 52057 | Manchester | Delaware County | 8,193 | 59 | $70k | $184k |
| 52060 | Maquoketa | Jackson County | 8,007 | 50 | $68k | $158k |
| 52064 | Miles | Jackson County | 685 | 16 | $75k | $140k |
| 52065 | New Vienna | Dubuque County | 671 | 14 | $99k | $219k |
| 52066 | North Buena Vista | Clayton County | 124 | 46 | $52k | $104k |
| 52068 | Peosta | Dubuque County | 5,280 | 122 | $126k | $362k |
| 52069 | Preston | Jackson County | 1,743 | 36 | $75k | $170k |
| 52070 | Sabula | Jackson County | 990 | 21 | $79k | $173k |
| 52071 | Saint Donatus | Jackson County | 135 | 313 | $44k | $203k |
| 52072 | Saint Olaf | Clayton County | 454 | 14 | $62k | $121k |
| 52073 | Sherrill | Dubuque County | 1,381 | 29 | $96k | $297k |
| 52074 | Spragueville | Jackson County | 119 | 4 | $86k | $119k |
| 52075 | Springbrook | Jackson County | 125 | 208 | $54k | $151k |
| 52076 | Strawberry Point | Clayton County | 2,258 | 22 | $73k | $151k |
| 52077 | Volga | Clayton County | 313 | 10 | $77k | – |
| 52078 | Worthington | Dubuque County | 870 | 21 | $98k | $238k |
| 52079 | Zwingle | Jackson County | 995 | 17 | $101k | $238k |
| 52099 | Dubuque | Dubuque 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.