County ZIP codes · Illinois · FIPS 17087

Johnson County, IL ZIP Codes

Johnson County, Illinois has 11 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 10 residential and 1 for PO boxes or a single organization. 7 of the residential ones lie mainly in Johnson County and 3 mainly in a neighboring county; 9 cross the county line. Median household income ranges from $63,750 in 62912 (Buncombe) to $84,175 in 62972 (Ozark) (Census Bureau, ACS 2020-2024).

ACS2020-24
Census2020

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

62912 · $64k 62972 · $84k

The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $63,750 and $74,245.

They carry 10 postal town names.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 10 residential ZIP codes in Johnson County

7 ZIP codes lie mainly in Johnson County; 3 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Johnson County, largest first; "In this county" is the share of the ZIP's land in the county
						In this county
62995	Vienna	6,339	53	$50k	$155k	100%
62939	Goreville	2,958	66	$66k	$173k	90%
62912	Buncombe	1,515	29	$64k	$109k	59%
62972	Ozark	1,056	20	$84k	$189k	91%
62923	Cypress	441	19	$52k	$79k	60%
62943	Grantsburg	428	11	$83k	$139k	61%
62967	New Burnside	309	47	$62k	$117k	96%

Partly in Johnson County

Residential ZIP codes mainly in another county that reach at least 1% into Johnson County, by their share here
						In this county
62985	Simpson	1,128	15	$74k	$184k	36%
62908	Belknap	440	9	$90k	$161k	35%
62922	Creal Springs	2,608	41	$74k	$175k	27%

Download the 11 ZIP codes as CSV

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?

9 ZIP codes of Johnson County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Johnson County and in the neighboring counties
ZIP	In Johnson	Elsewhere
62939	90%	Union County 6%; Williamson County 4%
62922	27%	Williamson County 73%
62912	59%	Union County 41%
62985	36%	Pope County 64%
62972	91%	Pope County 9%
62923	60%	Union County 22%; Pulaski County 18%
62908	35%	Massac County 65%
62943	61%	Massac County 24%; Pope County 15%
62967	96%	Williamson County 4%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

PO Box and single-organization ZIP codes

ZIP codes in Johnson County without a residential area (GeoNames postal codes)
ZIP	Postal name
62909	Boles

Source: GeoNames postal codes (CC BY 4.0).

Which first three digits do Johnson 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 Johnson County starts with 629.

Three-digit prefixes of Johnson County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Johnson County's
Prefix	Sectional center	Here	All codes
629	St Louis, MO (SCF 630)	11	83

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.

Where are the ZIP codes of Johnson County?