County ZIP codes · Illinois · FIPS 17001
Adams County, IL ZIP Codes
Adams County, Illinois has 24 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 23 residential and 1 for PO boxes or a single organization. 16 of the residential ones lie mainly in Adams County and 7 mainly in a neighboring county; 11 cross the county line. Median household income ranges from $52,055 in 62301 (Quincy) to $93,810 in 62347 (Liberty) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Adams County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $54,706 and $83,598.
They carry 22 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 23 residential ZIP codes in Adams County
16 ZIP codes lie mainly in Adams County; 7 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 62301 | Quincy | 30,746 | 2,753 | $52k | $135k | 100% |
| 62305 | Quincy | 19,036 | 137 | $84k | $214k | 100% |
| 62320 | Camp Point | 2,667 | 33 | $77k | $167k | 100% |
| 62347 | Liberty | 1,977 | 17 | $94k | $226k | 100% |
| 62351 | Mendon | 1,928 | 26 | $77k | $148k | 95% |
| 62360 | Payson | 1,605 | 43 | $55k | $148k | 100% |
| 62376 | Ursa | 1,276 | 20 | $58k | $178k | 100% |
| 62324 | Clayton | 1,196 | 13 | $77k | $97k | 93% |
| 62338 | Fowler | 1,075 | 31 | $92k | $227k | 100% |
| 62339 | Golden | 970 | 35 | $62k | $126k | 100% |
| 62349 | Loraine | 517 | 11 | $68k | $88k | 91% |
| 62325 | Coatsburg | 465 | 25 | $76k | $155k | 100% |
| 62365 | Plainville | 464 | 17 | $91k | $163k | 100% |
| 62348 | Lima | 204 | 84 | $78k | $88k | 100% |
| 62359 | Paloma | 184 | 53 | $51k | – | 100% |
| 62346 | La Prairie | 164 | 4 | – | $127k | 62% |
Partly in Adams County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 62312 | Barry | 1,931 | 21 | $69k | $98k | 22% |
| 62379 | Warsaw | 1,854 | 19 | $62k | $103k | 20% |
| 62314 | Baylis | 530 | 8 | $76k | $160k | 15% |
| 62311 | Augusta | 872 | 18 | $48k | $101k | 12% |
| 62316 | Bowen | 705 | 16 | $61k | $84k | 11% |
| 62343 | Hull | 611 | 8 | $61k | $95k | 6% |
| 62373 | Sutter | 225 | 5 | $111k | $140k | 3% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
11 ZIP codes of Adams County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Adams | Elsewhere |
|---|---|---|
| 62312 | 22% | Pike County78% |
| 62351 | 95% | Hancock County5% |
| 62379 | 20% | Hancock County80% |
| 62324 | 93% | Brown County7% |
| 62311 | 12% | Hancock County49%; Schuyler County40% |
| 62316 | 11% | Hancock County89% |
| 62343 | 6% | Pike County94% |
| 62314 | 15% | Pike County85% |
| 62349 | 91% | Hancock County9% |
| 62373 | 3% | Hancock County97% |
| 62346 | 62% | Schuyler County38% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 62306 | Quincy |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Adams County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Adams County starts with 623.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 623 | Springfield, IL (SCF 625) | 24 | 54 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.